# Prime Rush vs Rondo

The clearest difference is ads: Rondo at none against Prime Rush's shown. Rondo also leads on update cadence (every 4 days vs every 3 weeks) and device support (3 vs 1). Prime Rush's advantage is iOS requirement (17 vs 26.0). On price and in-app purchases there is nothing between them.

Both are free to download. Prime Rush sells 1 one-off in-app purchase and Rondo sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Prime Rush ships an update every 3 weeks, Rondo every 4 days. The most recent releases landed on September 10, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Prime Rush | Rondo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rondo-prime-factorization/id6784029039/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 21 MB | 8 MB |
| Requires iOS | **17** | 26.0 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Ayumu Izumi](https://appshunter.io/developer/1822273057) | [KEN TOMINAGA](https://appshunter.io/developer/975026926) |

## What reviewers say

### Prime Rush

[App page](https://appshunter.io/ios/app/prime-rush-math-time-attack/id6755986782)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Plan | $1.99 | one-time |


### 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 Prime Rush free?

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

### Is Rondo free?

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

### Do Prime Rush or Rondo have ads?

Prime Rush shows ads; Rondo does not.

### Which is updated more often, Prime Rush or Rondo?

Prime Rush ships an update every 3 weeks, and Rondo every 4 days. Most recently, Prime Rush was updated on September 10, 2026 and Rondo on September 12, 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.*