1/2 one-half
Keep guessing one-half.
Free · Designed for iPad. Not verified for macOS.
Rebuilt for 2.0.0: a new design, hit / miss effects and the same one-tap L or R play. Your last streak stays readable, Redo can be switched off and records carry over.
Keep picking 1/2 and chase the odds that almost never happen!
A simple game: how many times in a row can you call a 50/50 correctly?
■ How to play
・Pick one of two: "L" or "R"
・On a hit, the probability of your streak so far is shown (1/2 → 1/4 → 1/8 …)
・On a miss, the streak goes into RECORDS and you start over
・Once per streak you can watch an ad to redo your choice (the answer is drawn again). Redo can be switched ON / OFF
■ Records
・RECORDS: how many times you reached each streak, and your total runs
・HISTORY: the winning side of your last 13 picks
■ Version 2.0.0 (complete remake)
・Rebuilt from the ground up with a new design
・Added hit / miss effects and haptic feedback
・After a miss, your last streak stays readable
・Redo is only offered when an ad is ready
・Supports iPad and larger text sizes
・Your existing records carry over
This app shows ads (banner, interstitial and rewarded).
Terms of Use: https://www.gravass.co.jp/apps/terms/
Privacy Policy: https://www.gravass.co.jp/apps/privacy/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Rebuilt from the ground up.
・New design: refreshed L / R tiles, HISTORY and RECORDS, plus hit / miss effects and haptics
・After a miss, your last streak stays readable
・Redo (watch an ad) can be switched ON / OFF and is only offered when an ad is ready
・Supports iPad and larger text sizes
・Your existing records carry over
※ This version requires iOS 16.4 or later
Feedback and bug reports are welcome via reviews or our website.
The developer, gravass, Inc., 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:
- Location
- Identifiers
- Usage Data
- Diagnostics
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- GRAVASS, INC.
- Size
- 51.5 MB
- Category
- Casual
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - iPad
Requires iPadOS 16.4 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 Japanese
- Age Rating
9+
- 9+
- Infrequent
Cartoon or Fantasy Violence
Guns or Other Weapons
Contains
Advertising
- Copyright
- © 2026 gravass, Inc.