# Calc Engine vs ZZZ MDEditor

The clearest difference is ads: Calc Engine at none against ZZZ MDEditor's shown. Calc Engine also leads on update cadence (daily vs every 3 weeks). ZZZ MDEditor's advantage is iOS requirement (13.0 vs 18). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Calc Engine sells 1 one-off in-app purchase and ZZZ MDEditor sells 1 in-app purchase, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Calc Engine ships an update daily, ZZZ MDEditor every 3 weeks. The most recent releases landed on October 16, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Calc Engine | ZZZ MDEditor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/calc-engine/id1061766849/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Daily** | Every 3 weeks |
| Monetization | Free | — |
| Size | 17 MB | 36 MB |
| Requires iOS | 18 | **13.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [VersaEdge Software, LLC](https://appshunter.io/developer/301294952) | [SMOLT STAGE, K.K.](https://appshunter.io/developer/1708601451) |

## What reviewers say

### Calc Engine

[App page](https://appshunter.io/ios/app/calc-engine/id1061766849)

A highly customizable calculator with advanced features like graphing, equation solving, and unit conversion. Design your own keyboards and functions to streamline your workflow across Apple devices.

**Highlights:** Customizable keyboard layouts, User-defined functions and constants, Live equation graphing, Equation solving, Extensive unit conversions, Programmer mode (hex, binary, octal), Cross-device syncing

**Features:** Family Sharing, Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calc Engine+ | $9.99 | one-time |


### 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 Calc Engine free?

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

### Is ZZZ MDEditor free?

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

### Do Calc Engine or ZZZ MDEditor have ads?

ZZZ MDEditor shows ads; Calc Engine does not.

### Which is updated more often, Calc Engine or ZZZ MDEditor?

Calc Engine ships an update daily, and ZZZ MDEditor every 3 weeks. Most recently, Calc Engine was updated on October 16, 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.*