# Boost System vs Iron Diary

The clearest difference is update cadence: Iron Diary at every 6 days against Boost System's every 2 months. 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.

Boost System ships an update every 2 months, Iron Diary every 6 days. The most recent releases landed on June 1, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Boost System | Iron Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 days** |
| Size | 24 MB | 38 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Cerum AS](https://appshunter.io/developer/879204595) | [Even Kofoed](https://appshunter.io/developer/1896131110) |

## What reviewers say

### Boost System

[App page](https://appshunter.io/ios/app/boost-system/id1319312136)

**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 Boost System free?

Boost System 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 Boost System or Iron Diary have ads?

Neither Boost System nor Iron Diary shows ads.

### Which is updated more often, Boost System or Iron Diary?

Boost System ships an update every 2 months, and Iron Diary every 6 days. Most recently, Boost System was updated on June 1, 2026 and Iron Diary on September 17, 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.*