"My girlfriend can eat this": a French mini version that brought America's Fig to France
What it is A French dietary restriction scanner app: scan a product barcode to see if you can eat it, and find restaurants by restriction. Families can each have a profile. After a 7-day trial, it's a monthly or yearly subscription.
Why it took off The founders' own TikTok account has posted videos every day since Oct 17 like "the 3 most dangerous foods in pregnancy" and "cooking for my girlfriend with PCOS." A few videos with tens of thousands of views drove a weekly install spike. And France had no Fig-style app covering every restriction.
BHow you could follow Build local versions for large languages Fig hasn't entered (German, Spanish, Italian), starting the product catalog from Open Food Facts. First, get only pregnancy, PCOS, and celiac right. Then launch a real persona account posting daily in three formats: "I cook what she can eat," "3 dangerous foods," and "essential apps."
- Data (updated daily) · first launch 2026-08-27 · 11-07 installs 2,645
Android · Total installs worldwide Data 2026-10-29 → 2026-11-07 (10 days, 10 observations). Google's detail page only refreshes install counts every other day, so a flat day doesn't mean nobody installed.
France's Zest is an app where you scan a barcode to check "can I eat this," backed by a TikTok account that makes its own content. It's still small, with 2,645 total installs on Google Play, and this wave is already fading. What's worth watching is the approach: take a subscription app already validated in the US but not yet in France, make a French version, then use a persona account of "boyfriend cooking for a girlfriend with a condition" to rotate through what people with different conditions can eat, pulling them into the same app.
A supermarket video with 430k views
In 2026 Jul 30, the TikTok account @brothers.diet posted a video titled "Trouver ce que ma copine ✨peut✨ manger avec #sopk," meaning "Find what my girlfriend with PCOS can eat." By Nov 6 it had 433k views, and the follow-up two days later, "Planning a dinner my PCOS girlfriend can eat," had 303k.
The most-liked comment was someone asking why there are shrimp chips in the fridge. Scrolling further, the same question showed up a dozen times: "C'est quoi l'appli ?" (What's the app?), "c'est quoi l'app? j'en aurais besoin j'ai le SOPK..." (I have PCOS too, I need it), "je veux l'application svp" (I want the app please). Someone also asked "Don't you have to label commercial TikToks?" and two or three said "too bad it's paid."
The app being asked about is called Zest. The account bio reads "Ce que tu ✨peux✨ manger" (what you can eat), with a link to zestzerostress.com that redirects straight to Zest's Google Play page. Zest's Android version launched in Aug 27.
What it is
A French dietary restriction scanner app. You choose your restrictions in the app, then scan product barcodes in the supermarket and it tells you whether it's safe, risky, or to be avoided. It can also find restaurants by restriction. The store page says it covers 3,000 restrictions: allergies, lactose intolerance, celiac disease, diabetes, pregnancy, PCOS, halal, and vegetarian. Families can each create a profile. After downloading you get 7 days free, then a subscription of €9.99/month or €49.99/year.
The developer is listed as Noam Rivet, based in Essonne, south of Paris. The company on the payment page is My Star LLC. The iOS version launched in 2026 February under the name Allerfy and was only later renamed Zest (from "Zéro stress à table," zero stress at the table). The support contact email still uses the allerfy domain.
The model it copies is obvious: America's Fig (Food Is Good). Fig also says it supports "every" dietary restriction (2,800 of them), also helps you "find food you CAN eat," also has multiple profiles and restaurants, and its yearly fee is around $50. Fig has 850k installs on Google Play, but it can't be found in the French App Store, and its product catalog is built on US supermarkets. Zest is essentially a French Fig.
How big it is and when it took off
Not big. Putting the numbers together:
| Date | Play cumulative installs | Play, France, Health free chart | iOS, France, Health free chart |
|---|---|---|---|
| 10-28 | — | — | 59 |
| 10-29 | 947 | 118 | — |
| 10-31 | 1,498 | 113 | — |
| 11-02 | 2,134 | 90 | — |
| 11-03 | 2,346 | 82 | 21 |
| 11-06 | 2,645 | 120 | 47 |
(Google Play installs and the Health free charts on both stores, daily records from 10-28 to 11-06.)
In late October, Play added about 60 installs a day. By late October to early November, that rose to about 300 a day. On 3 Nov both stores hit their peak ranking on the same day, then daily new installs fell back to about 100. On iOS France, the rating count rose from 10-28 to 16 and then 11-06 to 24, with an average of 4.5. France has many iPhone users, and iOS climbed to #21 on the Health chart, so iOS downloads were probably higher than Play's (inference). It isn't on either store's grossing chart, and its revenue is not visible from outside.
How users came in
It came almost entirely from that TikTok account.
@brothers.diet has 1,185 followers and 33.7k likes on 11-06. After the two July videos took off, the account went quiet for over two months (either it stopped posting or it deleted posts). From Oct 17 it restarted, posting 1 to 3 videos a day, and by Nov 6 it had posted about 38 in total. It uses three formats, and it keeps rotating them:
- "I cook what Y can eat for my X girlfriend/wife": 10-17 "Mac and cheese for my pregnant wife" 98k views, 10-19 "Gluten-free gnocchi for my celiac girlfriend" 34k.
- "The 3 most dangerous foods when you have X": 10-28 "The 3 dangerous foods for pregnant women" 69k, 10-31 "The 3 dangerous foods in pregnancy (the last one causes toxoplasmosis)" 69k, 10-25 "Pregnant women, watch out for listeria" 42k, 10-24 "The 3 dangerous foods PCOS girls don't know about" 24k.
- "Essential apps for X people": 10-21 "The 4 essential apps for pregnancy" 32k, with Zest among them. In 11-01 the video says it outright: "Pour savoir quoi manger, l'app c'est Zest 🍋" (To know what to eat, the app is Zest).
The topics moved from allergies to pregnancy, PCOS, endometriosis, hormonal acne, and anti-inflammatory weight loss. The app covers 3,000 restrictions, so every topic can land on the same app. In Oct 23 the app also shipped a new version that adds "analyze recipes you see on social networks," so people who come across a video can open the app right away.
The timing lines up well: pregnancy videos ran 10-25 to 10-31 with several at 4 to 70K views on TikTok, and Play daily installs hit about 300,11-03 between 10-30 and 11-02, with both charts peaking the same day. From Nov 3 onward, most videos fell back to a few hundred views (the best one, "pregnancy 10/10 foods", reached 7,444 on 11-06), and installs dropped off with them. The YouTube Shorts account with the same name is a TikTok repost, mostly a few hundred views. There is also an Instagram account that ran partnerships with a digestive enzyme brand and a cooking course from 7 to September; its follower count is unclear. Meta and TikTok ad libraries show no ads from it, but that doesn't mean it didn't run any. No media coverage, and zero mentions on X.
Where the money comes from
After the 7-day trial you have to pay or you lose access, and there's no free tier. The most-liked comment on Play is one word: "Payant." (Paid.) TikTok comments show the same reaction: lots of people want it, and plenty are disappointed to learn it costs money.
Whether it makes money shows up clearly in a rival of the same niche. BellySafe in France only handles food safety during pregnancy (scanning products, photographing dishes and menus). It has just 55 ratings on the French iOS store yet ranks #11 to #16 on the Top Grossing health chart. Its TikTok also runs "3 apps I kept during my 7 months of pregnancy," the same format as Zest. So in France, people will pay to ease pregnancy food anxiety. Zest is riding that traffic, but its own revenue isn't visible yet.
Who it's competing with
- Yuka: the scanner app nearly everyone in France has installed (43.9M Play installs, 296k ratings on the French iOS store). It focuses on nutrition scores and additive ratings. Its paid version only flags a few things like gluten, lactose, pork and vegan, and doesn't handle combinations of allergies, family profiles or restaurants.
- Fig: the prototype, not listed in France. If it ever launches there, Zest has no moat to stop it.
- BellySafe: pregnancy only, and it monetizes better than Zest.
- Open Food Facts: a free, open-source product database that can flag 14 allergens but makes no personal judgments. It has data for every country, so anyone building a product database can start here (I couldn't confirm whether Zest uses it).
- Small French allergy apps (Allergenius, Codiz, Allergo, NutriAllergie, etc.): similar features, all under 20 ratings on the French iOS store, no content marketing, none of them took off.
So the product itself has no moat. Zest's features are close to those small French apps; its edge is a account posting videos every day. In 3 the iOS reviews still had two one-star ratings, one saying "unreliable, it sent me to the hospital," another before the rename reading "Allerfy est une appli dangereuse." For an app that tells people "you can eat this," accuracy is the biggest risk.
If it were you
B. The playbook can be copied, but Zest hasn't proven it makes money: it's small, this wave is fading, revenue is invisible, and its data accuracy has drawn complaints. What's worth learning is the combination: a vertical subscription app already proven in the US, plus a language nobody has taken, plus a persona content account run by the founders.
Who it suits: 1 to 2 people, one who can post daily on camera and whose native language is German, Spanish or Italian (languages Fig doesn't cover); another who can build a clean local product database. Ideally you have a real family member with dietary restrictions, so the persona doesn't feel fake.
Who it doesn't suit: people who won't film videos every day and just want to list and wait for organic traffic (the French allergy apps that skipped content are the proof); people who want the English market (Fig is there, along with a crowd of rivals); people who can't handle the liability risk of health-related products.
How to do it: pick a large language Fig hasn't entered, start the product database from that country's Open Food Facts data, and add local supermarket store brands. Don't launch 3,000 restrictions at once: start accurate with three groups (pregnancy, PCOS, celiac) and write "for reference only" on the results page. Offer a 7-day trial plus an annual subscription, priced in line with Fig; keep a free tier with a few scans, since "paywall" is the most common complaint in Zest's reviews.
How to get users: run a persona account and post daily in the three formats above: "I cook for her with X," "3 dangerous foods when you have X," "3 apps everyone with X needs." Pregnancy topics spread fastest, PCOS is next. Put the app link in the bio and reply in comments when people ask "what app is that." If your market requires commercial content to be labeled, label it; people are already asking in the comments.
When to move: the sooner the better. Get one traffic cycle in before 2027 March. Watch two things then: whether Fig opens a European store, and whether single-audience apps like BellySafe expand outward.
Signs you've read this wrong: (1) by 2027 January, Zest's Play installs are still below 10k and it has dropped out of the French iOS health chart top 100, meaning the persona account only brought a short spike that didn't stick; (2) Fig launches a French or German version; (3) you post daily for 30 days and views stay in the hundreds, none passing 50k. Pregnancy going viral in France doesn't mean it will go viral in your language.
Research notes: competitor table, acquisition evidence, full research report
- Competitors
Name Where Launched Scale How it differs from this one Yuka iOS 2017 43.9M global Play installs; 296k ratings on French iOS Yuka focuses on nutrition and additive scores; Premium only flags a few things like gluten, lactose and palm oil. Zest handles combinations of 3000+ restrictions, multiple family profiles and restaurants Fig: Food Scanner iOS 2021 850k Play installs, claims 1M+ members Zest's prototype, with nearly identical features, copy and pricing. But Fig isn't on the French App Store and its product database is American. Zest is its French version BellySafe – Manger serein iOS 2026-02 Ranked #11–16 on the French iOS health Top Grossing chart, 55 ratings; 5,680 Play installs Covers only pregnancy food safety. Zest covers all restrictions, but borrows the pregnancy anxiety traffic that BellySafe has already validated on TikTok Open Food Facts Open source 2012 Play 2.94M installs A free general database that flags 14 allergens; no personalized judgments or restaurants Gluten Free Scanner Android 2022 390k Play installs; #48 on the French iOS health Top Grossing chart Gluten-free only Small French allergy scanner apps: Allergenius / Codiz / Allergo / NutriAllergie, etc. iOS 2016–2026 Each under 20 ratings on the French store Similar features, but no content marketing, no family profiles or restaurants Spokin / AllergyEats / Find Me Gluten Free Other 2010–2020 FMGF has 1.53M Play installs Allergy-friendly restaurant reviews, US-leaning, weak coverage in France - Where users come from
- Verified Self-run TikTok persona @brothers.diet (a boyfriend/husband cooking for a girlfriend with dietary restrictions, plus a list of risky foods and a list of must-have apps): bio links to zestzerostress.com; since 10-17 they've posted about 38 videos a day, and pregnancy-themed ones pull 42k–98k views; in 11-01 the videos literally say "l'app c'est Zest"; installs and the chart peak hit the same week (TikHub, Play library, iOS library)
- Verified July's TikTok hit (PCOS topic): 07-30 views 433k and 08-01 views 303k, after which the Play version launched 08-27; no data on how many downloads it drove
- Verified YouTube Shorts repost account @brothersdiet: 779 subscribers, 84 videos, links to zestzerostress.com, most views in the hundreds
- Verified Instagram "Zest - zéro stress à table !" brand collab / lifestyle account: Jina search finds posts from 2026 7–September (collabs with enzya and a TOP CHEF cooking class); scale unknown
- Inferred Paid ads (Meta / TikTok / ASA): not found in our ad libraries, but those libraries only track products on our list
Zest: Scan Produit&Restaurant (fr.zest.app) research report
Date 2026-11-06. Sources: our googleplay / appstore libraries ("Play library" and "iOS library" below), the Google Play and App Store listings, TikHub (TikTok), Jina web search, x-radar. Anything unverified is marked "unverified."
One line
A dietary-restriction scanner app built by French indie developer Noam Rivet: scan a barcode to see if you can eat it, find restaurants by restriction, covering 3000+ restrictions (allergies, celiac, pregnancy, PCOS, halal, vegan, etc.), with separate profiles per family member; after a 7-day trial it forces a subscription at €9.99/month or €49.99/year. Its recent surge comes almost entirely from the founding team's own TikTok account "Brothers Diet" (@brothers.diet): since Oct 17 it has posted 1–3 videos a day, using anxiety-driven, boyfriend-persona clips like "3 dangerous foods for pregnant women (Listeria / toxoplasmosis)," "3 things you can't eat with PCOS," and "gluten-free pizza for my celiac girlfriend" to funnel traffic to Zest. The product itself is the French version of America's Fig (Food Is Good): Fig isn't listed in France, and Yuka only covers nutrition scores and a few preference flags.
1. Data: how big it is and when it took off
Google Play (cumulative global installs, Play library)
| Date | Total installs | Average daily new installs | French health free chart |
|---|---|---|---|
| 10-22~10-28 | about 500→947 | about 64/day (AppstoreSpy estimate) | — |
| 10-29 | 947 | — | 118 |
| 10-31 | 1,498 | — | 113 |
| 11-02 | 2,134 | about 297/day (averaged between two observations) | 90 |
| 11-03 | 2,346 | 212 | 82 (best) |
| 11-06 | 2,645 | About 100/day | 120 |
- The listing shows "1k+" downloads, 4.1 stars / 13 reviews; it has only charted in France. The Play listing date is 2026-08-27 (may have been reset by metadata changes).
- +1,698 over the last 7 days, but the daily average of new installs has fallen from about 300 in early November to about 100; this wave is fading.
App Store (iOS library, id 6758613748)
- Released 2026-02-27; current version 2.2.4 (released 10-23, release notes: "New onboarding flow, tutorial, home screen, can analyze recipes seen on social networks, and fixes").
- French rating count: 10-28 was 16,11-06, now 24 (+7 over the last 8 days); current average 4.54.
- French health free chart: 10-28 #59 → 11-03 #21 → 11-06 #47. It peaked the same day as on Play. It also charted on the health charts in Belgium, Switzerland and Luxembourg (#144–204), but with almost no ratings.
- iPhones have a high share in France, so the #21 iOS health chart position likely means more downloads than on Play (unverified).
It was renamed: in the iOS library, one 2026-03-24-star review from 1 reads "Allerfy est une appli dangereuse…", and the support page zest-support.vercel.app still lists [email protected]. So it launched in February as Allerfy and was later renamed Zest ("Zéro stress à table"). Early on there were also 2 1-star reviews saying "unreliable, got me hospitalized," "subscribed and it didn't help" (2026-03). The most-liked review on Play, with 13 likes, is just the word "Payant." (Paid), and another says "Application payante": users object to a forced paywall.
Entity: the store lists developer Noam Rivet (address in Villiers-le-Bâcle, 91 Essonne department); the payment page pay.zestzerostress.com says "Zest est éditée par My Star LLC." zestzerostress.com redirects straight to the Play listing; there is no real website.
2. Growth tactics: where users come from
2.1 founder-run TikTok account "Brothers Diet" (confirmed, the main driver)
- TikTok @brothers.diet: 1,185 followers, 33.7k likes, 63 videos; bio "Ce que tu ✨peux✨ manger ⬇️", linking to Zestzerostress.com (TikHub user profile, 2026-11-06).
- Same-name YouTube Shorts channel @brothersdiet: 779 subscribers, 84 videos, also linking to zestzerostress.com. It reposts TikTok content, most views in the hundreds, top video 88k.
- Posting rhythm (from the TikHub video list):
- 2026-07-30 "Trouver ce que ma copine ✨peut✨ manger avec #sopk" (finding what my PCOS girlfriend can eat) 433k views; 08-01 "Giving my PCOS girlfriend a dinner" 303k views. After these two took off, the Play version launched on Aug 27.
- No videos from August to October (possibly deleted, or never posted).
- Since 10-17 it posted 1–3 videos a day, about 38 videos total by 11-06. Top views:
- 10-17 "Mac and cheese for my pregnant wife" 98k
- 10-28 "3 dangerous foods for pregnant women" 69k; 10-31 "3 dangerous foods for pregnant women (the last one causes toxoplasmosis)" 69k; 10-25 "3 dangerous foods for pregnant women, watch out for Listeria" 42k
- 10-19「Gnocchi without gluten for my celiac girlfriend」34k
- 10-21「4 essential apps for pregnancy」32k (slipping Zest into the list as a soft pitch)
- 10-24「3 dangerous foods PCOS girls don't know about」24k; 10-27「Can pregnant women eat this?」21k; 10-20「Anti-inflammatory diet: my girlfriend lost 6 kg in two months」19k
- 11-01 That one name-checks it directly: 「Pour savoir quoi manger, l'app c'est Zest 🍋」
- The formula: ① boyfriend/husband persona, 「I cook Y for my girlfriend who has X」; ② anxiety-list format, 「3 dangerous foods when you have X」 / 「3 foods to cut out」; ③ 「3 essential apps for X people」, with Zest mixed in as a soft pitch. Topics have spread from allergies to pregnancy, PCOS, endometriosis, acne, celiac disease, halal eating, and anti-inflammatory weight loss. Zest covers 3000+ restrictions, so every audience can be funneled to the same app.
- How it lines up with the install curve: 10-17 daily posting begins → around 10-22 Play daily installs reach roughly 64 → 10-25 to 10-31 pregnancy-themed videos run back to back at 4–70k views → 10-30 to 11-02 daily installs hit about 300, and 11-03 both stores' charts peak together → after 11-04, video views drop back to the hundreds and daily installs fall to about 100. The timing matches exactly.
- 10-23 release added 「analyze recipes you see on social networks」, clearly built to catch the traffic from this short-video-to-app funnel.
2.2 Instagram「Zest - zéro stress à table !」(existence confirmed, reach unknown)
- Jina found this account's posts from 2026 7 through September: brand partnerships (enzya digestive enzymes, a Geneva TOP CHEF cooking class), a no-additives challenge, and so on. It positions itself as a lifestyle account for people with dietary restrictions. Follower and engagement counts weren't retrieved.
2.3 Paid acquisition (no evidence found)
- Neither our Meta Ad Library nor our TikTok Ad Library shows zest, zestzerostress, or this package name. Those libraries only track products on our watchlist, so no result doesn't mean no ads. No Apple Search Ads data.
2.4 media / X / Reddit (none)
- Jina searched "Zest allergie application", "Noam Rivet" and "zestzerostress": apart from the store listing and third-party store-stats pages, there's no press coverage at all. x-radar searched zestzerostress and "Zest allergie": 0 posts in the last 90 days. No TrustMRR listing, and the founder has never posted about revenue.
3. Competitors
| Product | Where | Launched | Scale | How Zest differs |
|---|---|---|---|---|
| Yuka | iOS / Android | 2017 | Play: 43.9M installs globally; iOS French store: 296k ratings; free Health chart #8 | A French national barcode-scanning app built around nutrition scores and additive ratings. Premium only alerts on a handful of items: gluten, lactose, palm oil, pork, vegetarian, and so on (help.yuka.io). It doesn't handle multiple allergen combinations, family profiles, or restaurants. |
| Open Food Facts | iOS / Android / open source | 2012 | Play 2.94M | A free open-source database that can flag 14 allergens but makes no personalized judgments. Zest very likely uses its data (unverified). |
| Fig: Food Scanner | iOS / Android (US) | 2021 | Play 850k; claims 1M+ members | Zest's prototype: also claims to cover 「every」 dietary restriction (2,800+), find edible food, restaurants, multiple profiles, subscription around $50/year. The copy is nearly identical (「find food you CAN eat」 vs 「ce que vous POUVEZ manger」). Fig doesn't show up on the French App Store (iTunes lookup with country=fr returns 0 results), and its product catalog is US-based. |
| BellySafe – Manger serein | iOS / Android (France, SAS Point Virgule) | 2026-02 | iOS French store: 55 ratings, but ranked #11–16 on the Health Top Grossing chart; Play 5,680 installs | Only handles food safety during pregnancy (scan products, photograph dishes and menus). Its TikTok @bellysafe.app also posts 「7 apps I kept after 3 months of pregnancy」, the same format as Zest's 「3 essential apps for pregnancy」. This shows pregnancy food anxiety can make money in the French market, and Zest is riding that wave. |
| Liv(liv-apps.com) | iOS / Android (France) | Not verified | Not verified | Food scanning for pregnancy, developed with healthcare professionals |
| DiabeteFood Scanner | Android (France) | 2026-04 | 10.5k on Play | Diabetes only |
| Ma vie d'Allergik(ALK) | iOS | 2019 | France: 1,016 ratings | A pharma-made pollen/allergy management tool that doesn't scan food |
| Allergenius / Codiz / Allergo / Gluten Scan / NutriAllergie, etc. | iOS (France) | 2016–2026 | Each under 20 ratings on the French store | Small French allergy-scanning apps that never got traction |
| Gluten Free Scanner | iOS / Android | 2022 | Play 390k; iOS French store 1,514 ratings; Health Top Grossing #48 | Gluten-free only, built by a UK team |
| Spokin / AllergyEats / Picknic / Find Me Gluten Free | Mainly US | 2010–2020 | FMGF has 1.53M on Play | Allergy-friendly restaurant reviews only, with weak coverage of France |
| SafeBites / MenuCheck / SafeEat / Allergym, etc. | New releases from the UK and US | 2025–2026 | Small | AI menu scanning, pushed on TikTok through small accounts posting 「POV」 videos. None are large. |
Bottom line: no French product offers the Fig-style combination of multiple restrictions, family profiles, a French product catalog, and restaurants. Yuka is too broad, BellySafe is too narrow (pregnancy only), and local allergy apps never took off. Zest is filling that gap.
4. Why it took off
- Its own TikTok content account is the only visible engine. @brothers.diet has posted daily since 10-17, with pregnancy-themed videos at 4–100k views. Those views line up in the same week as the Play and iOS install spikes and chart peaks. Once the videos cooled off, installs dropped back too (TikHub post list + Play library + iOS library).
- The content widened from 「allergies」 to 「everyone has dietary restrictions」. The viral videos weren't about allergies. They were about pregnancy (listeria, toxoplasmosis) and PCOS. Those audiences are larger, the anxiety runs higher, and French TikTok already had viewers for them (BellySafe reached the Health Top Grossing #11–16 on pregnancy alone). Zest covers 3000+ restrictions, so videos for every audience can funnel to the same app.
- Localizing Fig for France. Fig isn't available in France, and Yuka can't handle combined allergies. Zest claims the space with a French product catalog, multi-profile family accounts, and French-language content. It uses a 7-day trial followed by mandatory subscription, with pricing copied from Fig (€49.99/year).
- Small scale, and already declining. Play shows only 2,645 installs and the French iOS store has only 24 ratings. Its best ranks were #82 on the French Health Free chart (Play) and #21,11-06 (iOS), and it has since fallen to #120 / #47. Revenue isn't visible (it doesn't appear on the iOS grossing chart).
5. Differentiation, and whether that's why it took off
- Differentiation: ① one app covering 3000+ restrictions, not just allergens; ② multiple family profiles; ③ restaurant filtering by restriction; ④ a product catalog built for France; ⑤ in October it added 「analyze recipes you see on social networks」 to catch traffic from short videos.
- Is it the cause? Product differentiation is a necessary condition, not the driver. Breadth lets the content account rotate audiences (pregnancy, PCOS, celiac, halal, anti-inflammatory), and every topic can end with 「check on Zest whether you can eat it」. But users actually arrive through anxiety-driven TikTok content. The product itself has no moat: Fig could enter France at any time, and BellySafe could expand beyond pregnancy. Reviews complaining about 「Payant」 and a March one-star review calling it unreliable and sending someone to the hospital show that the experience and data accuracy aren't settled yet.
6. What to borrow
- 「US vertical subscription app like Fig × European-language markets nobody has entered」: Germany, Spain, Italy, and Japan could all copy this playbook. The key is a local product catalog (Open Food Facts has data for every country).
- Persona account + anxiety-list format: 「I cook Y for my girlfriend who has X」, 「3 dangerous foods when you have X」, 「3 essential apps for X people」. One account can rotate across several conditions and audiences at low cost and post daily.
- Target high-anxiety, high-willingness-to-pay audiences: pregnancy (food safety), PCOS, celiac disease. These are bigger than 「allergies」 and more likely to get a click.
- Build a hook for content traffic into the product (「analyze recipes you saw on social media」), giving people who just watched a video a reason to open the app right away.
7. Still unclear
- iOS downloads and revenue (it isn't on the grossing chart, so no data); trial-to-paid conversion rate is unknown.
- Between 8 and October, did TikTok stop posting or delete videos? Did the two July videos at 30–400k views drive any iOS downloads (our library wasn't collecting data yet at that time)?
- Whether it ran Apple Search Ads, Meta, or TikTok ads (the ad libraries don't track it).
- What the relationship is between 「My Star LLC」 and Noam Rivet, and how many people are on the team (「Brothers」 may mean two brothers co-founding it).
- Where the product data comes from (Open Food Facts?) and how accurate it is (early reviews include serious complaints about unreliability).
- The size of the Instagram account.
Sources
- Play store page: play.google.com/store/apps/details?id=fr.zest.app (4.1 stars / 13 reviews, 1k+ downloads, reviews, developer info)
- App Store: apps.apple.com/fr/app/zest-scan-produit-restaurant/id6758613…; iTunes lookup (launched 2026-02-27, version 2.2.4, 24 ratings in the French store)
- Play library app_day / app_day_ext / chart_rank (fr.zest.app, 2026-10-29~11-06); iOS library app_day / review (6758613748)
- TikTok @brothers.diet profile and post list (TikHub, scraped 2026-11-06)
- YouTube @brothersdiet:www.youtube.com/channel/UCDuH0clKOcH2QgRDmCYtN5w
- Payment page: pay.zestzerostress.com/ (My Star LLC); support page: zest-support.vercel.app/ ([email protected])
- Instagram「Zest - zéro stress à table !」post: www.instagram.com/p/DVykNprDGGe/
- Yuka Premium preference alerts: help.yuka.io/l/fr/article/dop80j54bb-quelles-fonctionnalites…
- Fig: apps.apple.com/us/app/fig-food-scanner-recipes/id1564434726 ; kaibu.app/compare/fig (2800+ restrictions)
- BellySafe: bellysafe.app/ ; TikTok www.tiktok.com/@bellysafe.app/photo/7692399329566395680 ; iOS library 6758073678
- x-radar search for "zestzerostress" "Zest allergie" in the past 90 days, 0 posts; Meta / TikTok ad libraries show nothing