# Calibre Firmware Updater vs Runflake

The clearest difference is update cadence: Runflake at every 3 days against Calibre Firmware Updater's every 4 weeks. Calibre Firmware Updater's advantage is iOS requirement (12.0 vs 16.4). 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.

Calibre Firmware Updater ships an update every 4 weeks, Runflake every 3 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Calibre Firmware Updater | Runflake |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 3 days** |
| Size | 12 MB | 72 MB |
| Requires iOS | **12.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [BreathTaking Tech LLC](https://appshunter.io/developer/1609706657) | [WorkNPLAY Inc.](https://appshunter.io/developer/6810142839) |

## What reviewers say

### Calibre Firmware Updater

[App page](https://appshunter.io/ios/app/calibre-firmware-updater/id6744065384)

**In-app purchases:** none


### Runflake

[App page](https://appshunter.io/ios/app/runflake-run-tracker/id6796767414)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Calibre Firmware Updater free?

Calibre Firmware Updater is free to download, with no in-app purchases.

### Is Runflake free?

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

### Do Calibre Firmware Updater or Runflake have ads?

Neither Calibre Firmware Updater nor Runflake shows ads.

### Which is updated more often, Calibre Firmware Updater or Runflake?

Calibre Firmware Updater ships an update every 4 weeks, and Runflake every 3 days. Most recently, Calibre Firmware Updater was updated on October 25, 2026 and Runflake on October 24, 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.*