Everyone else charges subscriptions, it's free: how DecoAI ended up #1 on France's home chart

In Sep 2026 22, someone gave a one-star review on Google Play to an AI home-design app with 15M installs: "Free lures you in, but everything costs money. The only free part is the install." Two weeks earlier, a Vietnamese studio had launched an app with an almost identical name, and its website's first screen said: every style, every generation, free. Two months later it had 126k cumulative installs and sat at #1 on France's House & Home free chart daily. Below is how it did it and whether this path is still worth taking.

Sep 5, a studio using Gmail as its support address

DecoAI's developer is SVLink App. Its support address is a Gmail account under a Vietnamese name, the website is hosted on a free Netlify domain, and the privacy policy lives on Google Sites. It launched on Google Play in Sep 2026 5, and the same account put out a photo translation app in Oct 14, which reached under 11-06 with 10k installs. It looks like a small studio testing several apps.

The usage is simple: photograph a living room, bedroom, kitchen, bathroom, or the house's exterior, garden or pool, pick a style (Nordic, Japandi, modern luxury, Dark Academia, and the site says 100 more), and a redesigned image appears in seconds with walls, windows and furniture kept in place. No prompt writing, and a slider lets you compare with the original.

This category is already crowded

AI photo redesign is not new. The top players on Play already have tens of millions of installs (Google Play, 11-06):

Just in the 2026 years, dozens of new or charted AI interior design apps have appeared, and ChatGPT and Gemini's image editing can also restyle a room directly. Within this table, DecoAI is the small one.

What it competes with in terms of tens of millions of installs

First, price. The top players all install free and charge later. In DecAI's reviews, a Polish review says "without membership you can't do anything, maybe one or two free tries"; a one-star AI Remodel review from Oct 15 says "it says free, but to use it you have to pay, not even a free trial" (Google Play reviews). DecoAI's website FAQ is blunt: all styles, indoor and outdoor generation and the inspiration library are free, funded by ads; the only subscription removes ads and unlocks no features. The store listing reads "Contains ads, in-app purchases $4.99–$49.99".

It targets the free chart, not the grossing chart: as of 11-06 it had not entered the top-grossing chart in any country.

Second, one keyword title per language. The same app shows a different name on each country's chart (Google Play regional charts, 11-06):

• France: Home Design AI & Déco: DecoAI
• Spain, Mexico: Diseño de Casa con IA: DecoAI
• Poland: Projektowanie Wnętrz: DecoAI ("interior design")
• Germany: Home Design mit KI: DecoAI
• Brazil: AI Home Design: Decorar Casa
• Arabic-speaking regions: AI تصميم بيت وغرف: DecoAI

Each title packs in the "renovation / interior design / decoration" terms locals actually search. The results are consistent: it ranks well in non-English markets and doesn't break into English ones, sitting at #63 in the US and #38 in the UK.

Third, go for charts with low barriers. On France's House & Home Top Free chart 11-06, the #2 app Homely has only 16K total installs, and everything from #3 down is TV remotes, security companies, and real estate agency apps. Hitting #1 on this chart doesn't take much volume, and once you're on it, the chart itself brings exposure. DecoAI sat at #1 in France every day from 10-29 to 11-06.

A small detail: "DecoAI" differs by a single letter from "DecAI", which has 15M installs, so it may pick up some traffic from misspelled searches (inference, no data).

How fast it rose

Cumulative installs public on Google Play (the store refreshes about every two days):

It gained 35k over 8 days, an average of just over four thousand a day. 11-06 It appeared on the House & Home free charts in 24 countries: #1 in France, #3 in Taiwan, #4 in Poland, #5 in Malaysia, #8 in Mexico and Spain, #9 in Italy, #12 in Brazil. Over the past week it rose from #24 to #8 in Spain, from #21 to #8 in Mexico, and from #15 to #9 in Italy, so the Spanish- and Italian-speaking markets are climbing together.

Strangely, the ratings: 126k installs, yet the store page shows no rating and no reviews. It may be that the app has no rating prompt, or that the installs were bought at low quality (unverified).

Where users come from

What can be confirmed is store search: the localized titles and the distribution of country rankings line up.

No content spread: searching TikTok for "DecoAI", none of the top 20 videos feature it (the results are DecAI's official account); zero mentions on X in the past 30 days; no press coverage, no Reddit discussion.

So the rest is most likely paid acquisition. Steady four thousand a day, no ratings, nobody talking about it: this pattern looks like Google App Ads buying installs in low-cost markets, with ad revenue paying it back, which is the standard play for Vietnamese tool studios (inference). Its app-ads.txt lists 3 AdMob publisher accounts, 10 Meta Audience Network accounts and a string of resellers, a ready-made ad mediation template. I found nothing for it in the public ad libraries of Meta and TikTok, but not finding it doesn't mean it isn't advertising.

Where the money comes from

Ads. Interstitial and rewarded ads are the entire revenue model; the subscription only sells "remove ads". The math only works if image-generation models have gotten cheap enough that one or two ad impressions cover the cost of a generation by 2026 (inference). Its eCPM, retention and whether it breaks even aren't visible from outside.

What it actually wins on

Not in the product. One-tap style selection, walls and windows preserved, indoor and outdoor gardens all covered; several leaders offer the same. The store copy's line that "most home apps only do the living room" doesn't hold for DecAI or AI Remodel either.

Its differentiation is only the business model (fully free + ads) and distribution (localized titles + low-threshold category charts). Both work, and neither is a moat: any tool studio in Vietnam, Turkey or India could copy them tomorrow, and many already are.

If it were you

Verdict: the AI home-redesign app itself isn't worth chasing; the space is saturated, and House Decor, which launched a month later, bought 400k installs within a week. What's worth learning is how it got in: in an AI tool category where everyone charges subscriptions, go fully free with ads, and take #1 in small-language markets with low category chart thresholds.

Who it suits: tool app teams with existing ad monetization experience, AdMob / Meta mediation accounts, and the ability to calculate ROAS on Google App Ads; people who can integrate an image-generation API at low cost.

Who it doesn't suit: people who want to make money from subscriptions (this tactic doesn't make subscription money in the first place); newcomers without paid-acquisition budget or ad monetization experience, since behind a #1 free-chart spot there is most likely sustained spending.

How to do it: start with the category, not necessarily home design. The conditions: the top apps all have hard paywalls, and the reviews are full of "says free, but actually costs money"; per-generation cost is low enough that ads can cover it. Then build a fully free version, with the subscription only removing ads, and state clearly on the first screen of the store listing that "all features are free". Write a separate title per language, stuffed with local search terms.

How to acquire users: first check the cumulative installs of the #2 and #3 apps on each country's category free chart, and pick markets like France, Poland, Taiwan or Malaysia, where a few tens of thousands of installs get you into the top three. In those markets, push your ranking up with store search plus a small amount of app ads, then expand to neighboring language markets via chart exposure.

When to get in: the earlier the better. The window for this kind of opportunity is that the leaders haven't moved to a free tier yet; once big players like Home AI or DecAI launch "free + ads" versions too, or a general AI assistant makes style transfer smooth enough, the angle closes.

Signs you got it wrong: ① DecoAI drops out of France's home free chart top 10 within one or two months, which means the position was bought and falls when spending stops; ② installs rise into the hundreds of thousands while ratings stay at zero, or the app gets removed from Play, which means the quality of the volume is the problem; ③ a leading subscription app launches a free tier, and the price angle is taken back.

Data and sources

• Installs, charts, localized titles and store page text: Google Play public data, daily records from 10-29 to 11-06.
• Competitor reviews: public reviews on Google Play for AI Home Design: Interior DecAI and AI Remodel.
• Official site and FAQ, app-ads.txt: svlink-store.netlify.app, 11-06.
• TikTok search for "DecoAI", X search over the last 30 days, 11-06.
• Where it says "inferred" or "unverified", it means inferred and not verified.