はい！アウト！ vs 1/2 one
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
はい！アウト！
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このゲームの中では年齢・性別・能力は全て関係なし！ セーフが出れば成功・アウトが出れば失敗の単純明快なゲームなっています。 みんなで集まれば「はい！アウト！」 自分の第6感を頼りに正解への道を切り開け！ 【ルール】 ルールは簡単！ボタンを押して離すだけ！ 演出によりセーフへの期待値が変わっていきます。 各種設定変更が可能となっています。 確率は1/2・1/3・1/5に変更することができ、演出のカットや BGM・効果音のカットも可能となりますので状況に合わせ設定してください。 また、自分の運試しとしてセーフの連チャン記録も用意していますので何連 チャンでセーフを出すことができるのか試してみてください！
1/2 one
Test your luck and strategy in this simple guessing game. Aim for consecutive correct answers with a 50/50 chance, and track your progress. You get one chance to redo a selection per streak.
- 50/50 guessing mechanic
- Consecutive correct answer tracking
- Single redo per streak
- Probability display
- Simple L/R choices
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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/
Screenshots
Verdict
The clearest difference is ads: はい！アウト！ at none against 1/2 one's shown. はい！アウト！ also leads on update cadence (weekly vs every 2 months) and iOS requirement (11.0 vs 16.4). On price, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
はい！アウト！ ships an update weekly, 1/2 one every 2 months. Both last shipped on October 2, 2026.
| Parameter | はい！アウト！ | 1/2 one |
|---|---|---|
| Price | Free | Free |
| Positive reviews | — | 50.0% of reviews |
| Update frequency | Weekly — better | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | — | Ad-supported |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 11.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 89 MB | 49 MB |
| Age rating | 4+ | 9+ |
| Developer | calect Inc. | gravass, Inc. |
In-app purchases
はい！アウト！
No in-app purchases
1/2 one
No in-app purchases
