# Calc Engine vs ProCalc

The clearest difference is ads: Calc Engine at none against ProCalc's shown. Calc Engine also leads on update cadence (daily vs monthly). ProCalc'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 ProCalc sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Calc Engine ships an update daily, ProCalc monthly. The most recent releases landed on October 16, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Calc Engine | ProCalc |
| --- | --- | --- |
| 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** | Monthly |
| Monetization | Free | — |
| Size | 17 MB | 34 MB |
| Requires iOS | 18 | **13.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [VersaEdge Software, LLC](https://appshunter.io/developer/301294952) | [Penquinzoo Limited](https://appshunter.io/developer/1551454365) |

## 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 |


### ProCalc

[App page](https://appshunter.io/ios/app/procalc-calculator-app/id6756341509)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Flat themes | $3.99 | one-time |
| Graphs and pdf export. | $3.99 | one-time |
| Unlock Neon themes | $4.99 | one-time |
| All  themes | $4.99 | one-time |


## Frequently asked questions

### Is Calc Engine free?

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

### Is ProCalc free?

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

### Do Calc Engine or ProCalc have ads?

ProCalc shows ads; Calc Engine does not.

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

Calc Engine ships an update daily, and ProCalc monthly. Most recently, Calc Engine was updated on October 16, 2026 and ProCalc on October 19, 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.*