# ConvertX vs Calc Engine

The clearest difference is update cadence: Calc Engine at daily against ConvertX's every 9 months. Calc Engine also leads on ratings volume (4 vs 1) and device support (4 vs 2). ConvertX's advantage is iOS requirement (11.0 vs 18). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. ConvertX sells 3 one-off in-app purchases and Calc Engine sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for ConvertX against 5.0 for Calc Engine. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

ConvertX ships an update every 9 months, Calc Engine daily. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ConvertX | Calc Engine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/convertx-currency-converter/id424562537/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/calc-engine/id1061766849/reviews) |
| Number of ratings | 1 | **4** |
| Positive reviews | 70.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Daily** |
| Monetization | Free | Free |
| Size | 19 MB | 17 MB |
| Requires iOS | **11.0** | 18 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Mallow Technologies Private Limited](https://appshunter.io/developer/416807590) | [VersaEdge Software, LLC](https://appshunter.io/developer/301294952) |

## What reviewers say

### ConvertX

[App page](https://appshunter.io/ios/app/convertx-currency-converter/id424562537)

This utility app offers comprehensive unit and currency conversion, featuring a vast library of 782 units across 56 categories. It includes popular and rare units, a powerful search function, and a favorites list for quick access. Real-time currency exchange rates are also provided.

**Highlights:** 782 units in 56 categories, Popular and rare unit support, Powerful search functionality, Favorites for quick access, Real-time currency exchange rates, In-built calculator, Customizable themes

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Good | Free | one-time |
| Excellent! | Free | one-time |
| Wow!! | Free | one-time |


### 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 |


## Frequently asked questions

### Is ConvertX free?

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

### Is Calc Engine free?

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

### Which has better reviews, ConvertX or Calc Engine?

ConvertX and Calc Engine are both rated 5.0 out of 5 on the App Store, from 1 and 4 ratings respectively.

### Do ConvertX or Calc Engine have ads?

Neither ConvertX nor Calc Engine shows ads.

### Which is updated more often, ConvertX or Calc Engine?

ConvertX ships an update every 9 months, and Calc Engine daily. Most recently, ConvertX was updated on October 23, 2026 and Calc Engine on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*