Sub250: Reaction Time Test
Honest reflex benchmark in ms
About
Measure your reflexes with precision using multiple modes. This app calibrates your device's latency for accurate results and focuses on median scores over luck. It's designed for competitive gamers who need to understand their true reaction speed.
What's New in Sub250
1.0.8
September 1, 2026
Bug fixes and improvements.
Developer apps
FAQ
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.