# 82億分の1 vs Prime Nerd

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.

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.

## The numbers

| Metric | 82億分の1 | Prime Nerd |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 3 days** |
| Monetization | **Free** | Ad-supported |
| Size | 65 MB | 50 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ikumi NAKAMURA](https://appshunter.io/developer/1632866319) | [Hiroki Sekimoto](https://appshunter.io/developer/1877884860) |

## What reviewers say

### 82億分の1

[App page](https://appshunter.io/ios/app/821/id6445803814)

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.

**Highlights:** Set tap probability, Score based on hits, Global score competition, Aim for world's best, Rapid tap mode, World record attempts

**Features:** Vision Pro support

**In-app purchases:** none


### Prime Nerd

[App page](https://appshunter.io/ios/app/prime-nerd/id6760544446)

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.

**Highlights:** Identify prime numbers, Timed challenges, Global leaderboard, Multiple difficulty levels, Combo score multiplier, Training mode, Dark/Light theme

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 82億分の1 free?

82億分の1 is free to download, with no in-app purchases.

### Is Prime Nerd free?

Prime Nerd is free to download, with no in-app purchases.

### Do 82億分の1 or Prime Nerd have ads?

Prime Nerd shows ads; 82億分の1 does not.

### Which is updated more often, 82億分の1 or Prime Nerd?

82億分の1 ships an update every 5 months, and Prime Nerd every 3 days. Most recently, 82億分の1 was updated on October 15, 2026 and Prime Nerd on October 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*