I Built a $20K/Month Mobile App: Here’s My Entire Playbook

I launched my app six months ago and how it makes over 20k a month. This is Mao, a regular guy who changed his life by building an app with AI. It took me three days to code the app with AI. But this is not a story about how to build. It's a story about how fast apps can grow if you focus on the right things. I asked Mao to come onto the channel to break down exactly how he did all of this in just six months. And in this video, he breaks down exactly how he built a mobile app in three days with AI, the specific marketing strategy that got him his first few hundred paying users, and the playbook that ultimately scaled him to over $20,000 a month. Guys, this is an episode that you cannot skip. I'm Pat Walls, and this is Starter Story. Real quick, before we get into the interview, guys, Now is about to break down what's actually working right now when it comes to building and growing an app in 2026 and beyond. And if you're ready to build your app, I put a link in the description right there where you can get started right now building your thing. I'll talk about that a little bit more later, but let's get into the interview. All right, Mal, welcome to the channel. Tell me about who you are, what you built, and what's your story. My name is Mal Barron, and I built a Christian app that makes over 20K a month. In only six months, I've accumulated over 58K downloads, 6.7K reviews, and a 4.9 star rating on the app store. All right, Mal, before we get it all into that, what you built and everything. First, I'd love if you could share a little bit about your business model, pull up some of your revenue and analytics so we can really see this thing. My app is called Prayer Lock. It basically just blocks your phone until you pray. When you try to open one of them, we ask you two questions, and based on that, you get a dedicated AI-generated prayer. You recite it, and you're good to go. You can scroll away. It's a subscription-based app. I charge $49.99 a year or $9.99 a week. And in terms of monthly revenue, we closed December at $21,000 in sales. A previous month was at $15K and October was at $10K. We've been growing at over 50% a month. In total downloads, we have right now close to 58,000 downloads. We have a conversion rate of 43%. Our proceeds for paying user is $23.6. Our total proceeds have been 41,000. So my app right now probably has one of the best onboarding rates in the world. Our review rate is over 12%. We have 6.7K ratings with less than 60K downloads. In November, Prayer Lock reached number 22 in the reference category. Okay, cool. Well, thanks for showing your dashboards so transparently, showing all the numbers. That's amazing. We're going to get into all how you built this, grew this, and even a little bit of paid ads, which I'm excited about. But before, I know you started it this year, which is insane that it's grown this much. I'd love for you to give me a little bit of background on how you get here, how you decide to start building apps. How do you get to this point? I actually don't come from a tech background. I actually majored in finance, but I discovered the original Codex model back in 2022. When I saw that, I just completely fell in love with AI and technology. And I decided that's what I wanted to do for the rest of my life. So I taught myself about AI, about how to code. I've been building tech and AI businesses ever since. Back in January of 2025, I was actually building an adult content AI app. But when I finished it, I just felt completely like disgusted and disappointed in myself. So I decided to make the weirdest pivot in history and turn into the Christian space to try to reconnect with my faith. And after about three months of building apps nobody wanted, I came across this app called Pray Screen that blocked your phone until you prayed. And with the new insights I had, I looked at the design. I looked at the features, the way they were executing their distribution. And I said, you know what? I can do a better job than them. And so that's how prayer law came to life. Well, that's awesome. I think what the most interesting thing there that I heard is that by doing this, you were able to get closer to your customers and truly understand them, which led to this massive success that you're now seeing. Now, I think there's a little secret there. I want to switch the topics a little bit and get into the building of this app. You did this yourself, right? So how did you do that? I built PrayerLock back in June. I literally just used Cursor and ChatGPT. Like that's it. With Cursor, I mainly use Sonnet as my daily driver. And then I use Chat to ask questions and apply simple code changes with the Mac desktop app. And so, yeah, it took me three days to code the app and over a week to actually get it approved on the app store. But honestly, it's never been easier to build an app than now. That's insane that you built it in basically three days. Obviously, there were previous apps before, and you probably had tried and had starts and stops before. But once you found your idea that you really felt confident on, you're able to build it in basically three days. Do you have any tips for anyone watching here on how other people, maybe they have a little bit of experience, maybe no experience at all, how to build apps with AI in 2026? First of all, what I always say is do not design any mock-ups. Instead, study the best apps in your niche and study the best apps in other niches with tools like screens design and just go straight into coding. In my case, I actually created a Canva file where I laid out all of the best onboarding screens of the apps I liked and of my competitors. And I literally just chose the best onboarding screens and applied that to my own app. Also, try to use different tools for different purposes. For example, like Cursor as your daily driver, Codec CLI, which I love for more complex tasks, ChatGPT for questions and easier problems. And the reason you want to do this, at least if you're in my position, I was broke. So you don't want to be wasting hundreds or thousands of dollars on tokens. In doing this, you will diversify your token expenditure, right? Another thing is do not try to one-shot your apps. AI isn't there yet where you can just say like, hey, make me a mobile app, make no mistakes, don't hallucinate. Like that won't work at all. What AI is really good at doing is if you break down your app into blocks, and then of course you can one-shot a feature here, you can one-shot a design or a screen here. Next thing is authentication. Honestly, isn't even needed for modern apps. Like mine doesn't have authentication or a database and I'm printing money. The reason I made it this way is for two reasons. I wanted to reduce friction as much as possible. I don't want my users wasting time on signing up. And the other reason was to save costs. There's no reason to pay for a database when you can just save it all on device. And people might say, hey, when I switch my phone, I'm going to lose my information. Nobody thinks about that. Literally, that's a very niche case. So Mao's story is incredible. He built and grew his app to $20,000 a month in just a few months. If you stick around to the end, you're going to get the full story on exactly how he did it. But before we get there, I do want you to think about the app that you've been meaning to build. You probably already know how to use these AI tools or tried them out. You follow tutorials and probably even built pieces of different things. But what usually stops people from actually launching isn't the building part. It's picking something that's actually worth finishing and then taking it all the way to real users that can give you real market feedback. Well, that's exactly what Starter Story Build is designed for. In just a few days, you will choose an idea that makes sense, build it end to end, and actually launch with structure, momentum, and other builders doing it alongside you. If you're tired of half-finished projects, well, the link is in the description if you want to get started right now. All right, let's get back to the interview. I'm going to switch topics now to the growth, because everyone knows who's watching this. You'll read all the comments. They'll say, okay, you don't talk about the marketing enough. Building stuff is easy now. But as I understand, you were the builder and the marketer and the growth person. You did all this by yourself. What I want to understand is how did you actually grow this thing and get users? In the beginning, I didn't know what worked. So I literally just tried a bunch of different formats and I started posting around 40 times a day on 12 different accounts. Volume really matters here. What ended up working for me was the classic, you know, GDC girl reaction video with a demo on it. That's what one of my biggest competitors was doing and they were just killing it with it. I was broke so I couldn't pay for clips. I couldn't pay for another creator. So I just told my girlfriend at the time, now wife, to help me record some reactions herself. And she honestly killed it. We started posting twice a day. It wasn't until after 40 posts that I finally found a hook that worked. And I knew that I just needed to spam that in both TikTok and Instagram. When you start seeing that a format starts to work, put all your energies into that. That alone, with only that account, I was getting around 10k views a day, which was all I needed to get to my first 1k a month. With that, I immediately reached out to my friends and I wanted to scale this and I hired another UGC creators. It was honestly very hard to get her account, this other creator's account going on both TikTok and Insta. But after 14 days, we finally cracked one video, which organically got around 20k views. Knowing how views convert to downloads is very tricky. In my case, 10K views a day was getting me around 200 to 300 downloads a day. But this is because this specific format is very optimized for downloads. With those two accounts, with my wife's account and this other girl creator, I was now doing 1.5K in July and 2.4K in August. What's cool about that, as you said, is that I think a lot of people think, okay, I got to be posting on TikTok and YouTube and X and personal brand. But no, you only need to really be on one platform. For you, it was TikTok or Reels. And then you really only need one format that you just do lots and lots of videos over and over again. So I think that's a great lesson there. Once you started getting organic to work, what was next? Because obviously you were doing like 1, 2, 3K a month, but now you're doing 20K. So how do you get there? I hired an influencer. That flop didn't go well. But after that experience, I said, I want to try something else. The only other route was paid ads. When I tried them, I completely failed. I optimized for downloads instead of trials. I had a very bad onboarding. It was trash. I upgraded my onboarding from five minutes to 15 minutes. And generally, the longer you're onboarding, as long as it's adding value and telling a story, the better. I immediately saw my organic conversion rate more than 3x organically without paid ads. With my new knowledge, I said, you know, let's try this again. I now have a better conversion rate. I started with Meta and I started spending $20 a day. This was giving me, you know, respectable, decent results. $10 per trial started. Then I decided to try TikTok ads. And honestly, this changed everything. I created a super broad campaign without any audience controls, nothing. I only specified the location to US and inserted a bunch of my top UGC girl reaction videos from before. Started doing $20 a day only and the results were way better. They were insane. I was getting $4 per trial started when my yearly subscription cost $50. And I said, you know what? Let's go all in. I'm going to throw all my savings into this around $4,000 into the ads. And that's when I closed October at $10,000 only with these UGC reaction videos. Now with a little more budget, scrolling on TikTok, I came across Matthew, this cracked 15-year-old JVC creator. And the minute I saw like the first three seconds of his video, I was like, I need to work with him. So I reached out and we started working together. And he very quickly, organically got us to consistent 10K views per video. I was thinking of him as only a JVC creator. But, you know, one day I decided, you know what, maybe I should try Spark Ads on his videos as well, see how this does. The results were absolutely insane. with his videos, I started getting $3 for trial started. And I realized, hey, I can get into debt and pay all the debt completely with my next Apple payoff. So I threw another 6K into ads, into his videos, which got us to 15K for the month of November. Following the same strategy, increasing the ad spend regularly each week, we closed December at 20K and we're probably going to close January at 40K a month. Well, on that note, for anyone watching this, if they were starting over with an app or they had an app, they're ready to start growing the app, what would be your playbook if you had to start over in 2026? If I was starting over in 2026, this is exactly what I would do. Step one, look for niches with apps doing over 50K a month. Use Sensor Tower to get a revenue estimate for the apps. And then step two, find an app you like and improve it substantially. Step three, code it out in less than two weeks. This is very important. Set that as your limit because otherwise you'd want to improve the product. I've been there. Trust me. Step four, do not touch your app. Obsess over distribution. I haven't touched my app in over three months now. Just copy the working formats in your niche and start posting at least 20 times a day. Like that's what you should be aiming at, at least. And step five, iterate on your onboarding like crazy. Be a maniac. Improve the onboarding until you've at least have a 10% download to trial conversion rate. Later on, you want to do paid ads and you need at least a 10% download to conversion rate. Step six, place ad spend on your organic videos doing more than 10K views. And for this, I'd recommend TikTok, Spark ads more than Meta or any other platform. I love that playbook. Hopefully a lot of people watching this will go and do the same. We didn't really talk too much about what your app does. I really wanted to make this about the build, the growth and the paid ads. But I would love if you could give me a little demo of what your app does, how simple it is and how it actually works. Super simple. you just go into the app, you choose the apps to block, just block everything. And then you go into the home screen. And when you try to open one of your apps, you'll realize that they're blocked. So you open it and it prompts you to pray. That will open up the prayer lock app and ask you two questions. How's your relationship with God today? You indicate it. And then how are you feeling today? Based on that, you're going to get an AI generated prayer that you have to recite in order to unblock your apps. And once you're done reciting your prayer, you press, I've prayed today. you choose your next block schedule which can be the automatic next block schedule or you can like customize it for 15 minutes or an hour once you're done you get your streak and finally a very beautiful bible verse of the day and you can doom scroll away or use your phone as you will it's insane that the super simple app can make so much money but that's something i've learned like the key is in simplicity and actually adding value to your users now i'm curious how did you actually build this app could you walk me through your stack and then also some of the tools you use to grow and do paid ads as well? Cursor for coding and development. That's $20 a month. And ChatGPT for questions and coding. And then also, of course, Codec CLI, which is included in the subscription. So that's $20 a month. Right now, I'm using a lot of Rourke for quick design iteration, $25 a month. Then PostHawk for analytics. That's around $10 a month. Superwall, definitely for paywalls and revenue analytics, which is 20 cents per conversion. Then Singular as your MMP, which is basically the software that used to make paid ads. That's 5 cents per conversion after 15k free conversions. And then for all my backend services and hosting my web pages and everything, I use AWS. That's around $2 a month. Then as for the AI in-app services, I use Google Gemini Flash 2.5. It's around $9 a month. Yep. That's pretty much it. That kind of brings the next question of profits and how much are you actually spending on ads to grow this thing? Could you walk me through some of that? Yeah, of course. So paid ads are definitely a little pricey, but they are profitable. So it's worth it. So right now I'm spending $360 a day. If we go to the last 30 days, for example, for the month of December, which I closed at pretty much 20K, I spent around 9K. Basically my cost per trial right now is at $1.88. Thanks for sharing that and being super transparent, showing me all those paid ads numbers. Last question that we ask all founders who come on to Starter Story, if you could go back in time to six months ago before you started your app, or even before that, when you're trying to figure out what idea could actually work, what advice would you have to young Mao or to anyone watching this that wants to build apps in 2026 and really crush it like you? I wasted years building stuff nobody wanted. And the reason is because, I mean, you have so much to learn. So literally, do not waste time trying to build the app of your dreams at first. Instead, improve an already successful app, add your personality, copy others' distribution strategies, and only once you've acquired some experience with apps and distribution, then jump onto even more ambitious things. didn't even have a background there. That's the reality in 2026 is that this is possible. Your story is amazing. And it was so awesome to have you on and share all of this. I think people are going to love it. Thank you. It was my pleasure. Thanks to Mal for coming on. This is an amazing story. Really hope you are still here watching this right now. If you are, you're one of the OGs. This is one of those stories that happened just a few months ago. So you know what he's saying is working right now. It's not outdated information. This is super helpful. It shows the power of apps and how fast apps can truly grow. He built it without developer experience. He created content without content experience. And then he started crushing paid ads without experience. He learned all these things on the fly. This is the power of AI tools, not just for building, but for learning and for executing. If you're ready to build your app, again, shameless plug, definitely check out Starter Story Build. If you're serious about actually building something, want to come up with a good idea, execute it on it and ship it to real users to get real feedback. That's the only thing that matters. If you're serious about it, check it out. I put it in the link in the description. You can get started on your app right now. Okay, that's it for this episode. Thank you guys for watching. We'll see you in the next one. Peace.

Mau is a solo founder who built and grew his mobile app to $20K/month. This video is the complete playbook for building mobile apps in 2026: how he built it with AI, grew organically, and is scaling with paid ads. 

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Follow Mau: https://x.com/maubaron
Check out his app: https://www.prayerlock.com/

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This video is an educational case study of this founder’s experience. It is not financial advice and does not guarantee any income or results. Every business is different and your results may vary.