ZeroIn: Reaction Time & Reflex
Stopwatch Timing Game Online
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Can you stop the clock at exactly 10.00? 300+ levels, hidden timers and live online tables. Test your reflexes — a new season starts every month.
ZeroIn is a stopwatch reflex game: the clock runs and you stop it exactly on target. Sounds easy — until the timer disappears.
300+ LEVELS
• Visible clock, vibration beats, fully blind timing and countdowns
• Vanishing digits that show for two seconds, then fade away
• Math targets: if it's 3 × 2, stop the clock at 6.00
• Time estimation: feel 7.35 seconds without seeing a single digit
TEST YOUR REACTION TIME
Every stop is measured in milliseconds. Earn up to three stars, chase gold (under 10 ms) and unlock new START buttons with your points.
ONLINE REFLEX DUELS
• Real-time tables with up to 12 players
• Invite friends with a link and rematch in seconds
• Climb the global ranking and the monthly season
MONTHLY SEASONS
The top three of every season win a champion frame and a full month of ZeroIn Pro.
BOOSTERS
Second Chance, Slow-Mo, Reveal Timer and Second Buzz help you through the toughest levels.
DAILY REWARDS
Come back every day for lives, boosters and bonus stars — and save your streak if you miss a day.
ZeroIn Pro: no ads, unlimited lives, double star points and the Black Hole button.
Ratings & Reviews
• Boosters: Second Chance, Slow-Mo, Reveal Timer and Second Buzz
• Daily rewards — and a way to save your streak
• Season rewards: the top three get a month of Pro
• See your ranking climb right after an online win
• Minimize your table and play solo while friends join
• Fewer, smarter notifications and many fixes
The developer, Emre ALTUN, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- User Content
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Emre ALTUN
- Size
- 56.9 MB
- Category
- Casual
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 19 more
- English, Arabic, Dutch, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Malay, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Thai, Traditional Chinese, Turkish, Vietnamese
- Age Rating
4+
- 4+
- Contains
Advertising
User-Generated Content
- In-App Purchases
Yes
- Life Refill $0.99
- ZeroIn Pro $4.99
- Remove Ads $1.99
- Copyright
- © 2026 Emre Altun. All rights reserved.