LayraApp — Reaction Trainer

Most reaction tests measure their own lag, not your reflexes. Layra times every tap to the exact display frame. Now with Harvest, an endless arcade run.

KNOW YOUR TRUE REACTION SPEED

Most reaction "tests" measure themselves, not you. They start the clock in a web page or a game loop and quietly add tens of milliseconds of lag — so the number you see is the app's delay, not your reflexes. Layra is built the opposite way.

Every stimulus is timed to the exact display frame that lights it up, and every tap is read from the raw hardware touch timestamp — the same approach used in cognitive research. On a 120 Hz iPhone that's single-frame accuracy. The number is you.

ONE SCORE: YOUR NEURAL RESPONSE SCORE A 90-second Calibrate turns your reflexes into one honest number, 0 to 1000. See where you land against global reference data, watch your trend move, and keep a daily streak. Your reflexes lead the score; memory, perception, and focus refine it.

17 GAMES ACROSS FOUR SYSTEMS Reflex — Reaction (tap on green), Choice (pick the side), Impulse (hold on red), Echo (tap the tone you hear), Pulse (tap the buzz you feel), Clash (tap the ink, not the word), Tilt (lean the phone), Pursuit (tap the crossing). Memory — Span (repeat the pattern), Flash (numbers, then masks), Echoes (match two back). Perception — Clock (feel ten seconds), Subito (count at a glance), Shade (spot the odd tile). Focus — Vigil (catch the rare target), Split (two things at once), Sums (sprint the math).

THE DAILY The same challenge for everyone on Earth, every day — fully offline. Four quick rounds, a streak to protect, and a spoiler-free grid to share. No numbers leaked, just your run.

DEEP SESSIONS A longer block with a measured start and finish, so you can see exactly how far your reactions drift as you tire.

DUEL A FRIEND Send a link. They race your "ghost" on the identical sequence. Lowest median wins — no servers, no accounts.

SEE EVERYTHING A sensory radar, 30-day trend lines, personal bests, and per-system breakdowns — all charted on device.

BUILT RIGHT • Fully offline. Works in airplane mode, forever. • No ads. No tracking. No analytics. No account. • Nothing you do ever leaves your phone. The only optional online feature is Apple's Game Center leaderboard. • Native SwiftUI for iPhone and iPad, iOS 17 and up. • Respects Reduce Motion, VoiceOver, and Dynamic Type.

Layra is a training and measurement tool, not a medical device, and makes no health claims.

Know your true reaction speed.