# FixM4A vs Redo Calculator

The clearest difference is in-app purchases: Redo Calculator at none against FixM4A's 1. Redo Calculator also leads on iOS requirement (13.0 vs 15.0). FixM4A's advantage is update cadence (every 4 days vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. FixM4A sells 1 one-off in-app purchase. Redo Calculator asks for nothing beyond the download.

FixM4A ships an update every 4 days, Redo Calculator every 2 months. The most recent releases landed on October 19, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | FixM4A | Redo Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 11 MB | 20 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Newkline Co., Ltd.](https://appshunter.io/developer/581922117) | [Seongmin Yim](https://appshunter.io/developer/1529542974) |

## What reviewers say

### FixM4A

[App page](https://appshunter.io/ios/app/fixm4a/id6743666599)

This utility tool aims to recover unplayable M4A audio files corrupted by truncation or damage. It extracts and converts available data from damaged files to restore them. Users select the corrupted file and a similar good file to initiate the repair process.

**Highlights:** Repair truncated M4A files, Recover corrupted audio, Extract data from damaged files, Convert restored audio, User-friendly repair process

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fix M4A | $3.99 | one-time |


### Redo Calculator

[App page](https://appshunter.io/ios/app/redo-calculator/id6753993375)

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

**In-app purchases:** none


## Frequently asked questions

### Is FixM4A free?

FixM4A is free to download, with in-app purchases available.

### Is Redo Calculator free?

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

### Do FixM4A or Redo Calculator have ads?

Neither FixM4A nor Redo Calculator shows ads.

### Which is updated more often, FixM4A or Redo Calculator?

FixM4A ships an update every 4 days, and Redo Calculator every 2 months. Most recently, FixM4A was updated on October 19, 2026 and Redo Calculator on October 7, 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.*