# Caffeine mg vs Caffeine Clock

The clearest difference is update cadence: Caffeine Clock at every 2 days against Caffeine mg's weekly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Caffeine mg sells 1 one-off in-app purchase and Caffeine Clock sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Caffeine mg ships an update weekly, Caffeine Clock every 2 days. The most recent releases landed on September 20, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Caffeine mg | Caffeine Clock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 2 days** |
| Size | 5 MB | 6 MB |
| Requires iOS | 18.0 | 18.0 |
| Devices | iPhone | **iPhone, Apple Watch** |
| Age rating | 4+ | 12+ |
| Developer | [kensuke ueda](https://appshunter.io/developer/961845390) | [kazunari aoki](https://appshunter.io/developer/6774180811) |

## What reviewers say

### Caffeine mg

[App page](https://appshunter.io/ios/app/caffeine-mg-half-life-tracker/id6763047063)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| カフェインmg Pro | $1.99 | one-time |


### Caffeine Clock

[App page](https://appshunter.io/ios/app/caffeine-clock-bedtime/id6796871272)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Caffeine Clock Pro | $9.99 | one-time |


## Frequently asked questions

### Is Caffeine mg free?

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

### Is Caffeine Clock free?

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

### Do Caffeine mg or Caffeine Clock have ads?

Neither Caffeine mg nor Caffeine Clock shows ads.

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

Caffeine mg ships an update weekly, and Caffeine Clock every 2 days. Most recently, Caffeine mg was updated on September 20, 2026 and Caffeine Clock on September 8, 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.*