# Coal 2 Solar vs Soul Diary

The clearest difference is ads: Coal 2 Solar at none against Soul Diary's shown. Soul Diary's advantage is update cadence (fortnightly vs monthly) and iOS requirement (13.0 vs 16.4). On price, in-app purchases and device support there is nothing between them.

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

Coal 2 Solar ships an update monthly, Soul Diary fortnightly. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Coal 2 Solar | Soul Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Fortnightly** |
| Size | 45 MB | 48 MB |
| Requires iOS | 16.4 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ureca](https://appshunter.io/developer/1658246933) | [HONG KONG GUANGSHANG TRADING CO.,LIMITED](https://appshunter.io/developer/1786118727) |

## What reviewers say

### Coal 2 Solar

[App page](https://appshunter.io/ios/app/coal-2-solar/id6736794539)

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

**In-app purchases:** none


### Soul Diary

[App page](https://appshunter.io/ios/app/soul-diary-memory-box/id6739574662)

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

**In-app purchases:** none


## Frequently asked questions

### Is Coal 2 Solar free?

Coal 2 Solar is free to download, with no in-app purchases.

### Is Soul Diary free?

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

### Do Coal 2 Solar or Soul Diary have ads?

Soul Diary shows ads; Coal 2 Solar does not.

### Which is updated more often, Coal 2 Solar or Soul Diary?

Coal 2 Solar ships an update monthly, and Soul Diary fortnightly. Most recently, Coal 2 Solar was updated on November 4, 2026 and Soul Diary on October 30, 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.*