# Circle timer vs Mastery

The clearest difference is price: Mastery at Free against Circle timer's $0.99. Circle timer's advantage is in-app purchases (none vs 3) and update cadence (every 4 days vs every 2 weeks). On ads there is nothing between them.

Mastery is free to download; Circle timer costs $0.99 up front. Mastery sells 3 in-app purchases, starting at $2.99 per month. Circle timer asks for nothing beyond the download.

Circle timer ships an update every 4 days, Mastery every 2 weeks. The most recent releases landed on October 5, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Circle timer | Mastery |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 weeks |
| Size | 1 MB | 27 MB |
| Requires iOS | **14.4** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | +12 |
| Developer | [hideo nakamura](https://appshunter.io/developer/1242808811) | [Adam Kovacs](https://appshunter.io/developer/1814096456) |

## What reviewers say

### Circle timer

[App page](https://appshunter.io/ios/app/circle-timer-pie-chart-timer/id6686403808)

**In-app purchases:** none


### Mastery

[App page](https://appshunter.io/ios/app/mastery-habit-tracker/id6759011987)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mastery Pro Monthly | $2.99 | per month |
| Annual | $14.99 | per year |
| Mastery Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is Circle timer free?

Circle timer costs $0.99, with no in-app purchases.

### Is Mastery free?

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

### Do Circle timer or Mastery have ads?

Neither Circle timer nor Mastery shows ads.

### Which is updated more often, Circle timer or Mastery?

Circle timer ships an update every 4 days, and Mastery every 2 weeks. Most recently, Circle timer was updated on October 5, 2026 and Mastery on October 3, 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.*