# Moment_Stopwatch vs Acid Interval

The clearest difference is in-app purchases: Moment_Stopwatch at none against Acid Interval's 1. Moment_Stopwatch also leads on update cadence (weekly vs every 2 weeks) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. Acid Interval sells 1 one-off in-app purchase. Moment_Stopwatch asks for nothing beyond the download.

Moment_Stopwatch ships an update weekly, Acid Interval every 2 weeks. The most recent releases landed on October 15, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Moment_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 | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | — | Freemium |
| Size | 22 MB | 1 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Youngho Kim](https://appshunter.io/developer/1806541334) | [Preston Carr](https://appshunter.io/developer/6815378730) |

## What reviewers say

### Moment_Stopwatch

[App page](https://appshunter.io/ios/app/moment-stopwatch/id6744205488)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Moment_Stopwatch free?

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

### Is Acid Interval free?

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

### Do Moment_Stopwatch or Acid Interval have ads?

Neither Moment_Stopwatch nor Acid Interval shows ads.

### Which is updated more often, Moment_Stopwatch or Acid Interval?

Moment_Stopwatch ships an update weekly, and Acid Interval every 2 weeks. Most recently, Moment_Stopwatch was updated on October 15, 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.*