# Octal vs Polynomial Regression

The clearest difference is in-app purchases: Polynomial Regression at none against Octal's 1. Polynomial Regression also leads on ads (none vs shown) and update cadence (every 3 weeks vs every 5 months). Octal's advantage is iOS requirement (13.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. Octal sells 1 one-off in-app purchase. Polynomial Regression asks for nothing beyond the download.

Octal ships an update every 5 months, Polynomial Regression every 3 weeks. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Octal | Polynomial Regression |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Size | 139 MB | 4 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Amrit Duwal](https://appshunter.io/developer/1507795021) | [Yuri Morozov](https://appshunter.io/developer/1582368813) |

## What reviewers say

### Octal

[App page](https://appshunter.io/ios/app/octal/id1597563932)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| No Ads | $0.99 | one-time |


### Polynomial Regression

[App page](https://appshunter.io/ios/app/polynomial-regression/id6741364702)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Octal free?

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

### Is Polynomial Regression free?

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

### Do Octal or Polynomial Regression have ads?

Octal shows ads; Polynomial Regression does not.

### Which is updated more often, Octal or Polynomial Regression?

Octal ships an update every 5 months, and Polynomial Regression every 3 weeks. Most recently, Octal was updated on October 27, 2026 and Polynomial Regression on October 25, 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.*