# Simple Drinking Log vs ZEN BUBBLE

The clearest difference is in-app purchases: Simple Drinking Log at none against ZEN BUBBLE's 2. ZEN BUBBLE's advantage is update cadence (weekly vs every 5 weeks) and iOS requirement (17.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. ZEN BUBBLE sells 2 in-app purchases, starting at $7.99 per month. Simple Drinking Log asks for nothing beyond the download.

Simple Drinking Log ships an update every 5 weeks, ZEN BUBBLE weekly. The most recent releases landed on October 10, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Simple Drinking Log | ZEN BUBBLE |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Weekly** |
| Size | 6 MB | 66 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Shunsuke Takanishi](https://appshunter.io/developer/1560104129) | [Keisuke Inazawa](https://appshunter.io/developer/1896767902) |

## What reviewers say

### Simple Drinking Log

[App page](https://appshunter.io/ios/app/simple-drinking-log/id6767517232)

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

**In-app purchases:** none


### ZEN BUBBLE

[App page](https://appshunter.io/ios/app/zen-bubble-calm-breathing/id6793133843)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (Monthly) | $7.99 | per month |
| Premium (Annual) | $39.99 | per year |


## Frequently asked questions

### Is Simple Drinking Log free?

Simple Drinking Log is free to download, with no in-app purchases.

### Is ZEN BUBBLE free?

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

### Do Simple Drinking Log or ZEN BUBBLE have ads?

Neither Simple Drinking Log nor ZEN BUBBLE shows ads.

### Which is updated more often, Simple Drinking Log or ZEN BUBBLE?

Simple Drinking Log ships an update every 5 weeks, and ZEN BUBBLE weekly. Most recently, Simple Drinking Log was updated on October 10, 2026 and ZEN BUBBLE on October 19, 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.*