# O'der stack vs sci.calculator

The clearest difference is update cadence: sci.calculator at every 5 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 sci.calculator 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, sci.calculator every 5 weeks. The most recent releases landed on September 13, 2026 and December 22, 2025 respectively.

## The numbers

| Metric | O'der stack | sci.calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Size | 59 MB | 49 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) | [Yukihiro Shioya](https://appshunter.io/developer/1565306192) |

## 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 |


### sci.calculator

[App page](https://appshunter.io/ios/app/scicalculator/id1620728508)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is O'der stack free?

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

### Is sci.calculator free?

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

### Do O'der stack or sci.calculator have ads?

Neither O'der stack nor sci.calculator shows ads.

### Which is updated more often, O'der stack or sci.calculator?

O'der stack ships an update every 3 months, and sci.calculator every 5 weeks. Most recently, O'der stack was updated on September 13, 2026 and sci.calculator on December 22, 2025.

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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.*