Aim Trainer & Reflex: Zerotick

Zerotick is the aim trainer and reaction time test that measures honestly. Five modes train your reflexes, your aim and your eyes, and every number you see is the real time between the picture and your tap. No account, no ads, and training works offline.

FIVE MODES, ONE SCORE
- Start Lights: five red racing start lights, then the lights go out. Tap as fast as you can. A tap below 100 ms counts as a false start, like in athletics.
- Color Switch: the screen changes color, you tap. Pure reflex test.
- Aim Trainer: 20 targets, your hit rate and your time. Every miss costs 150 ms, so sloppy tapping does not pay.
- Sequence: tap the numbers 1 to 9 in order, as fast as you can.
- Peripheral: look at the cross in the middle and tap the side where something appears. Trains your peripheral vision.

HONEST MEASUREMENT
- The stimulus time is the moment the picture was really drawn on the screen (on Android 13 and newer, the display time reported by the system).
- Your tap is stamped with the hardware timestamp of the touch event.
- If a frame reaches the display late, the delay reported by Android is added. If it is too uncertain, the attempt is repeated instead of showing you a wrong number.
- The device check "Measurement chain" shows your refresh rate in Hz, dropped frames and the touch sampling rate, so you know what your phone can do.
- Uses the highest refresh rate of your phone during tests, for example 120 Hz.

RANKS, BADGES AND THE DAILY CHALLENGE
- Climb through the ranks Rookie, Kart, Club, Pro, Elite and Pole.
- 12 badges to collect.
- The daily challenge is the same for everyone in the world (same seed), with 3 attempts per day and a streak that keeps you coming back. Free in all modes.
- Local leaderboard with your own best times and your duel opponents.

DUELS WITHOUT A SERVER
Send the duel link "Beat my time" to a friend. Both play the same seed, so the comparison is fair. No server, no sign-up. The leaderboard on this phone covers you and your duel opponents.

MADE FOR EVERYONE
- Color blind mode with blue and yellow plus a ring around the target.
- No account, no ads. No third-party ad or analytics SDKs, only anonymous usage counters without a device ID. Your own entries stay on your phone.

FREE AND PRO
Free: Start Lights, Color Switch, the leaderboard, the daily challenge in all modes, accepting duels, and sending 1 duel per day.
Zerotick Pro: Aim Trainer, Sequence and Peripheral modes, history with trend and consistency, unlimited duels. Monthly or yearly. You can cancel any time in Google Play.

Whether you want a quick reflex test on the bus, a daily aim trainer routine or a fair duel against a friend: Zerotick shows what your reaction time really is.

Questions or ideas: info@saracai.de

Recent changes:
- Pro page: the purchase area stays fixed at the bottom; prices show a loading state and a "Reload" button if Google Play is unreachable; the connection is restored after an interruption.
- A double tap starts only one purchase, and "Restore purchase" tells you the real result.
- The trial reminder is only set after a confirmed trial purchase; the farewell offer appears only once.