# M923. vs Soundiary

The clearest difference is price: M923. at Free against Soundiary's $0.99. M923. also leads on iOS requirement (11.0 vs 18.0). Soundiary's advantage is update cadence (every 3 days vs every 4 months). On ads, in-app purchases and device support there is nothing between them.

M923. is free to download; Soundiary costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

M923. ships an update every 4 months, Soundiary every 3 days. Both last shipped on October 29, 2026.

## The numbers

| Metric | M923. | Soundiary |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 days** |
| Monetization | — | Paid |
| Size | 306 MB | 2 MB |
| Requires iOS | **11.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Total Reality B.V.](https://appshunter.io/developer/1072438941) | [磊 辛](https://appshunter.io/developer/6820685434) |

## What reviewers say

### M923.

[App page](https://appshunter.io/ios/app/m923/id1483939562)

**Features:** macOS Compatibility

**In-app purchases:** none


### Soundiary

[App page](https://appshunter.io/ios/app/soundiary/id6822114548)

This app transforms your daily sounds and body signals into a private journal entry. It analyzes ambient noise, voice, and physiological data to create a summary of your day, focusing on meaning rather than raw audio storage.

**Highlights:** Voice and sound journaling, Body signal analysis, On-device processing, Speaker identification, Optional audio saving, Voice sensitivity levels, Power-saving mode

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is M923. free?

M923. is free to download, with no in-app purchases.

### Is Soundiary free?

Soundiary costs $0.99, with no in-app purchases.

### Do M923. or Soundiary have ads?

Neither M923. nor Soundiary shows ads.

### Which is updated more often, M923. or Soundiary?

M923. ships an update every 4 months, and Soundiary every 3 days. Most recently, M923. was updated on October 29, 2026 and Soundiary on October 29, 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.*