# Customizable calculator vs ProCalc

The clearest difference is in-app purchases: Customizable calculator at none against ProCalc's 4. Customizable calculator also leads on update cadence (every 2 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ProCalc sells 4 one-off in-app purchases. Customizable calculator asks for nothing beyond the download.

Customizable calculator ships an update every 2 days, ProCalc monthly. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Customizable calculator | ProCalc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Monthly |
| Size | 202 MB | 34 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hisashi Yoshizawa](https://appshunter.io/developer/1770019728) | [Penquinzoo Limited](https://appshunter.io/developer/1551454365) |

## What reviewers say

### Customizable calculator

[App page](https://appshunter.io/ios/app/customizable-calculator/id6740001661)

**In-app purchases:** none


### 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 Customizable calculator free?

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

### Is ProCalc free?

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

### Do Customizable calculator or ProCalc have ads?

Both Customizable calculator and ProCalc show ads.

### Which is updated more often, Customizable calculator or ProCalc?

Customizable calculator ships an update every 2 days, and ProCalc monthly. Most recently, Customizable calculator was updated on October 25, 2026 and ProCalc on October 28, 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.*