# Sub250: Reaction Time Test — Honest reflex benchmark in ms > Precise reaction time testing with device latency calibration. (iPhone/iPad app by Pierre Caporossi.) - Source: https://appshunter.io/ios/app/sub250-reaction-time-test/id6766965152 (this page in markdown: same URL + `.md`) - Developer: [Pierre Caporossi](https://appshunter.io/developer/1470803775) - Category: Utilities, Games, Action - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 16.4 · 58 MB - Languages: American English - Released: 2026-05-11 - Data updated: 2026-09-06 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/sub250-reaction-time-test/id6766965152/reviews.md ## What is Sub250? 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. 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. No accounts. No servers. No subscriptions. No ads. 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. ## Key features - Multiple reaction-time modes - Device latency calibration - Median score calculation - Anti-anticipation features - No accounts or servers - Local-only data storage ## Frequently asked questions about Sub250 ### What is Sub250's main purpose? Sub250 is designed to provide an honest benchmark of your reaction time in milliseconds. It focuses on measuring your true reflexes by calibrating your device's latency and using median scores. ### Does Sub250 have ads? No, Sub250 is completely ad-free. The app is designed to provide an uninterrupted experience for users focused on performance. ### How does Sub250 ensure accurate reaction time measurements? Sub250 calibrates your device's touch-to-display latency at startup and displays it with every score. It also uses the median of your last ten attempts, rather than a single best score, for more reliable results. ### What reaction-time modes are available in Sub250? Sub250 offers five distinct modes: Simple RT, F1 Lights Out, Go / No-Go, Choice RT, and Target Hunt. Each mode tests reflexes in a different, engaging way. ### Is Sub250 available on Android devices? Based on the provided data, Sub250 is currently supported on iPhones. Information regarding Android availability is not specified. ### Does Sub250 require an account or internet connection? No, Sub250 does not require any accounts or servers. All your sessions are stored locally on your device, ensuring privacy and no need for an internet connection. ### How often is Sub250 updated? The latest version of Sub250 is 1.0.8, which was last updated on September 1, 2026. This indicates a relatively recent update. ### What is the age rating for Sub250? Sub250 has an age rating of 4+. This suggests it is suitable for a wide range of users, including younger individuals. ## Version history (last 5 releases) ### 1.0.8 — 2026-09-01 Bug fixes and improvements. ### 1.0.7 — 2026-08-31 New trainer pack. • Sound Reflex — tap the instant you hear the tone • Haptics Reflex — tap the instant you feel the pulse • Loom — catch the orb as it kisses the ring • Track — burst a juking orb, bank time, chase a high score The five measurement modes are unchanged. Still latency-honest. ### 1.0.6 — 2026-08-13 Improvements and bug fixes. ### 1.0.5 — 2026-08-11 Improvements and bug fixes. ### 1.0.4 — 2026-08-04 Improvements and bug fixes. ## More apps by Pierre Caporossi - [Color Canvas: Tonalys](https://appshunter.io/ios/app/color-canvas-tonalys/id6748904992) - [Baby's Lullabies: Sopora](https://appshunter.io/ios/app/babys-lullabies-sopora/id6749226298) - [Kazu: Streak & Habit Tracker](https://appshunter.io/ios/app/kazu-streak-and-habit-tracker/id6756029676) All apps by Pierre Caporossi: https://appshunter.io/developer/1470803775 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-06.*