Sub250: Reaction Time Test
Not in any tracked top chart right now.
Updated 25 Oct 2026 · rankings refresh through the day
DeveloperPierre Caporossi
CategoryGames
PriceFree
Released
Rating★ 4.7 (6)
Version1.1.1
Age rating4+
First seen by us
24 Oct 2026
24 Oct 2026Installs (est.)5k+ worldwide
Rating
4.7 ★
6 ratings
Measured
Sub250: Reaction Time Test on the App Store
App details
App ID
6766965152
Publisher
Pierre Caporossi
On the store since
May 2026
Under a year
Minimum OS
iOS 16.4+
iPhone 8 and later
Devices
iPhone · iPad
Content rating
4+
Languages
1
EN
Size
52 MB
Also listed in
Utilities, Action
Sub250: Reaction Time Test downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. iPhone downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
4.7 ★
6 ratings
Measured
Ratings
6
Measured
About Sub250: Reaction Time Test
Five reaction-time modes with native iOS timing. Your device's latency floor shows next to every score in ms. What's reflex, what's hardware. Free.
Sub250 measures your reflexes the way they should be measured. The headline number is the median of your last ten attempts, not your luckiest tap, with millisecond-level precision and your device's calibrated latency floor shown alongside every score.
FIVE REACTION-TIME MODES
• Simple RT: wait for green, tap as fast as you can.
• F1 Lights Out: five red lights, then go, exactly like the grid.
• Go / No-Go: tap green, hold red. The clock catches you if you flinch.
• Choice RT: four zones, react to whichever lights up.
• Target Hunt: tap pop-up targets in random spots before they fade. Thirty seconds.
WHY SUB250 IS DIFFERENT
Latency-honest. Every device adds touch-to-display latency. Sub250 calibrates yours in about three seconds at startup and shows the floor in milliseconds next to every score. We think every reaction-test app should.
Median-of-10. The score reflects skill, not variance. Best-of-N is available as a secondary number, never the headline.
Anti-anticipation. Randomized stimulus intervals on every interval-based mode. Jumpstarts cost a re-arm. The clock is honest.
100% free. No accounts. No servers. No subscriptions. No ads. No in-app purchases. Ever.
Local-only. Your sessions never leave your device. There is no leaderboard to game, no profile to fill out, no email to give up.
BUILT FOR COMPETITIVE GAMERS
If you play Counter-Strike, Valorant, Apex, racing sims, or anything else where the difference between 200 and 230 ms matters, Sub250 was built for you. The score is the score.
Open Sub250, run the calibration, and see what your real reflex looks like.
Sub250 measures your reflexes the way they should be measured. The headline number is the median of your last ten attempts, not your luckiest tap, with millisecond-level precision and your device's calibrated latency floor shown alongside every score.
FIVE REACTION-TIME MODES
• Simple RT: wait for green, tap as fast as you can.
• F1 Lights Out: five red lights, then go, exactly like the grid.
• Go / No-Go: tap green, hold red. The clock catches you if you flinch.
• Choice RT: four zones, react to whichever lights up.
• Target Hunt: tap pop-up targets in random spots before they fade. Thirty seconds.
WHY SUB250 IS DIFFERENT
Latency-honest. Every device adds touch-to-display latency. Sub250 calibrates yours in about three seconds at startup and shows the floor in milliseconds next to every score. We think every reaction-test app should.
Median-of-10. The score reflects skill, not variance. Best-of-N is available as a secondary number, never the headline.
Anti-anticipation. Randomized stimulus intervals on every interval-based mode. Jumpstarts cost a re-arm. The clock is honest.
100% free. No accounts. No servers. No subscriptions. No ads. No in-app purchases. Ever.
Local-only. Your sessions never leave your device. There is no leaderboard to game, no profile to fill out, no email to give up.
BUILT FOR COMPETITIVE GAMERS
If you play Counter-Strike, Valorant, Apex, racing sims, or anything else where the difference between 200 and 230 ms matters, Sub250 was built for you. The score is the score.
Open Sub250, run the calibration, and see what your real reflex looks like.
Latest updates
1.1.1
Bug fixes and improvements.