One person, one Expo setup, "free": Turkish calorie app FİT KAL gets under two thousand installs in seven weeks
What it is An all-Turkish, completely free, ad-supported diet and fitness app: snap a photo to count calories, get Turkish recipes, plus workout plans and fasting tracking.
Why it's catching on It isn't really catching on yet: under 2,000 installs in seven weeks, around a hundred a day. The traffic comes from Turkish-language store search, daily posts on the official Instagram and the founder's personal network; the pitch is that rivals all have paywalls and it charges nothing.
CHow you could follow it Don't build Turkey again, and don't copy the all-free model. Find a language market where a Cal AI-style product hasn't saturated and has its own cuisine; build it on the same stack in a few weeks, charge per scan or a cheap subscription, and deepen a local recipe library.
- Data (updated daily) · first launch 2026-09-18 · 11-07 installs 1,958
Android · Total installs worldwide Data 2026-10-29 → 2026-11-07 (10 days, 9 observations). Google's detail page only refreshes install counts every other day, so a flat day doesn't mean nobody installed.
FİT KAL is a diet and fitness app built solo by a Turkish developer, all in Turkish and completely free. It's slowly climbing the health and fitness free chart in Turkey, up nearly 40% in a week, but the base is still just over two thousand. This piece covers how it got started, why "everyone else charges, I don't" hasn't brought in much traffic, and what someone wanting to build a calorie app for a small-language market can learn from it.
A LinkedIn launch post
On the morning of Oct 9, 2026, Enes Kacar posted on LinkedIn: "I've been building FİT KAL for a while, and today it's live on the App Store and Google Play." He said the starting point was simple: using one app each for calories, diet, training and fasting was exhausting, "and most of them don't know Turkish food."
The post also laid out the stack: React Native (Expo) with TypeScript, one codebase for iOS and Android; Supabase on the backend, photo recognition handled by Google Gemini, with Apple Health and Health Connect integrated. He said the biggest lesson was that "writing code is only half of it": store review, privacy disclosures, Turkey's personal data protection law (KVKK) and real-device testing took no less effort than development. The closing line: "The app is free, and the download link is in the first comment."
The actual launch came three weeks before this post: iOS on Sep 16, Google Play on Sep 18.
What it is
The website's first screen reads "Yemeğini çek, gerisini FİT KAL halletsin": snap your meal, and FİT KAL handles the rest. The features are the Cal AI playbook plus a lot more:
- Photo-based calorie and macronutrient counting, barcode scanning too, and text description when a photo won't work
- Builds meal plans by goal, diet type (keto, vegan, gluten-free, fasting) and allergies, auto-generates a shopping list sorted by supermarket aisle
- 70 Turkish dishes in a "fit" version, each with calories labeled
- Workout plans and an exercise library with set-by-set timers (website says 87+, Play store description says 600+, the two don't match)
- Fasting, water tracking, weight curve, XP and badges
Play page says "Contains ads," no in-app purchases. The website and Instagram push "%100 ücretsiz" (100% free) as the selling point.
How many
| Date | Google Play cumulative installs | new during the period |
|---|---|---|
| 10-24 | About 1,060 | Third-party estimate |
| 10-28 | 1,201 | About 35 a day |
| 10-31 | 1,456 | 3 days +255 |
| 11-04 | 1,763 | +307 |
| 11-06 | 1,958 | +195 in two days |
7 days, 757 new installs, climbing from a few dozen a day at the end of October to around a hundred a day by early November. It has only charted in one country, Turkey, in the Health & Fitness free chart: #150 at end of October, then 11-04, 142,11-06, 111 (Google Play per-country category chart). The Turkey chart has a low bar, and roughly a hundred installs a day gets you into the top 160. It has no Play ratings yet.
iOS Turkey store: 4.43 stars from 14 ratings (App Store, 11-06). The reviews read like friends: one says "Sahibi gibi boş bi uygulama" (an app as empty as its owner), which is clearly a joke between people who know each other. A few long five-star reviews too. These scores look more like friends and family showing support than feedback from strangers (inference).
Where users come from
App Store search, probably the main source (inference). The title is "Diyet & Egzersiz" (diet & exercise), and the description repeats kalori, diyet, aralıklı oruç (intermittent fasting), and Türk mutfağı (Turkish cuisine). It's only ranked in one country and its curve is smooth with no spikes, which is what organic search looks like. As the ranking climbs, daily installs climb with it.
The official Instagram posts every day. @fitkal_diyetveegzersiz has posted almost daily since Oct 7: explainer cards like "how many calories is this plate," product screenshots, and one post asking "FİT KAL ücretli mi?" (is it paid?) and answering "no." Every post uses the same dozen-plus hashtags, and the call to action is "link profilde" (link in profile). Engagement is low, 10-07 has 9 likes. I didn't see #reklam or #işbirliği, the tags for paid partnerships.
The founder's own circle. That's the LinkedIn post and the friend reviews on iOS.
It doesn't show up in the ad libraries, and there's no discussion on TikTok or X and no media coverage.
Who's competing
This niche in Turkey is already crowded. On 11-06, there were a dozen or more similar apps with kalori, diyet, or AI in their names on the Turkey Health & Fitness free chart.
| Competitors | Scale (Google Play installs, 11-06) | How it differs from FİT KAL |
|---|---|---|
| Yazio | $58.8M, #17 on Turkey's free chart | Big international player, already localized into Turkish, subscription |
| fatsecret | $63.2M, #15 on Turkey's free chart | Veteran, free with subscription |
| Foodvisor | $12.8M, #18 on Turkey's free chart | Photo-recognition pioneer, subscription |
| Welmi / Calo / Calz | $1.8M to $3.9M each | Cal AI-style product from an overseas-expansion team, multilingual, paid acquisition plus a paywall |
| Diyetkolik | $1.03M, #33 on Turkey's Top Grossing chart | Turkish veteran with a local food database and dietitian service |
| Tabak AI | 202k, 4.75 stars, #30 on Turkey's Top Grossing chart | A Turkish-made Cal AI, launched 2025 August, in-app purchases $1.99 to $27.99, already taking payments |
| EatBetter | 199k, #12 on Turkey's Top Grossing chart | Subscription model, making money in Turkey |
| Fittolog | +1,636 in 2,617,7 days, #69 on Turkey's free chart | A Turkish peer launched 28 September, with in-app purchases. It came out ten days after FİT KAL and is growing faster |
| Kalori Defteri AI | 911 | Launched 30 September, another Turkish solo developer |
| FitCi, Calnote | Not verified | Promoted through dietitians and food bloggers with discount codes |
"fit kal" means "stay healthy" in Turkish, a generic phrase. There are two other apps called "FitKal" on iOS and Play, so no one is copying anyone.
Why "free" hasn't brought in volume
What really sets it apart from local peers is one thing: it's free. Turkish-language UI and local recipes are already covered by Tabak AI and Diyetkolik, which launched earlier. The lira has lost value, and a subscription price is steep for many Turks, so people searching for "free calorie app" are the ones it catches (inference). But that group is small and not very valuable.
The problem is money. With around a hundred users a day, banner and interstitial ads barely earn anything, so there's no budget for paid acquisition and the scale doesn't grow. Photo recognition calls Gemini every time, so the more users it has, the higher the cost, and ad revenue may not cover it (inference). Fittolog, a peer from the same period that takes in-app purchases, grew 1,636 in a week, more than twice FİT KAL's pace. In this market, free hasn't beaten the paywall.
If it were you
Verdict: C. Copying a "free Turkish Cal AI" isn't worth it. The niche has big international players, local products already taking payments, and two or three solo developers who launched the same month. This one hasn't broken out either. Two things are worth taking from it. First, one person can rebuild the Cal AI model in another language in a few weeks with Expo, Supabase and Gemini. Second, in small-language stores, local-language keywords bring in steady small traffic.
Good fit for: people who already build cross-platform apps and have a language market not yet filled by Cal AI-style products. Look for places with a local cuisine, where international players haven't localized and there's no local Tabak AI-type product.
Bad fit for: anyone aiming at the Turkish market, it's already packed. Anyone hoping to run a product that calls a large model on a "fully free plus ads" model, the math doesn't work.
How to do it: pick one language market, search local-language terms like "calories" and "diet" in that store, and count how many of the top results are local and whether they charge. If you build it, don't copy FİT KAL's all-free approach. Give away basic logging and local recipes free, charge per use for photo recognition, or offer a cheap monthly subscription priced to local incomes, well below Cal AI's US price. The local recipe library is the one thing that's hard to copy, so make it deep.
How to get users: write store titles and descriptions with the words locals actually search. Post "how many calories is this dish" cards for local food daily on an official account. Cold start costs nothing, but FİT KAL's low engagement shows that's not enough on its own. Working with dietitians and food bloggers who hand out discount codes, as FitCi and Calnote do, converts better.
When to get in: the Cal AI model is being copied by solo developers country by country, one language at a time. In any market you're eyeing, someone will probably launch within three to six months.
Signs you got it wrong: ① FİT KAL climbed into the top 30 of Turkey's Health & Fitness free chart on free alone, with 50k installs. That would mean "free" is a strong enough differentiator in a market flooded with paywalls, so the C underrates it. ② Fittolog, a paid peer from the same period, has stalled at a few thousand installs. That would mean Turkey isn't crowded so much as this kind of demand is simply small. ③ FİT KAL adds a subscription or credit packs and its growth holds. That would mean the users it collected for free are valuable, and grow-free-then-charge works.
Data and sources
- Installs and charts: Google Play installs and per-country category charts, 2026-10-28 to 11-06. The 10-24 figures are third-party estimates (AppstoreSpy).
- iOS ratings and reviews: App Store Turkey store, 11-06.
- Launch post: Enes Kacar's LinkedIn, 2026-10-09.
- Features and "%100 ücretsiz": fitkalapp.com and the Google Play store page, 11-06.
- Instagram: @fitkal_diyetveegzersiz, posts from 10-07 to 11-06.
- Places marked "est.", "inferred", or "unverified" are estimates and inferences.
Research notes: competitor table, acquisition evidence, full research report
- Competitors
Name Where Launched Scale How it differs from this one Tabak AI iOS/Android 2025-08 Play 202k installs, #30 on TR Top Grossing, iOS TR 2,740 rating A Turkish Cal AI-style product with a paywall, already taking payments. FİT KAL is fully free. EatBetter iOS/Android 2024-09 Play 199k installs, #12 on TR Top Grossing Subscription model, making money in Turkey. FİT KAL only shows ads. Fittolog Android 2026-09-28 Play 2,617 installs, +7 in 1,636 days, #69 on TR free chart A Turkish peer launched nearly at the same time, with in-app purchases, and growing faster than FİT KAL Yazio iOS/Android 2014 Play 58.8M installs, #17 on TR free chart A major international player already localized into Turkish, subscription model, large database fatsecret iOS/Android 2009 Play 63.2M installs, #15 on TR free chart Veteran, free with subscription, not focused on AI photo recognition Foodvisor iOS/Android 2018 Play 12.8M installs, #18 on TR free chart The original photo-recognition app, subscription Diyetkolik iOS/Android 2012 Play 1.03M installs, #33 on TR Top Grossing Turkish veteran with a local food database and dietitian service Welmi / Calo / Calz iOS/Android 2025 Play 1.8M–3.9M installs each Overseas teams rely on paid acquisition plus paywalls, multilingual. FİT KAL does no paid acquisition, only Turkey. FitCi / Calnote iOS 2026 Not verified Turkish peers find nutritionists and food creators to push with discount codes, and have paid memberships. - Where users come from
- Inferred Turkish-language store keyword search: charted only in the TR store, smooth curve with no spikes; titles and descriptions stack Diyet / kalori / oruç terms; rank climbed from 150 to 111, daily installs rising with it
- Verified Official Instagram self-produced content: @fitkal_diyetveegzersiz has posted almost daily since 10-07, calorie explainers and product cards, traffic CTA "link profilde", a fixed set of hashtags; engagement is very low (9 likes)
- Verified Founder's personal network / acquaintance ratings: LinkedIn launch post on 2026-10-09; early iOS reviews read like they came from acquaintances ("Sahibi gibi boş bi uygulama")
- Inferred Paid ads / creators: no records in the metaads library, no content on TikTok or X, no #reklam partnership posts seen
FİT KAL: Diyet & Egzersiz (ENSS DEV / Enes Kacar): why it's gaining traction
- Package: com.fitkal.app (Google Play, Health & Fitness); same name on iOS, App ID 6807896776, developer Enes Kacar
- Developer: ENES KACAR, a Turkish indie developer. Support email [email protected], website fitkalapp.com (redirects from fitkalapp.github.io)
- Launch: first on the Play Store on 2026-09-18, iOS on 2026-09-16; the founder's LinkedIn only announced "launched today on the App Store and Google Play" on 2026-10-09 (public launch date)
- Monetization: Play lists it as "contains ads" with no in-app purchases (googleplay library, app_snap); the website and Instagram both push "%100 ücretsiz" (completely free)
- Versions: no updates since 1.0.14,2026-10-14
Bottom line
Strictly speaking, it hasn't taken off yet. 7 Under 2,000 installs a week, roughly 100 a day, ranked #111 in Turkey's Health & Fitness free chart. That spot is an easy one to hold in Turkey. The recall signal (7-day +757, 39% week-over-week) is a tiny base growing slowly. Current volume comes from three places: organic search on Turkish-language store keywords ("Diyet & Egzersiz", "kalori"), the founder's own LinkedIn and personal network (the early iOS reviews are clearly from people he knows), and the official Instagram account posting images and reels almost daily, with the call to action "link profilde". Its only real differentiator is fully free, fully Turkish, built around Turkish food: one app that covers photo calorie counting, recipes, workouts, and fasting. The competition is a set of localized, Cal AI-style subscription apps, all behind paywalls, and FİT KAL sits across from them. That pitch has only pulled in a small amount of volume so far, and the business relies on ads alone, which can't support paid acquisition.
1. Data
Google Play installs (googleplay library, app_day; estimated with AppstoreSpy before 10-24, in app_day_ext)
| Date | Total installs | increase |
|---|---|---|
| 2026-10-24 | 1,060 | AppstoreSpy estimate, tracking started |
| 2026-10-28 | 1,201 | About 35/day |
| 2026-10-31 | 1,456 | +255 (3 days) |
| 2026-11-04 | 1,763 | +307 (11-02 onward, 2 days; 11-03 not observed) |
| 2026-11-05 | 1,843 | +80 |
| 2026-11-06 | 1,958 | +115 |
- 7 days of new installs totaling 757; overall daily installs rose from roughly 35–85 in late October to roughly 100–150 in early November.
- Charts (chart_rank): only ever on Turkey's HEALTH_AND_FITNESS free chart, hovering between ranks 153–162 from 10-29 to 11-02, rising to 142,11-06 via 11-04 and 111. Never on any overall chart, never in another country.
- Play rating count is empty; no reviews in the library.
iOS (iTunes lookup, Turkey store, 2026-11-06)
- 4.43 stars, 14 ratings, version 1.0.14 (2026-10-15). The appstore library only saw it in the US store, rated 0; no tracking record for the Turkey store.
- Visible reviews cluster around 10-11, 10-14, 10-25 and early November, and read like acquaintances: one says "Sahibi gibi boş bi uygulama" (an app as empty as its owner), clearly a friend joking; there are also several long five-star reviews ("Yeni nesil diyet uygulamaları arasında zirveye oynamayı hak ediyor"). These ratings look more like friends and family cheering than organic user feedback (inferred).
II. Competitors (all doing "photo calorie counting + diet plans")
On Turkey's Play Health & Fitness free chart on the day 2026-11-06, more than a dozen similar apps with kalori / diyet / AI in the name (googleplay library, v_chart):
| Product | Platform | Launched | Scale (googleplay library 11-06 / iTunes TR) | How it differs from FİT KAL |
|---|---|---|---|---|
| Yazio: AI Kalori Hesaplama | iOS/Android | 2014 | Play 58.8M installs, +7k over 110 days; TR free chart #17; iOS TR 61k ratings | International giant, already localized into Turkish, subscription-based, large database |
| fatsecret Kalori Sayacı | iOS/Android | 2009 | Play 63.2M installs; TR free chart #15 | Long-running free app plus subscription, not主打 AI photo recognition |
| MyFitnessPal | iOS/Android | 2010 | 137M Play installs | The world's largest, a food database for the English-speaking world |
| Foodvisor | iOS/Android | 2018 | Play 12.8M installs; TR free chart #18 | The original photo-recognition app, subscription |
| Welmi / Calo / Calz | iOS/Android | 2025 | 1.8M–3.9M installs each | An overseas team's Cal AI-style product, multilingual, driven by paid acquisition plus a paywall |
| Tabak AI(Salim Nesefi Meriç) | iOS/Android | 2025-08 | Play 202k installs, 4.75 stars; TR grossing chart #30; iOS TR 2,740 rating | A Turkish local Cal AI-style product with in-app purchases of $1.99–27.99, already proven to earn |
| EatBetter(AI Sparks Labs) | iOS/Android | 2024-09 | Play 199k installs; TR grossing chart #12; iOS TR 19k ratings | Subscription model, making money in Turkey |
| Calyra(NUTRIA SAS) | Android | 2026-01 | 107k Play installs | Subscription AI calorie tracker |
| Diyetkolik | iOS/Android | 2012 | Play 1.03M installs; TR grossing chart #33 | Turkish veteran with a local food database and dietitian service |
| Fittolog(AFC LABS) | Android | 2026-09-28 | Play 2,617 installs, +7 over 1,636 days; TR free chart #69 | A Turkish peer that launched almost at the same time, with in-app purchases of $4.69–23.99, growing faster than FİT KAL |
| Kalori Defteri AI(cagan_inc) | Android | 2026-09-30 | Play 911 installs | Peers from Turkish indie developers in the same period |
| FitCi(@fitciapp) | iOS | 2026 | Not verified | A Turkish-language AI fitness coach + calories, running nutritionist creator partnerships with #reklam posts |
| Calnote | iOS | 2026 | Not verified | Recruits Turkish creators to promote with discount codes like DILARA20 (Instagram reel, 2026-05) |
| Namesakes "FitKal AI" (BURAK ORKMEZ, also called Bulky AI) and "AI Calorie Counter by FitKal" (Didem) | iOS / Android | 2026-06 / 2026-09 | iOS 56 ratings / Play 5+ installs | Name collision: "fit kal" is a common Turkish phrase meaning "stay healthy", not someone riding on another's name |
Bottom line: the category is extremely crowded. International giants have localized, and Turkish locals like Tabak AI and EatBetter are already charging as Cal AI-style products. Around 2026 September, at least three more Turkish individual developers launched in the same category at once (FİT KAL, Fittolog, Kalori Defteri AI).
3. Where users come from
- Turkish-language store search (primary, inferred): the title "Diyet & Egzersiz", and the description repeatedly uses high-frequency search terms like kalori, diyet, aralıklı oruç, Türk mutfağı. It charts only in the single Turkish store, installs follow a smooth curve with no sudden spikes, which is what natural search looks like. After 11-04 its rank climbed from 140 to 111, and daily installs rose with it, consistent with rank and search exposure feeding each other.
- Official Instagram account @fitkal_diyetveegzersiz: the bio reads "Fotoğraf Çek ➔ AI Kalori Hesaplasın…" (Take a photo ➔ let AI calculate calories…). Since 10-07 it has posted almost every day (10-16, 10-17, 10-21, 10-22, 10-28, 10-29, 10-30, 11-06 all present). The content is calorie explainers like "how many calories is this plate" and "Is FİT KAL paid? No", plus product cards, with a fixed set of a dozen-plus hashtags such as #fitkal #kaloritakibi #diyet. The traffic CTA is "link profilde". Engagement is very low (the 10-07 post has 9 likes). No #reklam or #işbirliği tags, the markers of paid creator partnerships, were seen.
- Founder's personal network: Enes Kacar published a launch post on LinkedIn on 2026-10-09, saying that using one app each for calories, diet, workouts, and fasting is exhausting, and most of them don't know Turkish food. The early iOS reviews read like they came from acquaintances.
- Not found: no advertiser for it in the Meta Ad Library (metaads library searched by package name, iOS ID, and name, 0 results; but that library only tracks products on its list, so not finding it doesn't mean it isn't advertising). On TikTok, searching "fit kal uygulama" turned up no content from it (TikHub). X has 0 posts (x-radar, last 60 days). No media coverage, no Product Hunt.
Correction to the recall card: the recall card said "the same batch of Instagram accounts still pushes FitCi, EatLog, QuickCalo, Tabak AI, looking like the same ad / reskin matrix." On checking, FitCi (@fitciapp), QuickCalo, Lifely AI, and Calnote each have their own accounts and developers. #fitkal is a general Turkish hashtag meaning "stay healthy", and Lifely AI also used it in posts from 2025. Search engines lumped these posts together in recall, which is why it looked like a matrix. There's no evidence FİT KAL belongs to any matrix; it looks more like a solo individual developer.
IV. Why it took off (on a small scale)
- It charges nothing: peers are mostly hard-paywalled Cal AI-style products (Tabak AI, EatBetter, Calyra, and Fittolog all have in-app purchases), while FİT KAL is entirely free, earning only from ads, and its social copy leads with "ücretli mi? Hayır" (is it paid? No). In Turkey the lira has depreciated, and subscription prices are steep for many people, so people searching "ücretsiz kalori uygulaması" (free calorie app) get caught by it (inferred).
- Full feature set, executed fairly carefully: photo recognition, barcode scanning, text entry, recipes generated by diet type and allergens, 70+ Turkish fit recipes, 87 exercises, fasting, water tracking, XP and badges, shopping lists. In its first month it was updated to 1.0.14, and the release notes mention polish details like "you can now find the right dish photo even with a misspelled search."
- The bar for Turkey's free Health & Fitness chart is low: a hundred-odd installs a day can land it at ranks 110–160, and the ranking brings a little more exposure.
5. Differentiation
Its differentiation is "free + all Turkish + Turkish food + one app for the whole family." Against local peers like Tabak AI and Fittolog, the only real difference is that it doesn't charge. Turkish-language and local recipes are something many are doing; Tabak AI and Diyetkolik did it earlier. This differentiation explains why some people download it, but not the growth: the volume is too small, and ad monetization at around a hundred installs a day brings almost no revenue, so there's no money for paid acquisition, and it can't reach the scale of Tabak AI. By contrast, Fittolog, which launched around the same time and charges through in-app purchases, grew 7 in 1,636 days, faster than it does.
6. Visibility and copycats
- Few people know about it yet: no public revenue, no coverage from media, X accounts, or TikTok. The LinkedIn launch post is the only "news".
- Copycats: none seen copying it. Conversely, it is itself another follower of the Cal AI model in Turkey.
VII. What to take away
- In small-language markets, "fully free + local recipes" is an angle against Cal AI-style paywalls and can capture natural search traffic. But think through where the money comes from: free apps with rewarded videos or banners can't fund paid acquisition. The more realistic path is to acquire users for free and then add a light subscription or a premium AI-credit pack.
- Posting daily 'how many calories is this dish' local-food explainer cards on the official Instagram is a zero-cost cold start. But without creator partnerships, engagement and conversion are very low. Similar apps FitCi and Calnote use nutritionists and food bloggers with discount codes, and the results are clearly better.
8. Not sure
- There's no attribution data on how many Play installs come from Instagram versus store search.
- Whether they ran small Meta / Google ads: the ad library only tracks products on the list, so there's no way to confirm they didn't.
- Whether @fitkal.app (a 20k-follower fitness repost account that posts things like '3 ayı -12.5 kilo' transformation clips) belongs to the same developer: the bio doesn't mention this app. Unverified.
- Our database has no record of the iOS Turkey-store chart position or rating growth.
Sources
- Google Play store page play.google.com/store/apps/details?id=com.fitkal.app&hl=tr (2026-11-06)
- iTunes lookup itunes.apple.com/lookup?id=6807896776&country=tr; reviews page apps.apple.com/tr/app/id6807896776?see-all=reviews
- Official site fitkalapp.com/
- LinkedIn launch post tr.linkedin.com/posts/eneskacar_fi%CC%87t-kal-yapay-zek%C3%A… (2026-10-09)
- Official Instagram account www.instagram.com/fitkal_diyetveegzersiz/; post www.instagram.com/p/DeM8QR6iPo3/ (2026-10-07)
- Comparable promo examples: Calnote creator reel www.instagram.com/reel/DYSahRcIqfX/; Lifely AI using #fitkal www.instagram.com/reel/DOyet2siDsw/; FitCi www.instagram.com/fitciapp/
- Databases: googleplay (app_day, app_day_ext, chart_rank, app_snap, v_chart, 2026-11-06), appstore, metaads (no records), x-radar (no records), TikHub search (nothing relevant)