# ZeroIn: Reaction Time & Reflex — Stopwatch Timing Game Online > Stopwatch reflex game with timed challenges, online duels, and progression. (iPhone/iPad app by Emre ALTUN.) - Source: https://appshunter.io/ios/app/zeroin-reaction-time-and-reflex/id6788565326 (this page in markdown: same URL + `.md`) - Developer: [Emre ALTUN](https://appshunter.io/developer/1852335131) - Category: Games, Casual, Puzzle - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 15.0 · 54 MB - Languages: American English, Arabic, Dutch, French (France), German (Germany), Hindi, Indonesian, Italian, Japanese, Korean and 10 more - Released: 2026-07-20 - Data updated: 2026-10-04 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/zeroin-reaction-time-and-reflex/id6788565326/reviews.md ## What is ZeroIn? 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. ## Key features - Stopwatch timing challenges - Visible, vanishing, and blind timing modes - Math and time estimation targets - Online reflex duels with leaderboards - Monthly seasons with rewards - Boosters for assistance - Daily rewards and streaks ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Remove Ads | $3.99 | one-time | | ZeroIn Pro | $9.99 | one-time | | Life Refill | $1.99 | one-time | ## Frequently asked questions about ZeroIn ### What is ZeroIn? ZeroIn is a stopwatch reflex game where you stop a timer precisely on target. It offers over 300 levels with various timing mechanics, including vanishing digits and math targets. ### Does ZeroIn have ads? Yes, ZeroIn contains advertisements. Users can remove ads by purchasing ZeroIn Pro, which also offers unlimited lives and other benefits. ### Can I play ZeroIn with friends? Yes, ZeroIn features online reflex duels where you can invite friends with a link and compete in real-time against up to 12 players. ### What are the different timing modes in ZeroIn? ZeroIn offers visible clock timing, vibration beats, fully blind timing, countdowns, and vanishing digits that appear for two seconds before fading. ### How does ZeroIn track performance? Every stop in ZeroIn is measured in milliseconds. Players can earn up to three stars per level, with gold awarded for stops under 10 ms. ### Are there any special offers or rewards in ZeroIn? Yes, ZeroIn provides daily rewards for lives, boosters, and bonus stars, and helps save your streak if you miss a day. The top players in monthly seasons win champion frames and ZeroIn Pro. ### What devices does ZeroIn support? ZeroIn is available on iPhone and iPod devices, and is suitable for users aged 4 and up. ### How often is ZeroIn updated? The latest version of ZeroIn is 1.1.3, and it was last updated on October 3, 2026, indicating regular updates for new content and improvements. ## Version history (last 5 releases) ### 1.1.3 — 2026-10-03 • 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 ### 1.1.2 — 2026-09-15 Bug fixes and stability improvements. ### 1.1.1 — 2026-09-14 Bug fixes and stability improvements. ### 1.1.0 — 2026-09-09 We rewrote the heart of the game in this update. • Levels redesigned from scratch. Richer rounds, shorter waits — no more dead time between turns. • Three new game types: math, time estimation and the vanishing number. • Take on bots. Even when the lobby is quiet, you can start playing right away. • Seasons are here: a fresh ranking every month, rewards for the top three. • Brand new START buttons. Collect stars, unlock, choose. • Fixed rematch and connection issues in online matches. Have fun! ### 1.0.6 — 2026-07-20 No release notes. ## Apps similar to ZeroIn | App | Rating | Price | Category | | --- | --- | --- | --- | | [StopTime: Timer Reaction Game](https://appshunter.io/ios/app/stoptime-timer-reaction-game/id6772400704) | — | Free | Games | | [Tiiime : The Game](https://appshunter.io/ios/app/tiiime-the-game/id6758630789) | — | Free | Games | | [Red Dot — Reaction Game](https://appshunter.io/ios/app/red-dot-reaction-game/id6762041530) | — | Free | Games | | [On Time - Timer Game](https://appshunter.io/ios/app/on-time-timer-game/id6758968921) | 4.5 (24) | Free | Games | | [10 Sec Challenge-SurpriseTimer](https://appshunter.io/ios/app/10-sec-challenge-surprisetimer/id6743366168) | — | Free | Games | | [Timer Challenge - Perfect Stop](https://appshunter.io/ios/app/timer-challenge-perfect-stop/id6772625649) | — | Free | Games | ## More apps by Emre ALTUN - [Vocamate](https://appshunter.io/ios/app/vocamate/id6755159071) All apps by Emre ALTUN: https://appshunter.io/developer/1852335131 ## Related topics [timed games question](https://appshunter.io/ios/topics/timed-games-question) · [happy time games](https://appshunter.io/ios/topics/happy-time-games) · [scum time](https://appshunter.io/ios/topics/scum-time) · [perfect game timing](https://appshunter.io/ios/topics/perfect-game-timing) · [neki time](https://appshunter.io/ios/topics/neki-time) · [time killer games](https://appshunter.io/ios/topics/time-killer-games) · [half life hero](https://appshunter.io/ios/topics/half-life-hero) · [budge gametime](https://appshunter.io/ios/topics/budge-gametime) · [mr time](https://appshunter.io/ios/topics/mr-time) · [matching games no timer](https://appshunter.io/ios/topics/matching-games-no-timer) · [time killer game](https://appshunter.io/ios/topics/time-killer-game) · [togglematrix](https://appshunter.io/ios/topics/togglematrix) · [game for time](https://appshunter.io/ios/topics/game-for-time) · [play time code](https://appshunter.io/ios/topics/play-time-code) · [match games no timer](https://appshunter.io/ios/topics/match-games-no-timer) · [match game no timer](https://appshunter.io/ios/topics/match-game-no-timer) · [7 second challenge generator](https://appshunter.io/ios/topics/7-second-challenge-generator) · [sd timing go](https://appshunter.io/ios/topics/sd-timing-go) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-04.*