82億分の1 vs Prime Nerd
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
82億分の1
Compete globally to achieve the highest score by tapping to hit a set probability. Aim for the world's best score and test your tapping speed in a special mode. Compete for world records in 5 or 10-second bursts.
- Set tap probability
- Score based on hits
- Global score competition
- Aim for world's best
- Rapid tap mode
- World record attempts
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自分で1タップするときに当たる確率を設定します。 当たったらその数がスコアに。 スコアの大きさを全国で競って、世界一を目指すゲーム。 連打力モードも搭載。 5秒または10秒間でのタップ力で世界記録を目指そう！
Prime Nerd
Tap prime numbers as they float across the screen within a time limit. This speed math game offers multiple difficulty levels, a combo system for score multipliers, and a training mode to hone your skills. Compete globally on the leaderboard and customize your challenge with digit selection.
- Identify prime numbers
- Timed challenges
- Global leaderboard
- Multiple difficulty levels
- Combo score multiplier
- Training mode
- Dark/Light theme
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Spot the prime numbers and tap them before time runs out — a simple but surprisingly deep speed math game. HOW TO PLAY Bubbles float across the screen showing numbers. Tap only the primes! You have 30 seconds — how many can you get right? Tapping a composite number counts as a miss, so think fast. FEATURES · Global Leaderboard — Submit your score and compete with players worldwide · 4 Difficulty Levels — EASY / NORMAL / HARD, plus a secret LEGEND mode to unlock · Digit Customization — Choose 1 to 5 digits. Bigger numbers = harder = higher points · Combo System — Chain correct taps to multiply your score · Training Mode — Practice without a timer and sharpen your prime sense · Dark / Light Theme — Easy on the eyes, day or night · Japanese / English supported WHO IS IT FOR? Anyone who loves math or numbers People looking for a quick mental workout Players who want to compete on leaderboards Anyone who wants to train focus and reaction speed A prime number is any integer greater than 1 that can only be divided by 1 and itself (2, 3, 5, 7, 11,13…). They seem familiar — until the numbers get big. That's the challenge. Watch a short video ad to enjoy 1 hour of ad-free play. So, what's your score?
Screenshots
Verdict
The clearest difference is review sentiment: 82億分の1 at 100% against Prime Nerd's 0%. 82億分の1 also leads on ads (none vs shown) and monetization model (free vs ad-supported). Prime Nerd's advantage is update cadence (every 3 days vs every 5 months). 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.
82億分の1 ships an update every 5 months, Prime Nerd every 3 days. The most recent releases landed on October 15, 2026 and October 11, 2026 respectively.
| Parameter | 82億分の1 | Prime Nerd |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Update frequency | Every 5 months | Every 3 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 65 MB | 50 MB |
| Age rating | 4+ | 4+ |
| Developer | Ikumi NAKAMURA | Hiroki Sekimoto |
Customer experience
82億分の1
Prime Nerd
In-app purchases
82億分の1
No in-app purchases
Prime Nerd
No in-app purchases
