# PractiCalculator vs O'der stack

The clearest difference is in-app purchases: PractiCalculator at none against O'der stack's 3. PractiCalculator also leads on update cadence (monthly vs every 3 months) and iOS requirement (13.0 vs 15.6). O'der stack's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. O'der stack sells 3 one-off in-app purchases. PractiCalculator asks for nothing beyond the download.

PractiCalculator ships an update monthly, O'der stack every 3 months. The most recent releases landed on September 17, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | PractiCalculator | O'der stack |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 3 months |
| Size | 8 MB | 59 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tsutomu Nagai](https://appshunter.io/developer/1137546239) | [ICT Fractal Inc.](https://appshunter.io/developer/473613262) |

## What reviewers say

### PractiCalculator

[App page](https://appshunter.io/ios/app/practicalculator/id1137546240)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is PractiCalculator free?

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

### Is O'der stack free?

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

### Do PractiCalculator or O'der stack have ads?

PractiCalculator shows ads; O'der stack does not.

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

PractiCalculator ships an update monthly, and O'der stack every 3 months. Most recently, PractiCalculator was updated on September 17, 2026 and O'der stack on October 1, 2026.

---

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