# SiO Athletica vs Iron Diary

The clearest difference is update cadence: Iron Diary at every 6 days against SiO Athletica's every 2 weeks. Iron Diary also leads on iOS requirement (15.1 vs 17.0). On price, ads, 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.

SiO Athletica ships an update every 2 weeks, Iron Diary every 6 days. The most recent releases landed on November 3, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | SiO Athletica | Iron Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 6 days** |
| Size | 78 MB | 38 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Studentsamskipnaden i Oslo og Akershus](https://appshunter.io/developer/966671189) | [Even Kofoed](https://appshunter.io/developer/1896131110) |

## What reviewers say

### SiO Athletica

[App page](https://appshunter.io/ios/app/sio-athletica/id6457417349)

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

**In-app purchases:** none


### Iron Diary

[App page](https://appshunter.io/ios/app/iron-diary-workout-tracker/id6765935337)

**In-app purchases:** none


## Frequently asked questions

### Is SiO Athletica free?

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

### Is Iron Diary free?

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

### Do SiO Athletica or Iron Diary have ads?

Neither SiO Athletica nor Iron Diary shows ads.

### Which is updated more often, SiO Athletica or Iron Diary?

SiO Athletica ships an update every 2 weeks, and Iron Diary every 6 days. Most recently, SiO Athletica was updated on November 3, 2026 and Iron Diary on October 25, 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.*