# Caffeine Clock vs Faast

The clearest difference is in-app purchases: Faast at none against Caffeine Clock's 2. Faast also leads on update cadence (every 2 days vs weekly). Caffeine Clock's advantage is iOS requirement (16.4 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Caffeine Clock sells 2 one-off in-app purchases. Faast asks for nothing beyond the download.

Caffeine Clock ships an update weekly, Faast every 2 days. The most recent releases landed on October 3, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Caffeine Clock | Faast |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (27 ratings)](https://appshunter.io/ios/app/caffeine-clock-track-caffeine/id6504160396/reviews)** | — |
| Number of ratings | **27** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | **Every 2 days** |
| Monetization | Free | — |
| Size | 119 MB | 5 MB |
| Requires iOS | **16.4** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [ANTONIN WINGENDER](https://appshunter.io/developer/1751178342) | [Loan RIVIERE](https://appshunter.io/developer/1843899230) |

## What reviewers say

### Caffeine Clock

[App page](https://appshunter.io/ios/app/caffeine-clock-track-caffeine/id6504160396)

This app helps you track your caffeine intake and understand its impact on your sleep. It models caffeine absorption and half-life to provide a clear view of your current and projected levels, allowing you to plan your consumption for better rest.

**Highlights:** Caffeine absorption and half-life modeling, Real-time caffeine level tracking, Interactive home screen widgets, Sleep-aware insights and bedtime planning, Extensive drink database with custom options, Daily caffeine threshold alerts

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $4.99 | one-time |
| Remove Ads | $9.99 | one-time |


### Faast

[App page](https://appshunter.io/ios/app/faast-fasting-timer/id6787727897)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Caffeine Clock free?

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

### Is Faast free?

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

### Do Caffeine Clock or Faast have ads?

Neither Caffeine Clock nor Faast shows ads.

### Which is updated more often, Caffeine Clock or Faast?

Caffeine Clock ships an update weekly, and Faast every 2 days. Most recently, Caffeine Clock was updated on October 3, 2026 and Faast on October 11, 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.*