# Timer Machine vs Acid Interval

The clearest difference is rating: Acid Interval at 5.0 against Timer Machine's 3.8. Timer Machine's advantage is in-app purchases (none vs 1) and ratings volume (20 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. Timer Machine asks for nothing beyond the download.

Acid Interval holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: Timer Machine has 20 ratings behind it against 1, so its average is the more settled of the two.

## The numbers

| Metric | Timer Machine | Acid Interval |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (20 ratings)](https://appshunter.io/ios/app/timer-machine/id1387301617/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/acid-interval-focus-timer/id6815378728/reviews)** |
| Number of ratings | **20** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | — |
| Monetization | **Free** | Freemium |
| Size | 14 MB | 1 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Montage App, Inc.](https://appshunter.io/developer/1530864548) | [Preston Carr](https://appshunter.io/developer/6815378730) |

## What reviewers say

### Timer Machine

[App page](https://appshunter.io/ios/app/timer-machine/id1387301617)

Manage your time effectively with three customizable timers. Set personalized alert sounds to suit your workflow for work, study, or personal projects. This app offers an intuitive interface for a more organized approach to your day.

**Highlights:** Three personalized timers, Customizable alert sounds, User-friendly interface, Time management for work and study, Intuitive design

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**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 Timer Machine free?

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

### Is Acid Interval free?

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

### Which has better reviews, Timer Machine or Acid Interval?

Acid Interval is rated higher. Timer Machine averages 3.8 out of 5 from 20 ratings, while Acid Interval averages 5.0 from 1 ratings.

### Do Timer Machine or Acid Interval have ads?

Neither Timer Machine nor Acid Interval shows ads.

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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.*