# BathLog+ vs Caffeine mg

The clearest difference is in-app purchases: BathLog+ at none against Caffeine mg's 1. Caffeine mg's advantage is update cadence (weekly vs every 9 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Caffeine mg sells 1 one-off in-app purchase. BathLog+ asks for nothing beyond the download.

BathLog+ ships an update every 9 months, Caffeine mg weekly. The most recent releases landed on September 9, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | BathLog+ | Caffeine mg |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Weekly** |
| Size | 17 MB | 5 MB |
| Requires iOS | 18.0 | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ai Kaneko](https://appshunter.io/developer/1631771254) | [kensuke ueda](https://appshunter.io/developer/961845390) |

## What reviewers say

### BathLog+

[App page](https://appshunter.io/ios/app/bathlog-plus/id6737230733)

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

**In-app purchases:** none


### 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 BathLog+ free?

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

### Is Caffeine mg free?

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

### Do BathLog+ or Caffeine mg have ads?

Neither BathLog+ nor Caffeine mg shows ads.

### Which is updated more often, BathLog+ or Caffeine mg?

BathLog+ ships an update every 9 months, and Caffeine mg weekly. Most recently, BathLog+ was updated on September 9, 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.*