The question is not which idea. It is which niche already pays a developer who has one app and no portfolio behind it. We went through 4,000 niches and kept the ones where that developer exists in the $20k+ bands, where no publisher holds more than two apps, and where apps launched in the last 18 months already hold 15% or more of the niche's review pace. Twenty made it, games excluded. Each one names the developer who did it.
"One-app developer" below means a developer with no other app in the 50,000-app catalog.
| Niche | Apps | New | Take | Opening | Demand | Floor | |
|---|---|---|---|---|---|---|---|
| 1 | Camera pulse with a vitals journal | 93 | 26 | 18% | Open | 100 | $2.0M+ |
| 2 | Workout loggers & trackers | 96 | 17 | 19% | Fewer newcomers | 89 | $1.1M+ |
| 3 | Photo-scan calorie counters | 138 | 60 | 15% | Open | 100 | $2.2M+ |
| 4 | Alarms with a mission menu | 25 | 17 | 70% | Open | 96 | $500k+ |
| 5 | Player prop research | 22 | 7 | 22% | Open | 78 | $450k+ |
| 6 | Hotel-room spy-cam kits | 64 | 16 | 15% | Open | 80 | $710k+ |
| 7 | Cleaners with a security scan | 19 | 11 | 81% | Open | 81 | $290k+ |
| 8 | Always-on family circles | 46 | 17 | 31% | Open | 82 | $580k+ |
| 9 | Trend effects from one photo | 61 | 29 | 17% | Open | 100 | $1.6M+ |
| 10 | AI golf swing analysis from video | 12 | 4 | 65% | Open | 66 | $280k+ |
| 11 | Viral trend photo styles | 19 | 12 | 57% | Open | 78 | $310k+ |
| 12 | AI room redesign from a photo | 81 | 40 | 24% | Open | 100 | $1.2M+ |
| 13 | Earn screen time with real-life habits | 12 | 10 | 100% | Open | 91 | $450k+ |
| 14 | ASL lesson courses | 13 | 4 | 26% | Open | 89 | $390k+ |
| 15 | Camera roll cleaners | 46 | 30 | 53% | Open | 85 | $380k+ |
| 16 | Schedule-and-limit app blockers | 28 | 6 | 42% | Fewer newcomers | 87 | $300k+ |
| 17 | AI Bible chat companions | 16 | 6 | 21% | Open | 100 | $770k+ |
| 18 | Multi-game TCG scanners | 22 | 17 | 77% | Open | 96 | $370k+ |
| 19 | All-round AI meeting note takers | 36 | 17 | 19% | Open | 90 | $1.1M+ |
| 20 | Photoshoots of you in any setting | 27 | 10 | 27% | Open | 91 | $640k+ |
New is apps launched in the last 18 months. Take is the share of the niche's current review pace those new apps hold. Floor adds the band floors of the researched apps in the niche, a month, rounded down; with one or two researched apps it shows the top band instead. Numbers as of 2026-08-30.
The list
1. Camera heart rate monitors
Finger on the lens, pulse on screen, a vitals journal behind it. 93 apps from 90 developers, 24 over $20k a month, 15 of those from one-app developers. Heartify, one app, 119,041 ratings, $250k+ band. The complaint in all twelve leaders: the listing promised blood pressure. Read the niche.
2. Workout loggers
Sets, reps, weight, rest timer. 96 apps from 95 developers, 18 over $20k, 13 from one-app developers. Lyfta and Setgraph, one app each, both at $50–250k. The angles that run: no account and no sign-up survey in seven apps, pay once in five.
3. Photo-scan calorie counters
Photograph the plate, get the macros. 138 apps from 137 developers, 31 over $20k, 11 from one-app developers. Lifesum, one app, 150,364 ratings, $250k+. Sixty apps launched in the last 18 months. Read the niche.
4. Alarm clocks with missions
Solve the puzzle or the alarm keeps ringing. 25 apps from 25 developers, 10 over $20k, 7 from one-app developers. Alarmy, one app, 242,097 ratings. Wayk launched February 2026 and already holds 18,252 ratings at $50–250k. Newcomers hold 70% of the pace. Read the niche.
5. Player prop research
Hit rates, matchups, no wagers taken. 22 apps from 22 developers, 8 over $20k, 7 from one-app developers. Outlier, Linemate and Props.Cash, one app each, all at $50–250k. PickFinder launched October 2025 and is already there.
6. Hidden camera detectors
Scan the hotel room. 64 apps from 64 developers, 11 over $20k, 7 from one-app developers. Cam Detector App, one app, 15,641 ratings, $50–250k. Fifty listings run the hotel-room pitch; six scan the Wi-Fi for strangers.
7. Cleaners with a security scan
Storage cleanup plus a breach check and a Wi-Fi scan. 19 apps from 19 developers, 9 over $20k, 7 from one-app developers. AI CleanKit launched September 2025, 10,911 ratings, $20–50k. Newcomers hold 81% of the pace.
8. Family location circles
Where the kids are, always on. 46 apps from 46 developers, 13 over $20k, 6 from one-app developers. Phone Tracker from ZED, one app, 12,164 ratings, $50–250k. Three apps alert when the teen driver speeds.
9. Trend effects from one photo
One photo in, the moving clip that is trending this week out. 61 apps from 60 developers, 21 over $20k, 6 from one-app developers. Art Pics, one app, 56,392 ratings, $50–250k. Twenty-nine launched in the last 18 months.
10. AI golf swing analysis
Film the swing, get graded against a tour pro. 12 apps from 12 developers, 5 over $20k, all five from one-app developers. Sparrow, Swing Coach, Scratch AI and Mustard, one app each, all at $50–250k. Newcomers hold 65% of the pace.
11. Viral photo styles
The figurine, the holiday look, this month's filter. 19 apps from 19 developers, 7 over $20k, 5 from one-app developers. DigiArt, one app, 12,180 ratings, $50–250k. VStyle launched February 2026 and is already at $50–250k.
12. AI room redesign
Photo the room, see it restyled. 81 apps from 81 developers, 17 over $20k, 5 from one-app developers. AI Remodel, one app, 22,150 ratings, $50–250k. Forty launched in the last 18 months. Read the niche.
13. Earn screen time with habits
Do the workout, unlock the feed. 12 apps from 12 developers, 4 over $20k, all four from one-app developers. Unrot launched June 2025, holds 56,657 ratings, $250k+ band. Unglue launched January 2026 and is at $50–250k. Ten of the twelve apps in the niche are under 18 months old.
14. ASL lesson courses
Duolingo for sign language. 13 apps from 13 developers, 5 over $20k, 4 from one-app developers. Lingvano, one app, 114,466 ratings, $250k+. Pocket Sign, one developer, 38,219 ratings, $20–50k.
15. Camera roll cleaners
Swipe the duplicates away. 46 apps from 45 developers, 4 over $20k, all four from one-app developers. KeepClean AI launched October 2025, 5,399 ratings, $50–250k. Thirty launched in the last 18 months and hold 53% of the pace.
16. App blockers with schedules
Block the apps you name, on the schedule you set. 28 apps from 28 developers, 7 over $20k, 4 from one-app developers. Opal, one app, 86,042 ratings. Refocus, one app, 10,754 ratings, $20–50k. Seven listings promise a blocker you cannot cheat.
17. AI Bible chat
Ask scripture a question, get a verse and a prayer. 16 apps from 16 developers, 6 over $20k, 4 from one-app developers. Haven, one app, 147,112 ratings, $250k+. Creed launched August 2025, one app, 55,031 ratings, $250k+. Read the niche.
18. Multi-game card scanners
Scan the card, price it, across every game. 22 apps from 22 developers, 6 over $20k, 3 from one-app developers. Collectr, one app, 60,820 ratings, $50–250k. HoloDex launched September 2025, one app, 20,660 ratings, $50–250k. Newcomers hold 77% of the pace.
19. AI meeting notes
Record, transcribe, summarize. 36 apps from 36 developers, 10 over $20k, 3 from one-app developers. Minutes AI and Wave, one app each, 14,009 and 11,783 ratings, both $250k+. Three listings sell a lifetime unlock instead of a weekly plan.
20. Photoshoots anywhere
Studio headshots from selfies, no studio. 27 apps from 27 developers, 9 over $20k, 3 from one-app developers. MyMood AI, one app, 7,430 ratings, $50–250k. Sixteen listings run the headshot pitch.
What the twenty have in common
Every app in every niche above is from a different developer, or at most two share one. No portfolio publisher stacks the chart. That is the filter, and it is what makes the leader a developer you could be.
Weekly plans dominate, and the angles that run against them are countable: pay once in five workout loggers, a lifetime unlock in three meeting-note apps, no account in seven loggers.
Eight of the twenty have an app launched in 2025 or 2026 already in the $50–250k band or above: Wayk, PickFinder, VStyle, Unrot, Unglue, KeepClean AI, Creed, HoloDex.
How we picked
From 4,000 niches: at least 12 apps, at least three apps over $20k a month, no developer with more than two apps in the niche, apps launched in the last 18 months holding at least 15% of the niche's review pace, games excluded. Then ranked by how many of the $20k+ apps come from one-app developers. Numbers as of the catalog date on each row.
FAQ
What app should a solo developer build in 2026?
One in a niche where a developer with one app already sits in the $20k+ bands and no publisher holds the chart. The twenty above qualify. Camera heart rate monitors have fifteen such developers, workout loggers thirteen, photo-scan calorie counters eleven.
Can a solo developer still make money on the App Store?
Yes, by count. In these twenty niches, 123 apps from one-app developers sit in the $20k+ bands, ten of them at $250k+. Eight apps launched in 2025 or 2026 are already at $50–250k or above.
Which app niches have the least competition from big publishers?
The twenty above, by construction: no developer holds more than two apps in any of them. For the opposite case, coin identifiers and plant identifiers are led by publishers with 20 to 28 apps each.
How do I check a niche before building?
Open it in Appaloma: the readings, the leaders with their prices, the angles by app count, and the one star reviews pooled across the top twelve. The method is in Pick a niche.