Niche index
App Store niches worth a look
Terms where Apple reports high search demand and no single company holds more than three of the top 10. Thinnest fields first. That makes a term worth a look, not open — each one’s own page says whether its top 10 is thin or already established. No invented score: every number here is one you can check on the App Store.
Have a specific app idea in mind?
Assess your idea’s App Store search opportunity with Apple-reported demand and observed competition.
- Health & FitnessHigh demandLightest third10 different developersblood pressure13.5K median ratings·6 charting·10 companies
Smallest in the top 5: 522 ratings at #3 (Free Blood Pressure Monitor™)
Top apps:
Blood Pressure Tracker SmartBP
Finger Blood Pressure: BP Mate
Free Blood Pressure Monitor™ - Health & FitnessHigh demandLightest thirdNone also charting10 different developersinterval timer14.2K median ratings·0 charting·10 companies
Smallest in the top 5: 6,147 ratings at #3 (Interval Timer Plus)
Top apps:
Interval Timer - Tabata Timer
Interval Timer □ HIIT Timer
Interval Timer Plus - Health & FitnessHigh demand10 different developerswater tracker56.5K median ratings·1 charting·10 companies
Smallest in the top 5: 24,191 ratings at #5 (My Water: Daily Drink Tracker)
Top apps:
Water tracker Waterllama
Water Reminder - Daily Tracker
Plant Nanny Cute Water Tracker - Health & FitnessHigh demand10 different developerssleep tracker59.5K median ratings·7 charting·10 companies
Smallest in the top 5: 7,932 ratings at #4 (Sleep Tracker: Recorder, Sound)
Top apps:
SleepWatch - Top Sleep Tracker
ShutEye®: Sleep Tracker, Sound
Sleep Cycle - Tracker & Sounds - Health & FitnessHigh demandsleep sounds62.8K median ratings·3 charting·9 companies
Smallest in the top 5: 3,511 ratings at #4 (Sleep Sounds - Relax & Sleep)
Top apps:
White Noise Deep Sleep Sounds
BetterSleep: Relax and Sleep
Rain Rain Sleep Sounds - Health & FitnessHigh demand10 different developerscalorie counter77.1K median ratings·7 charting·10 companies
Smallest in the top 5: 40,800 ratings at #3 (Calorie Counter by Numify)
Top apps:
Calorie Counter - MyNetDiary
MyFitnessPal: Calorie Counter
Calorie Counter by Numify - Health & FitnessHigh demand10 different developersperiod tracker87.7K median ratings·5 charting·10 companies
Smallest in the top 5: 77,766 ratings at #4 (Period Tracker by GP Apps)
Top apps:
Flo Cycle & Period Tracker
Period Tracker Period Calendar
Stardust Period Tracker - Health & FitnessHigh demand10 different developersheart rate88.8K median ratings·3 charting·10 companies
Smallest in the top 5: 9,021 ratings at #3 (Apple Health)
Top apps:
Instant Heart Rate: HR Monitor
Heart Rate Monitor - Pulse BPM
Apple Health - Health & FitnessHigh demand10 different developerscycle tracker94K median ratings·6 charting·10 companies
Smallest in the top 5: 97,534 ratings at #4 (My Cycle )
Top apps:
Flo Cycle & Period Tracker
Stardust Period Tracker
Clue Period & Cycle Tracker - Health & FitnessHigh demand10 different developersworkout tracker96K median ratings·5 charting·10 companies
Smallest in the top 5: 94,821 ratings at #2 (Hevy - Workout Tracker Gym Log)
Top apps:
Strong Workout Tracker Gym Log
Hevy - Workout Tracker Gym Log
Habit Tracker - Health & FitnessHigh demand10 different developerscalorie tracker124.7K median ratings·8 charting·10 companies
Smallest in the top 5: 98,665 ratings at #5 (Cronometer: Calorie Counter)
Top apps:
MyFitnessPal: Calorie Counter
Calorie Counter - MyNetDiary
Cal AI - Calorie Tracker - Health & FitnessHigh demand10 different developersfood tracker125.4K median ratings·8 charting·10 companies
Smallest in the top 5: 98,665 ratings at #5 (Cronometer: Calorie Counter)
Top apps:
MyFitnessPal: Calorie Counter
Calorie Counter - MyNetDiary
Cal AI - Calorie Tracker - Health & FitnessHigh demand10 different developersworkout planner136.6K median ratings·6 charting·10 companies
Smallest in the top 5: 108,524 ratings at #4 (Strong Workout Tracker Gym Log)
Top apps:
Fitbod: Gym & Fitness Planner
Gymverse: Gym Workout Planner
Workout for Women: Home & Gym - Health & FitnessHigh demand10 different developersstep counter154.9K median ratings·4 charting·10 companies
Smallest in the top 5: 11,474 ratings at #4 (Apple Fitness)
Top apps:
StepsApp Pedometer
Pacer Pedometer Step Counter
Steps - Activity Tracker - Health & FitnessHigh demandwhite noise169.7K median ratings·4 charting·8 companies
Smallest in the top 5: 46,037 ratings at #5 (White Noise)
Top apps:
White Noise Lite
White Noise Deep Sleep Sounds
Bedtime Fan: White Noise Baby
A term dropping off this list is not “solved” — a company entering with 4 or more of the top 10, or demand falling out of the top two bands, moves it below the bar. Nothing here predicts which comes next.