# RedoCalc vs ZZZ MDEditor

The clearest difference is in-app purchases: RedoCalc at none against ZZZ MDEditor's 1. RedoCalc also leads on update cadence (every 3 days vs every 3 weeks). ZZZ MDEditor's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 18.0). On price and ads there is nothing between them.

Both are free to download. ZZZ MDEditor sells 1 in-app purchase, starting at $0.99 per month. RedoCalc asks for nothing beyond the download.

RedoCalc ships an update every 3 days, ZZZ MDEditor every 3 weeks. The most recent releases landed on October 11, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | RedoCalc | ZZZ MDEditor |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Every 3 weeks |
| Size | 3 MB | 36 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Toshiyuki Kuwabara](https://appshunter.io/developer/1649322074) | [SMOLT STAGE, K.K.](https://appshunter.io/developer/1708601451) |

## What reviewers say

### RedoCalc

[App page](https://appshunter.io/ios/app/redocalc/id6743318834)

**Features:** macOS Compatibility

**In-app purchases:** none


### ZZZ MDEditor

[App page](https://appshunter.io/ios/app/zzz-mdeditor/id6794988899)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ZZZ MDEditor Premium | $0.99 | per month |


## Frequently asked questions

### Is RedoCalc free?

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

### Is ZZZ MDEditor free?

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

### Do RedoCalc or ZZZ MDEditor have ads?

Both RedoCalc and ZZZ MDEditor show ads.

### Which is updated more often, RedoCalc or ZZZ MDEditor?

RedoCalc ships an update every 3 days, and ZZZ MDEditor every 3 weeks. Most recently, RedoCalc was updated on October 11, 2026 and ZZZ MDEditor on October 9, 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.*