# Days' vs MuudWave

The clearest difference is iOS requirement: Days' at 14.0 against MuudWave's 17.5. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Days' ships an update every 4 days, MuudWave every 2 days. The most recent releases landed on June 4, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Days' | MuudWave |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 days | **Every 2 days** |
| Monetization | — | Free |
| Size | 17 MB | 3 MB |
| Requires iOS | **14.0** | 17.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Daiki Hirao](https://appshunter.io/developer/1480092196) | [Masao Narumi](https://appshunter.io/developer/1759494772) |

## What reviewers say

### Days'

[App page](https://appshunter.io/ios/app/days/id1581602165)

**Features:** macOS Compatibility

**In-app purchases:** none


### MuudWave

[App page](https://appshunter.io/ios/app/muudwave/id6740519998)

This app helps you understand your emotional patterns by tracking daily mood changes and visualizing their progression. It records relative mood shifts compared to the previous day, addressing limitations of absolute mood scales.

**Highlights:** Daily mood logging, Relative mood tracking, Emotional progression visualization, Understanding emotional shifts, Free to use

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

**In-app purchases:** none


## Frequently asked questions

### Is Days' free?

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

### Is MuudWave free?

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

### Do Days' or MuudWave have ads?

Neither Days' nor MuudWave shows ads.

### Which is updated more often, Days' or MuudWave?

Days' ships an update every 4 days, and MuudWave every 2 days. Most recently, Days' was updated on June 4, 2026 and MuudWave on September 22, 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.*