# O'der stack vs CompisCalculator Pro

The clearest difference is update cadence: CompisCalculator Pro at every 3 weeks against O'der stack's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. O'der stack sells 3 one-off in-app purchases and CompisCalculator Pro sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

O'der stack ships an update every 3 months, CompisCalculator Pro every 3 weeks. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | O'der stack | CompisCalculator Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/compiscalculator-pro/id6451198443/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 59 MB | 3 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ICT Fractal Inc.](https://appshunter.io/developer/473613262) | [Karl Noreland](https://appshunter.io/developer/1697120498) |

## What reviewers say

### O'der stack

[App page](https://appshunter.io/ios/app/oder-stack/id1449798272)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Free trial for 7 days. | Free | one-time |
| Activate for 1 month. | $0.99 | one-time |
| Activate for year. | $9.99 | one-time |


### CompisCalculator Pro

[App page](https://appshunter.io/ios/app/compiscalculator-pro/id6451198443)

A scientific calculator designed to enhance productivity with features like real-time results, unit conversion, and custom buttons. It offers a date calculator, customizable appearance, and is optimized for iPad.

**Highlights:** Real-time calculation results, Integrated unit and currency converter, Customizable buttons and functions, Date and time difference calculator, Calculation history, Customizable appearance, iPad optimization

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CompisCalculator premium | $2.49 | one-time |


## Frequently asked questions

### Is O'der stack free?

O'der stack is free to download, with in-app purchases available.

### Is CompisCalculator Pro free?

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

### Do O'der stack or CompisCalculator Pro have ads?

Neither O'der stack nor CompisCalculator Pro shows ads.

### Which is updated more often, O'der stack or CompisCalculator Pro?

O'der stack ships an update every 3 months, and CompisCalculator Pro every 3 weeks. Most recently, O'der stack was updated on October 25, 2026 and CompisCalculator Pro on October 30, 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.*