# GetPrincipia vs Linear Algebra

The clearest difference is update cadence: Linear Algebra at every 2 days against GetPrincipia's every 2 months. GetPrincipia's advantage is iOS requirement (15.1 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. GetPrincipia sells 2 in-app purchases, starting at $6.99 per month and Linear Algebra sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

GetPrincipia ships an update every 2 months, Linear Algebra every 2 days. The most recent releases landed on September 14, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | GetPrincipia | Linear Algebra |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Size | 38 MB | 21 MB |
| Requires iOS | **15.1** | 18.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Axiom 38 LLC](https://appshunter.io/developer/1887968723) | [Mohammed Yussif](https://appshunter.io/developer/1873447146) |

## What reviewers say

### GetPrincipia

[App page](https://appshunter.io/ios/app/getprincipia/id6761139348)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $6.99 | per month |
| Annual | $44.99 | per year |


### Linear Algebra

[App page](https://appshunter.io/ios/app/linear-algebra-matrixviz/id6791628348)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MatrixViz Pro Lifetime | $44.99 | one-time |


## Frequently asked questions

### Is GetPrincipia free?

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

### Is Linear Algebra free?

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

### Do GetPrincipia or Linear Algebra have ads?

Neither GetPrincipia nor Linear Algebra shows ads.

### Which is updated more often, GetPrincipia or Linear Algebra?

GetPrincipia ships an update every 2 months, and Linear Algebra every 2 days. Most recently, GetPrincipia was updated on September 14, 2026 and Linear Algebra on September 7, 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.*