Copycat apps: how to copy an app that works, and the risks

Copying an app that works means taking the mechanism a product already gets people to pay for and changing it on one point: the audience, the language, a feature or the format. The method works for a minority. Of the 120 calorie apps released after Cal AI with at least 100 US ratings, 73% earn under $5,000 a month and 10% earn over $50,000. The winners changed something real, or already had a way to get seen. The Prayer Lock story, from the original to its disappearance from the App Store, shows it step by step.

What is a derivative app?

A derivative app, often called a copycat app, is an app that reuses the mechanism a successful product makes users pay for and changes it on one point, with its own name, interface and copy. That is what sets it apart from a clone, which also copies the look and invites an Apple rejection. There are four ways to derive an app:

• Change the audience. Keep the feature and aim it at a specific group that does not see itself in the original. App blockers like Opal target everyone; Pray Screen kept the blocking and aimed it at Christians, with a prayer as the condition to unlock. A well-chosen audience changes everything else: the listing's vocabulary, the creators who talk about it, the keywords people type. The test: can you name three TikTok accounts this audience already follows?

• Change the language or country. Many profitable apps exist only in English, and their Spanish, Portuguese or French-speaking audience types searches where they never show up. FaithLocked, released in May 2026 with a listing built for Latin America, has more ratings in Mexico (1,182) than in the US (888). A real localisation covers the App Store listing, onboarding, paywall and prices, not just the interface. It also needs videos shot by people who speak the language, or distribution will not follow.

• Change a feature. Keep the need and change the way it is met, often with AI. Cal AI built the whole calorie-tracking experience around a photo of the meal, where MyFitnessPal relied mostly on manual logging; MyFitnessPal bought it, in a deal announced in March 2026. The new feature should remove the step the original's users hate, which their one- and two-star reviews often spell out word for word.

• Change the format. Keep the content and change how it is consumed. Scroll The Bible, released in December 2025, presents the Bible as a vertical feed to scroll, the gesture of social apps; it earns about $1M a month by our estimates. Format is often the most profitable twist, because nobody copies it by changing three words in a listing.

Key figures

According to Victoire estimates for September 2026 (gross monthly revenue, worldwide, rounded):

• Of 120 calorie apps released after Cal AI with at least 100 US ratings, 88 earn under $5,000 a month, 20 between $5,000 and $50,000, and 12 over $50,000. In this niche, and among apps that already have at least 100 ratings, roughly one in four clears $5,000 a month: that is a ceiling, not an average.

• Copies that take Cal AI's name too, like Pro Cal (13,684 US ratings) or Cal Plus, are under $5,000; BitePal, which turns tracking into a game with a mascot, is at about $500,000.

• Pray Screen, the app that started pray-to-unlock, is under $5,000 a month, with 9,675 US ratings and no update since September 2025.

• BibleScroll, released in February 2026 by the publisher of the screen-time app BePresent, earns about $100,000 a month: it is the top-earning faith blocker today.

• Prayer Lock (App Store ID 6744703926) has been missing from the iPhone App Store since August 2026, and still was on 6 October 2026; its Android version is still live on Google Play.

Where did Prayer Lock come from, and what happened to it?

Prayer Lock is an app that blocks social media until the user reads an AI-generated prayer, with a subscription at $9.99 a week or $49.99 a year. It was created by Mau Baron and his studio Covenant Studios, released in April 2025, and disappeared from the iPhone App Store in August 2026. Its story comes down to four apps.

Pray Screen, the original. Lotanna Ezeike launched Pray Screen in late 2024. According to his account on Superwall's blog, the app reached $120,000 in annual recurring revenue in five to six months, distributed by an agency running 10 to 12 TikTok accounts. He sold it within a week of tweeting that it was for sale, just as around 70 faith apps were appearing behind him. The creator sold at the top; the buyer inherited the competition. The app has not been updated since September 2025, and we estimate it under $5,000 a month today.

Prayer Lock, the derivative. Mau Baron told Startup Finder he built Prayer Lock in three days starting from Pray Screen, and changed three things: a prayer written by AI from the day's mood, an onboarding lengthened from 5 to 15 minutes that tells a story before the paywall (conversion reportedly tripled), and a subscription with no free tier after a few days of trial. On distribution, he describes around forty videos a day across 12 accounts, then TikTok ads on one creator's videos that had already taken off, at about $3 per free trial.

The removal. In August 2026, Prayer Lock disappeared from the iPhone App Store. On 26 August, a developer pointed out on X that Holy Mode and Viewtrack, two other Covenant Studios apps, vanished at the same time, which suggests action on the developer account rather than on a single app. The day before, on 25 August, Danna R. had posted on X a teardown of Prayer Lock's onboarding: a request to rate the app twice before even using it, a paywall saying "free" in huge letters while the $39.99-a-year subscription was the smallest text on the screen, an exit offer at $0.76 a week without the amount actually charged, and a discount countdown on the lock screen. Nothing proves that post triggered the removal, and neither Apple nor the publisher has explained it, but the timing speaks for itself. The Android version is still on Google Play.

BibleScroll, the current winner. While dozens of apps reused the name "Prayer Lock", the publisher of BePresent, a screen-time app with more than 66,000 US ratings, released BibleScroll in February 2026. The app changes almost nothing about the concept: it blocks apps until you read the Bible, plugs into the YouVersion app Christians already use, and switches to a subscription after a seven-day trial. Its edge is elsewhere: a publisher that already knew app blocking and already had an audience. That is the other way to win with a copy: arrive with your own distribution.

How much did Prayer Lock earn?

Prayer Lock's revenue is not reliably known. The figures its founder gave Startup Finder go from $10,754 a month in October 2025 to $21,097 a month in December 2025, for 58,800 downloads. Mau Baron later announced $300,000 a year in February 2026, about $25,000 a month, and his co-founder Ernesto Lopez $1 million a year for the whole studio in April 2026. Since its disappearance from the App Store, no recent estimate exists for the app.

How many copies succeed? The Cal AI case, counted

To measure the method instead of telling its winners' stories, we counted every Health & Fitness app with "calorie" in its title, released after Cal AI (April 2024) and with at least 100 US ratings. There are 120 of them, and here is their estimated revenue for September 2026:

The winners are not the most faithful copies. Those that take the name and the meal photo hit a ceiling; those above $100,000 added something else, or come from a studio that already knows distribution.

The same pattern shows elsewhere. Among the AI dating assistants launched after RIZZ (≈ $200k), WingAI reaches about $60,000 a month, while Flirt AI, with 7,479 US ratings, stays under $5,000. Umax, which added a self-improvement programme to selfie rating, is at about $70,000. Rating volume proves nothing about revenue: Pro Cal and Flirt AI have thousands of ratings and almost no revenue. That is why you start from estimated revenue, not from the charts.

The math before you code

A derivative app is decided on three numbers: price, conversion and the cost of a trial. The public orders of magnitude:

• Price. Prayer Lock charged $9.99 a week or $49.99 a year, and its founder reports $23.60 in average proceeds per paying user. A highlighted annual plan with a weekly option is the most common setup in this kind of app.

• Conversion. According to RevenueCat's 2026 report covering more than 115,000 apps, a median 10.7% of downloads become paying within 35 days with a hard paywall, against 2.1% for freemium apps, with nearly identical one-year retention. The same report puts the median free-trial-to-paid rate between 25% and 37% depending on trial length.

• Cost of a trial. Prayer Lock reports about $3 per free trial, obtained by paying to boost one creator's videos that had already taken off on TikTok. That is a good case, not an average; it is the number to measure in the first two weeks, not the cost per download.

• Apple's commission. The Small Business Program cuts the commission from 30% to 15% if your proceeds in the previous calendar year were under one million dollars. Enrolment is not retroactive: do it before the first sale, and your share of each payment goes from 70% to 85%.

The resulting math: a subscriber costs the price of a trial divided by the share of trials that convert. An example, not a measured average: at $3 a trial and one trial in three converting, a subscriber costs $9. On a $49.99 annual plan, you keep $42.49 after the 15% commission: the subscriber pays back on the first payment. If, after two weeks of testing, a subscriber costs more than half the first net payment, change the video hook or the angle before putting in more money. These figures come from apps that succeeded; treat them as ceilings, not a promise.

How do you copy a successful app in 6 steps?

To copy an app that works: start from a concept that already makes money, change one thing that matters, check that the keyword is lightly contested, build the core feature and paywall in a few days, and plan distribution before you write code.

1. Start from revenue, not from an idea. Open the trends Gems view, pick a category and note the small apps that are accelerating; every app page shows its estimated revenue. Keep a concept only if at least five apps in it earn $20,000 a month or more each: one profitable app may come down to luck, five prove a market. The full revenue ranking, with its filters (small publishers, recent releases, revenue per rating), can be queried from your AI assistant through MCP access. Finally, read the one- and two-star reviews of the dominant app: they are a free list of what to do better.

2. Pick one angle. An audience, a language, a feature or a format, not all at once. The angle must fit in one sentence ("Cal AI, but as a game with a mascot") and be hard for the leader to take back: a community, content in the local language or an integration like YouVersion are, a colour or a name are not. The count above shows what copies that change "almost nothing" get.

3. Check the keyword and the country. The word your audience will type must be lightly contested: few ratings among the top ten results, few titles containing it. Use the word people actually type in their language, not a translation of the English. The keywords page scores any search in any country, and the markets page shows, country by country, the share of poorly rated apps and the niche's momentum.

4. Build fast, but request permissions right away. Prayer Lock says three days, and an app like this is one core feature, an onboarding and a paywall, with one AI call. What takes time is elsewhere: blocking other apps requires an Apple entitlement you request before any distribution, and the answer can take weeks. Request it on day one.

5. Get onboarding and the paywall right. A quiz that gets users talking about their problem, shows them a personalised result, then presents the offer: that move from 5 to 15 minutes reportedly tripled Prayer Lock's conversion. Install the competing app and note every screen up to the paywall: number of screens, questions, when the offer appears, plans, trial length, preselected plan. Then test price and trial length from the first weeks.

6. Write the distribution plan before you code. Accounts, formats, rhythm, budget and one metric: cost per free trial. The launches described above rely on 10 to 12 accounts and dozens of videos a day to find the format that lands, then money only behind the videos that have already worked. Without this plan, the app joins the 73% in the table.

Why copy a proven app: 5 advantages

• Demand is proven. When an app already makes money, someone has done the most expensive work: checking that people pay for this problem. You no longer have to guess the need, only serve it better or somewhere else. The risk shifts to whether you can get seen, and that is where the budget should go. Knowing people pay does not mean you will reach them: three Cal AI copies in four stay under $5,000.

• The revenue model is known. The competing app's flow up to the paywall has already been tested on thousands of users, and you can read it in ten minutes by installing it. Price, trial, when the offer appears, which plan is highlighted: it is all visible. Starting from there saves weeks of trial and error; then you test your own variations one at a time.

• It is cheap to build and run. According to its founder, Prayer Lock ran with no user accounts and no database, with one AI call to write the prayer. An app like this can be built by one or two people with AI coding tools and costs a few dozen dollars a month to run. The money goes into distribution: videos, creators and ads.

• What sells is visible. The videos of apps that work are public on TikTok and Instagram, and Meta's Ad Library shows running ads with their start date; the ones that have run for months are often the ones that pay. Note the hook in the first three seconds, the persona, the length and when the app appears. The point is not to copy a video but to reuse a structure that has already proven it holds attention.

• Language opens whole markets. Many winning apps exist only in English, and their audience in other languages types searches where they never appear. FaithLocked has more ratings in Mexico than in the US, and the search "prayer lock" scores 10 out of 100 in difficulty in France against 17 in the US. The limit: an open language is not proven demand, and FaithLocked is still under $5,000 a month. Check that at least one app already earns in that language before you go.

What are the risks of copying an app?

Being first protects nothing

An app's mechanism is not protected: Pray Screen was overtaken by Prayer Lock, itself surrounded by dozens of copies, then BibleScroll took the spot. For the search "prayer lock" in the US, 7 of the top 10 apps carry those words in their title, and the top-ten median is only 27 ratings. Once a concept spreads on TikTok, other developers see it the same day you do. What protects you a little: a recognisable brand, a community, original content that takes time to recreate, an integration with a service the audience already uses, and a head start on ratings.

What do Apple's rules say about copycat apps?

The App Store Review Guidelines say it plainly: guideline 4.1(a) asks you not to "simply copy the latest popular app", and guideline 4.1 also forbids impersonating another app through its name, icon or listing, which titles reusing "Prayer Lock" come close to. Guideline 4.3 targets spam: apps that duplicate others and publishers that ship several variants of the same app. Since the June 2026 update, Apple may also remove non-updated apps in the saturated categories it names (dating, flashlight, fortune telling…), and repeated submissions of low-effort apps may lead to removal from the Developer Program; prayer apps are on neither list. You need a real difference in audience, feature or format, your own name and icon, and a clear explanation in the notes for the review team.

An app can vanish overnight

Prayer Lock proves it: an app with thousands of ratings left the iPhone App Store, along with two other apps from the same publisher, with no public explanation. A removal can come from Apple (a broken rule, complaints, a subscription judged misleading) or from the publisher itself (voluntary removal, account change, acquisition). Either way, iPhone revenue stops with the listing, and a closed account takes all its apps with it. Studios that live off this model publish several genuinely different apps, on iPhone and Android, and never put all their revenue on one listing.

Some features need Apple's approval

App blocking goes through Apple's Family Controls framework. You can build and test it on your own devices, but distributing an app that blocks other apps, even through TestFlight, requires an entitlement Apple grants after review, on a justified request, with no guaranteed timeline. Meanwhile, some teams ship a first version with a Safari content blocker, which needs no entitlement but only blocks Safari and must be switched on by the user in Settings.

TikTok throttles more than it bans

People who run multiple accounts describe it this way: the usual risk is not suspension but a shadowban, an account flagged as inauthentic (recycled videos, mechanical posting) whose videos stall at a few hundred views. TikTok puts it differently: it may make a video ineligible for the For You feed, and does not always say so clearly. Teams running around ten accounts regularly lose reach on some and plan to open others: it is a cost to budget for, not an accident.

The format that sells looks like a testimonial, and it must be disclosed

The videos that launch this kind of app show someone on camera talking about their job or their problem ("I work in HR, here is what resume-screening software actually looks for"), then the app; for Prayer Lock, it was a filmed reaction followed by a demo. When the video is paid, the law requires disclosure: in France, the law of 9 June 2023 requires the label "Publicité", "Collaboration commerciale" or an equivalent mention, and makes the advertiser jointly liable with the creator for harm caused; in the US, the FTC requires any commercial relationship to be clearly disclosed; in the UK, the ASA asks for an "Ad" label. A fake testimonial that hides its link to the app is still a deceptive commercial practice, even when posted by a brand account. The label changes little: what hooks viewers is the persona and the problem stated in the first seconds.

An aggressive paywall has a cost

A hard paywall converts better, but you pay for it elsewhere: users who feel trapped by a trial that renews on its own, one-star reviews that mention the price, refund requests. On a subject like faith, the charge of making people pay to pray comes quickly. Showing the price clearly before the trial and sending a reminder before it ends limit the damage, and Apple's rules require you to state clearly what users get for the price anyway. Prayer Lock shows the risk: its onboarding, described publicly the day before it disappeared, hid the billed amount behind the word "free". A paywall that converts through a trick can cost you the whole listing, and a competitor or a user only needs a screenshot to report it.

You only hear from the winners

The revenue screenshots that circulate on X or in podcasts come from people who succeeded, often just as they launch a course, a tool or an agency. Those who copied the same idea and got nothing do not post: they are the 88 calorie apps under $5,000. For Prayer Lock, figures range from $10,754 a month announced in late 2025 to $75,000 a month estimated by a third-party site, not counting the $1 million a year claimed for the whole studio. Before believing a figure, compare it with an independent estimate and look at what the app shows publicly: ratings by country, update rhythm, presence in the charts.

Is there still room in faith apps?

Yes, but not where the copies crowd in. Among faith apps from small publishers released since 2024, the top earners (September 2026 estimates, worldwide) do not block anything: they replace social scrolling with Bible content, or let you talk to an AI.

On the French App Store, the search "prayer lock" scores 10 out of 100 in difficulty, with a top-ten median of 9 ratings, and no Christian pray-to-unlock app there has more than a few dozen ratings. On the Muslim side, the ground is already taken: Khushu, released in February 2026, has 1,805 ratings in France, and the prayer-reminder app FivePrayer 952. A Christian prayer lock in French is still open, provided it is distributed with French-speaking creators, but demand there is less proven than in English.

Frequently asked questions

Is it legal to copy an app?

Reusing an app's mechanism or idea is not forbidden in itself: copyright protects expression, not ideas. The original's name, logo, copy, images and code do belong to their owner, and a registered trademark cannot be reused. Apple adds guidelines 4.1 and 4.3: an app that merely copies the latest popular app can be rejected or removed. This is not legal advice.

What is the difference between a derivative app and a clone?

A clone reuses another app's interface, copy and listing. A derivative app reuses only the mechanism that makes users pay, changes the audience, language, feature or format, and rebuilds everything else. A clone risks an Apple rejection and a complaint, and our data shows it rarely pays: the Cal AI copies that take its name are under $5,000 a month.

Is Prayer Lock still available?

Not on iPhone: Prayer Lock, by Mau Baron and Covenant Studios, disappeared from the App Store in August 2026, at the same time as two other apps from the same publisher, and was still missing on 6 October 2026. No official explanation has been given, but the day before, a public teardown of its onboarding on X pointed to a paywall hiding the billed price and repeated rating requests. Its Android version is still on Google Play, and on iPhone the concept's current winner is BibleScroll.

How many copies of an app succeed?

A minority. Of the 120 calorie apps released after Cal AI with at least 100 US ratings, 73% earn under $5,000 a month, 17% between $5,000 and $50,000, and 10% over $50,000, according to Victoire estimates for September 2026. The top earners added more than the name (a game, voice logging) or come from a studio that already knows distribution.

How long does it take to launch a derivative app?

Founders of this kind of app talk about three days to a few weeks for the product. Apple's entitlement to block other apps can take longer, which is why you request it on day one. Distribution takes weeks to months: it takes dozens of videos to find the format that lands.

What budget do you need?

Development is cheap: a few dozen dollars a month in tools and servers for an app like this. The real cost is distribution: video creators and ads behind the videos that have already worked. Prayer Lock says it reinvested $4,000 in October 2025 and then $6,000 in November. Measure cost per subscriber before raising the budget.

Should you target the US or another country?

In the US, copies pile up on every concept that works, but that is where people pay the most. A language the original does not support (Spanish, Portuguese, French) gives you an open keyword, but demand there is less proven. The sensible middle ground: a concept that already earns in English, and at least one sign of demand in the target language, such as a local app that is gaining ratings.

How can you tell whether an app really makes money?

Apple does not publish app revenue. Victoire shows a rounded monthly estimate on every app page; otherwise, look at ratings by country, update rhythm and presence in the charts. Be wary of figures announced by founders, especially when they are selling a course.