# HalfCaff vs Caffeine mg

HalfCaff and Caffeine mg are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. HalfCaff sells 3 in-app purchases, starting at $1.99 per 7 days and Caffeine mg sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

HalfCaff ships an update every 6 days, Caffeine mg weekly. The most recent releases landed on July 4, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | HalfCaff | Caffeine mg |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Weekly |
| Size | 4 MB | 5 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Yutaro Koide](https://appshunter.io/developer/1880033436) | [kensuke ueda](https://appshunter.io/developer/961845390) |

## What reviewers say

### HalfCaff

[App page](https://appshunter.io/ios/app/halfcaff/id6760937590)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Monthly | $5.99 | per month |
| Yearly | $22.99 | per year |


### 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 |


## Frequently asked questions

### Is HalfCaff free?

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

### Is Caffeine mg free?

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

### Do HalfCaff or Caffeine mg have ads?

Neither HalfCaff nor Caffeine mg shows ads.

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

HalfCaff ships an update every 6 days, and Caffeine mg weekly. Most recently, HalfCaff was updated on July 4, 2026 and Caffeine mg on September 20, 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.*