# Calc vs O'der stack

The clearest difference is in-app purchases: Calc at none against O'der stack's 3. Calc also leads on iOS requirement (12.0 vs 15.6). O'der stack's advantage is update cadence (every 3 months vs every 10 months). On price, ads and device support there is nothing between them.

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

Calc ships an update every 10 months, O'der stack every 3 months. The most recent releases landed on October 2, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Calc | O'der stack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/calc-50/id1193016704/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 38 MB | 59 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [David Smith](https://appshunter.io/developer/1193016703) | [ICT Fractal Inc.](https://appshunter.io/developer/473613262) |

## What reviewers say

### Calc

[App page](https://appshunter.io/ios/app/calc-50/id1193016704)

This app offers a high-precision scientific calculator with over 50 digits of accuracy. It supports advanced mathematical functions, complex arithmetic, and programmable features for derivatives, integrals, and root finding.

**Highlights:** High-precision calculations (50+ digits), Extensive mathematical functions, Programmable features, Complex arithmetic, Graphing capabilities, Derivative and integral calculation

**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 Calc free?

Calc 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 Calc or O'der stack have ads?

Neither Calc nor O'der stack shows ads.

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

Calc ships an update every 10 months, and O'der stack every 3 months. Most recently, Calc was updated on October 2, 2026 and O'der stack on October 1, 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.*