Reaction Time vs 1/2 one
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Reaction Time
Test and train your reflexes with various game modes. Compete globally in periodic rankings to become the world champion. Ideal for improving reaction speed for emergencies.
- One-shot reflex games
- Random appearance challenges
- 3 consecutive reflex tests
- Global player rankings
- Periodic ranking resets
- Reflex training for emergencies
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Challenge the limits of your reflexes! We'll measure your reflexes in one-shot games, random appearances, and 3 consecutive! Train your reflexes for emergencies! You can compete with people from all over the world in the ranking. The ranking is reset periodically, so you have as many chances as you want to become the world champion.
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 update cadence: Reaction Time at fortnightly against 1/2 one's every 2 months. Reaction Time also leads on review sentiment (68% vs 50%). On price, ads, in-app purchases and monetization model 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.
Reaction Time ships an update fortnightly, 1/2 one every 2 months. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.
| Parameter | Reaction Time | 1/2 one |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (3 ratings) — better | — |
| Positive reviews | 68.1% of reviews — better | 50.0% of reviews |
| Number of ratings | 3 — better | — |
| Update frequency | Fortnightly — better | Every 2 months |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | Ad-supported |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 60 MB | 49 MB |
| Age rating | 4+ | 9+ |
| Developer | Osawa Shunsuke | gravass, Inc. |
Customer experience
Reaction Time
1/2 one
In-app purchases
Reaction Time
No in-app purchases
1/2 one
No in-app purchases
