# Circle Calculator vs Rondo

The clearest difference is ads: Rondo at none against Circle Calculator's shown. Rondo also leads on update cadence (every 3 days vs every 5 weeks). Circle Calculator's advantage is iOS requirement (13.0 vs 26.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Circle Calculator sells 7 in-app purchases, starting at $1.99 per 7 days and Rondo sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Circle Calculator ships an update every 5 weeks, Rondo every 3 days. The most recent releases landed on November 9, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Circle Calculator | 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 5 weeks | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 72 MB | 11 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [AHMET DEMIR](https://appshunter.io/developer/1849165331) | [KEN TOMINAGA](https://appshunter.io/developer/975026926) |

## What reviewers say

### Circle Calculator

[App page](https://appshunter.io/ios/app/circle-calculator-geometry/id6760240001)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Circle Pro Weekly | $1.99 | per 7 days |
| Circle Pro Weekly | $3.99 | per 7 days |
| Circle Pro Monthly | $3.99 | per month |
| Circle Pro Monthly | $7.99 | per month |
| Circle Pro Annual | $24.99 | per year |
| Circle Pro Annual | $49.99 | per year |
| Circle Calculator Pro Lifetime | $49.99 | 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 Circle Calculator free?

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

### Is Rondo free?

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

### Do Circle Calculator or Rondo have ads?

Circle Calculator shows ads; Rondo does not.

### Which is updated more often, Circle Calculator or Rondo?

Circle Calculator ships an update every 5 weeks, and Rondo every 3 days. Most recently, Circle Calculator was updated on November 9, 2026 and Rondo on November 5, 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.*