Starter Story · 2026-01-18
I Grew My Mobile App to $20K/Month: Here’s My Entire Playbook
Solo founder Mau Baron built Prayerlock, an iOS app that blocks your phone until you recite an AI-generated prayer, in 3 days with Cursor and ChatGPT after spotting competitor PrayScreen. Organic UGC reaction+demo videos (his girlfriend, then a second creator) got it to $1.5-2.4K/month; a 15-minute onboarding tripled conversion; broad TikTok ads and then Spark Ads on a 15-year-old creator's videos took it from $10K (Oct) to $15K (Nov) to $21K (Dec 2025), spending ~$9K/month at $1.88 per trial. 58K downloads, 6.7K ratings.
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Numbers mentioned
| Who | Metric | Value | Context | When |
|---|---|---|---|---|
| Prayerlock | revenue | USD 21K/month | Sales in December 2025 (dashboard) | 1:31 |
| Prayerlock | revenue | USD 15K/month approximate | 9:25 | |
| Prayerlock | revenue | USD 10K/month approximate | 9:25 | |
| Prayerlock | revenue | USD 1,500/month approximate | 7:25 | |
| Prayerlock | revenue | USD 2,400/month approximate | 7:25 | |
| Prayerlock | revenue | USD 40K/month projection | Expected January 2026 revenue | 9:25 |
| Prayerlock | growth rate | +50%/month approximate | Monthly revenue growth, 'over 50%' | 1:31 |
| Prayerlock | downloads | 58K downloads approximate | In ~6 months since launch | 1:31 |
| Prayerlock | conversion rate | 43% | Stated as 'a conversion rate of 43%' with no from/to step given | 1:31 |
| Prayerlock | arpu | USD 23.6per paying user | App Store proceeds per paying user | 1:31 |
| Prayerlock | revenue | USD 41K | Total App Store proceeds (after Apple's cut) since launch | 1:31 |
| Prayerlock | conversion rate | 12% approximate | Review rate: ratings per download ('over 12%'); 6.7K ratings on under 60K downloads | 1:31 |
| Prayerlock | count | 6,700 ratings approximate | App Store ratings, averaging 4.9 stars | 1:11 |
| Prayerlock | rank | 22 rank | App Store Reference category | 1:31 |
| Prayerlock | price | USD 49.99/year | Yearly plan | 1:31 |
| Prayerlock | price | USD 9.99/week | Weekly plan | 1:31 |
| Prayerlock | time to milestone | 3 days approximate | Time to code the app with AI; App Store approval then took over a week | 4:00 |
| Prayerlock | activity volume | 40 posts/day approximate | Early format testing across 12 accounts | 7:25 |
| Prayerlock | views | 10K views/day approximate | From the single girlfriend UGC account; enough to reach the first $1K/month | 7:25 |
| Prayerlock | downloads | 200–300 downloads/day approximate | From ~10K organic views/day of reaction+demo videos | 7:25 |
| Prayerlock | views | 20K viewsper video approximate | First breakout video on the second UGC creator's account, after 14 days of posting | 7:25 |
| Prayerlock | conversion rate | +3 x approximate | Organic conversion rate 'more than 3X' after lengthening onboarding from 5 to 15 minutes | 9:25 |
| Prayerlock | ad spend | USD 20/day | Starting budget on Meta, and again on TikTok | 9:25 |
| Prayerlock | cpa | USD 10per trial start approximate | Meta ads at $20/day after the onboarding fix | 9:25 |
| Prayerlock | cpa | USD 4per trial start approximate | Broad US TikTok campaign with top UGC reaction videos at $20/day; yearly plan costs ~$50 | 9:25 |
| Prayerlock | ad spend | USD 4,000 approximate | All of the founder's savings, put into TikTok ads, around October 2025 | 9:25 |
| Prayerlock | views | 10K viewsper video approximate | Consistent organic views per video from creator Matthew | 9:25 |
| Prayerlock | cpa | USD 3per trial start approximate | TikTok Spark Ads on creator Matthew's organic videos | 9:25 |
| Prayerlock | ad spend | USD 6,000 approximate | Spark Ads on Matthew's videos, partly on debt, in November 2025 | 9:25 |
| Prayerlock | ad spend | USD 360/day | 14:59 | |
| Prayerlock | ad spend | USD 9,000/month approximate | December 2025 spend against ~$20K revenue | 14:59 |
| Prayerlock | cpa | USD 1.88per trial start | Blended cost per trial at ~$360/day spend | 14:59 |
| benchmarkMinimum download-to-trial conversion before scaling paid ads (founder's rule of thumb) | conversion rate | 10% estimate | download -> trial | 11:49 |
| benchmarkRevenue threshold for a niche worth entering, per Sensor Tower estimates (founder's rule of thumb) | revenue | USD 50K/month estimate | Look for niches with apps above this | 11:49 |