# Extreme Addition vs Rondo

The clearest difference is in-app purchases: Extreme Addition at none against Rondo's 5. Extreme Addition also leads on device support (6 vs 3) and iOS requirement (15.6 vs 26.0). Rondo's advantage is update cadence (every 4 days vs every 3 weeks). On price and ads there is nothing between them.

Both are free to download. Rondo sells 5 one-off in-app purchases. Extreme Addition asks for nothing beyond the download.

Extreme Addition ships an update every 3 weeks, Rondo every 4 days. The most recent releases landed on October 20, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Extreme Addition | Rondo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rondo-prime-factorization/id6784029039/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 65 MB | 8 MB |
| Requires iOS | **15.6** | 26.0 |
| Devices | **iPhone, iPad, iPod, Mac, Apple TV, Apple Watch** | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [BARTOLI JOHAN](https://appshunter.io/developer/1317257810) | [KEN TOMINAGA](https://appshunter.io/developer/975026926) |

## What reviewers say

### Extreme Addition

[App page](https://appshunter.io/ios/app/extreme-addition/id1490095010)

This game offers a unique approach to addition, challenging players to boost their mental calculation skills. It features three levels with increasing number complexity and timed rounds to improve speed and reasoning. The game aims to build confidence and concentration through engaging number practice.

**Highlights:** Unique addition mechanics, Boosts mental calculation, Improves speed and reasoning, Three difficulty levels, Timed rounds for score saving, Enhances concentration and confidence

**In-app purchases:** none


### Rondo

[App page](https://appshunter.io/ios/app/rondo-prime-factorization/id6784029039)

Explore the mathematical beauty of numbers through interactive, animated factorization diagrams. Watch numbers dance, hear their unique songs, and even visualize them in augmented reality. Discover the stories behind special numbers and personalize your experience with customizable palettes and sounds.

**Highlights:** Animated factorization diagrams, Augmented reality number visualization, Auditory representation of factors, Interactive number exploration, Field Guide for special numbers, Home screen and Apple Watch widgets, Customizable color palettes and sounds

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tip a prime · 199 | $1.99 | one-time |
| Tip a prime · 499 | $4.99 | one-time |
| Rondo Pro | $4.99 | one-time |
| Tip a prime · 599 | $5.99 | one-time |
| Tip a prime · 1999 | $19.99 | one-time |


## Frequently asked questions

### Is Extreme Addition free?

Extreme Addition is free to download, with no in-app purchases.

### Is Rondo free?

Rondo is free to download, with in-app purchases available.

### Do Extreme Addition or Rondo have ads?

Neither Extreme Addition nor Rondo shows ads.

### Which is updated more often, Extreme Addition or Rondo?

Extreme Addition ships an update every 3 weeks, and Rondo every 4 days. Most recently, Extreme Addition was updated on October 20, 2026 and Rondo on October 16, 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.*