Layra
Your true reaction time, measured to the frame.
Most reaction tests measure their own lag as much as your reflexes. Layra reads stimulus onset from the display's own frame clock and your response from the raw touch timestamp, so what you get back is your number — not the app's overhead. Seventeen games across reflex, memory, perception and focus, all of it offline.
- iOS 17+
- iPhone · iPad
- Health & Fitness
- 4+
- Free
What it does
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Measured, not estimated
Stimulus onset comes from the display link's target timestamp for the frame that actually draws it; your response comes from the raw touch event. No timers, no gesture recognisers, no guesswork — single-frame accuracy at 120 Hz.
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One number, honestly built
The Neural Response Score puts you on a 0–1000 scale from a 90-second calibration. Reflex carries the composite, with memory, perception and focus weighted in from your recent runs.
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Seventeen games, four systems
Reflex, memory, perception and focus — from simple reaction and choice to Stroop interference, span recall, and divided attention.
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The Daily
The same challenge for everyone on Earth, every day, computed on your device with no server involved. Four rounds, a streak to protect, and a spoiler-free grid to share.
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Duel a friend
Send a link and they race your ghost over an identical sequence. The whole challenge travels inside the link — there's nothing to sign up for.
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See the drift
Deep Sessions measure your start and end segments separately, so you can watch fatigue land. Trends, personal bests and a sensory radar, charted on device.
Privacy
What this app collects
Nothing you measure leaves your device. Two things use the network and both need you to be online: an optional Game Center score submission — a single number — and the ad Google serves between runs, never during one.
| Data type | Category | Used for |
|---|---|---|
| Device ID | Identifiers | Third-Party Advertising |
| Advertising Data | Usage Data | Third-Party Advertising |
| Product Interaction | Usage Data | Third-Party Advertising, Analytics |
| Crash Data | Diagnostics | Third-Party Advertising |
| Performance Data | Diagnostics | Third-Party Advertising |
- Used to personalise ads across other companies' apps and websites. iOS asks your permission first, and the app works the same if you decline.
- Not linked to your identity.
Handled by Google AdMob under their own privacy policy.
Read the full policy