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. For an idea that is not on this list the free lookup names the niche and shows who already holds it.
| 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 | 41% | 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 2026-09-01.
The list
1. Camera heart rate monitors
A finger on the lens puts a pulse on screen and a vitals journal behind it. 93 apps come from 90 developers, 24 clear $20k a month and 15 of those belong to one-app developers. Heartify runs one app with 119,041 ratings in the $250k+ band. All twelve leaders share one complaint: the listing promised blood pressure.
2. Workout loggers
These apps log sets, reps and weight and run a rest timer. 96 apps come from 95 developers, 18 clear $20k and 13 of those belong to one-app developers. Lyfta and Setgraph run one app each and both sit at $50–250k. Two angles run against the weekly plan: 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 come from 137 developers, 31 clear $20k and 11 of those belong to one-app developers. Lifesum runs one app with 150,364 ratings at $250k+, and sixty apps launched in the last 18 months.
4. Alarm clocks with missions
Solve the puzzle or the alarm keeps ringing. 25 apps come from 25 developers, 10 clear $20k and 7 of those belong to one-app developers. Alarmy runs one app with 242,097 ratings. Wayk launched February 2026 and already holds 18,252 ratings at $50–250k. Newcomers hold 70% of the pace.
5. Player prop research
These apps show hit rates and matchups and take no wagers. 22 apps come from 22 developers, 8 clear $20k and 7 of those belong to one-app developers. Outlier, Linemate and Props.Cash run one app each and all three sit at $50–250k. PickFinder launched October 2025 and is already there.
6. Hidden camera detectors
Scan the hotel room. 64 apps come from 64 developers, 11 clear $20k and 7 of those belong to one-app developers. Cam Detector App runs one app with 15,641 ratings at $50–250k. Fifty listings run the hotel-room pitch; six scan the Wi-Fi for strangers.
7. Cleaners with a security scan
These apps clear storage and add a breach check and a Wi-Fi scan. 19 apps come from 19 developers, 9 clear $20k and 7 of those belong to one-app developers. AI CleanKit launched September 2025 and holds 10,911 ratings at $20–50k. Newcomers hold 81% of the pace.
8. Family location circles
The map shows where the kids are and stays on. 46 apps come from 46 developers, 13 clear $20k and 6 of those belong to one-app developers. Phone Tracker from ZED runs one app with 12,164 ratings at $50–250k. Three apps alert when the teen driver speeds.
9. Trend effects from one photo
One photo goes in and the moving clip trending this week comes out. 61 apps come from 60 developers, 21 clear $20k and 6 of those belong to one-app developers. Art Pics runs one app with 56,392 ratings at $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 come from 12 developers and 5 clear $20k, all five from one-app developers. Sparrow, Swing Coach, Scratch AI and Mustard run one app each and all four sit at $50–250k. Newcomers hold 65% of the pace.
11. Viral photo styles
These apps sell the figurine, the holiday look and this month's filter. 19 apps come from 19 developers, 7 clear $20k and 5 of those belong to one-app developers. DigiArt runs one app with 12,180 ratings at $50–250k. VStyle launched February 2026 and is already at $50–250k.
12. AI room redesign
Photo the room, see it restyled. 81 apps come from 81 developers, 17 clear $20k and 5 of those belong to one-app developers. AI Remodel runs one app with 22,150 ratings at $50–250k, and forty launched in the last 18 months.
13. Earn screen time with habits
Do the workout, unlock the feed. 12 apps come from 12 developers and 4 clear $20k, all four from one-app developers. Unrot launched June 2025 and holds 56,657 ratings in the $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
These apps teach sign language the way Duolingo teaches Spanish. 13 apps come from 13 developers, 5 clear $20k and 4 of those belong to one-app developers. Lingvano runs one app with 114,466 ratings at $250k+, and Pocket Sign holds 38,219 ratings at $20–50k from one developer.
15. Camera roll cleaners
Swipe the duplicates away. 46 apps come from 45 developers and 4 clear $20k, all four from one-app developers. KeepClean AI launched October 2025 and holds 5,399 ratings at $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 come from 28 developers, 7 clear $20k and 4 of those belong to one-app developers. Opal runs one app with 86,042 ratings and Refocus one app with 10,754 ratings at $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 come from 16 developers, 6 clear $20k and 4 of those belong to one-app developers. Haven runs one app with 147,112 ratings at $250k+, and Creed launched August 2025 and holds 55,031 ratings on one app at $250k+.
18. Multi-game card scanners
Scan the card, price it, across every game. 22 apps come from 22 developers, 6 clear $20k and 3 of those belong to one-app developers. Collectr runs one app with 60,820 ratings at $50–250k, and HoloDex launched September 2025 and holds 20,660 ratings on one app at $50–250k. Newcomers hold 77% of the pace.
19. AI meeting notes
Record, transcribe, summarize. 36 apps come from 36 developers, 10 clear $20k and 3 of those belong to one-app developers. Minutes AI and Wave run one app each with 14,009 and 11,783 ratings and both sit at $250k+. Three listings sell a lifetime unlock instead of a weekly plan.
20. Photoshoots anywhere
These apps turn selfies into studio headshots without the studio. 27 apps come from 27 developers, 9 clear $20k and 3 of those belong to one-app developers. MyMood AI runs one app with 7,430 ratings at $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
We cut 4,000 niches down to those with at least 12 apps, at least three apps over $20k a month, no developer holding more than two apps in the niche, and apps launched in the last 18 months holding at least 15% of the niche's review pace, with games excluded. We then ranked what survived by how many of the $20k+ apps come from one-app developers. The numbers are 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.