# Timer & Stopwatch vs Acid Interval

The clearest difference is update cadence: Timer & Stopwatch at weekly against Acid Interval's every 2 weeks. Acid Interval's advantage is iOS requirement (17.0 vs 26.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Timer & Stopwatch sells 3 in-app purchases, starting at $0.99 per 7 days and Acid Interval sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Timer & Stopwatch ships an update weekly, Acid Interval every 2 weeks. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Timer & Stopwatch | Acid Interval |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/acid-interval-focus-timer/id6815378728/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | — | Freemium |
| Size | 15 MB | 1 MB |
| Requires iOS | 26.2 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [JORG VAN HETTINGA](https://appshunter.io/developer/1842828533) | [Preston Carr](https://appshunter.io/developer/6815378730) |

## What reviewers say

### Timer & Stopwatch

[App page](https://appshunter.io/ios/app/timer-and-stopwatch-countdo/id6757424172)

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $0.99 | per 7 days |
| Monthly | $1.99 | per month |
| Annual | $6.99 | per year |


### Acid Interval

[App page](https://appshunter.io/ios/app/acid-interval-focus-timer/id6815378728)

This focus timer offers a visually unique approach to deep work, moving away from traditional interfaces. It provides customizable timers and engaging visual feedback to help users stay on task, even with the screen off. The app prioritizes a distraction-free experience with no account or data syncing required.

**Highlights:** Unique visual interface, Customizable timer intervals, Engaging animation mechanisms, Screen-off notifications, No account or data sync, Phone lock compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Acid Interval Pro | $2.99 | one-time |


## Frequently asked questions

### Is Timer & Stopwatch free?

Timer & Stopwatch is free to download, with in-app purchases available.

### Is Acid Interval free?

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

### Do Timer & Stopwatch or Acid Interval have ads?

Neither Timer & Stopwatch nor Acid Interval shows ads.

### Which is updated more often, Timer & Stopwatch or Acid Interval?

Timer & Stopwatch ships an update weekly, and Acid Interval every 2 weeks. Most recently, Timer & Stopwatch was updated on October 24, 2026 and Acid Interval on October 22, 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.*