# Auto Timer vs Acid Interval

The clearest difference is in-app purchases: Auto Timer at none against Acid Interval's 1. Auto Timer also leads on device support (3 vs 1) and iOS requirement (12.0 vs 17.0). On price, update cadence and ads there is nothing between them.

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

Auto Timer ships an update fortnightly, Acid Interval every 2 weeks. The most recent releases landed on October 16, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Auto Timer | 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 | **Fortnightly** | Every 2 weeks |
| Monetization | — | Freemium |
| Size | 64 MB | 1 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Osman Okkes Kanadikirik](https://appshunter.io/developer/1593403662) | [Preston Carr](https://appshunter.io/developer/6815378730) |

## What reviewers say

### Auto Timer

[App page](https://appshunter.io/ios/app/auto-timer-the-easiest-one/id1599943005)

**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 Auto Timer free?

Auto Timer 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 Auto Timer or Acid Interval have ads?

Neither Auto Timer nor Acid Interval shows ads.

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

Auto Timer ships an update fortnightly, and Acid Interval every 2 weeks. Most recently, Auto Timer was updated on October 16, 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.*