# Study Countdown vs Rondo

The clearest difference is in-app purchases: Study Countdown at none against Rondo's 5. Study Countdown also leads on iOS requirement (18.0 vs 26.0). Rondo's advantage is ads (none vs shown) and device support (3 vs 1). On price and update cadence there is nothing between them.

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

Study Countdown ships an update every 8 days, Rondo every 4 days. The most recent releases landed on September 27, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Study Countdown | 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 | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 8 days | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 14 MB | 8 MB |
| Requires iOS | **18.0** | 26.0 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 12+ | 4+ |
| Developer | [kaisei watanabe](https://appshunter.io/developer/1543587757) | [KEN TOMINAGA](https://appshunter.io/developer/975026926) |

## What reviewers say

### Study Countdown

[App page](https://appshunter.io/ios/app/study-countdown-focus-log/id6765840155)

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

**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 Study Countdown free?

Study Countdown is free to download, with no in-app purchases.

### Is Rondo free?

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

### Do Study Countdown or Rondo have ads?

Study Countdown shows ads; Rondo does not.

### Which is updated more often, Study Countdown or Rondo?

Study Countdown ships an update every 8 days, and Rondo every 4 days. Most recently, Study Countdown was updated on September 27, 2026 and Rondo on October 1, 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.*