# Pin It vs Linear Algebra

The clearest difference is update cadence: Pin It at every 2 days against Linear Algebra's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Pin It sells 1 one-off in-app purchase and Linear Algebra sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Pin It ships an update every 2 days, Linear Algebra monthly. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Pin It | Linear Algebra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (19 ratings)](https://appshunter.io/ios/app/pin-it-pin-island/id6753946385/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 81.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 24 MB | 73 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [ZIZICICI LIMITED](https://appshunter.io/developer/1564555697) | [光浩 李](https://appshunter.io/developer/1576352133) |

## What reviewers say

### Pin It

[App page](https://appshunter.io/ios/app/pin-it-pin-island/id6753946385)

This app transforms your iPhone's Dynamic Island into a persistent display for important text or images. Keep order numbers, codes, and quick notes visible on your Lock Screen and above all other apps for instant access. Seamlessly integrate with Siri Shortcuts for faster logging and automation.

**Highlights:** Pin text or images to Dynamic Island, Persistent display on Lock Screen and above apps, Siri Shortcuts integration, One-tap pinning and automation, Long-press to manage pinned items, Clean and intuitive interface

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pin Pro | $3.99 | one-time |


### Linear Algebra

[App page](https://appshunter.io/ios/app/linear-algebra-matrix-solver/id6766080565)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $2.99 | one-time |


## Frequently asked questions

### Is Pin It free?

Pin It 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 Pin It or Linear Algebra have ads?

Neither Pin It nor Linear Algebra shows ads.

### Which is updated more often, Pin It or Linear Algebra?

Pin It ships an update every 2 days, and Linear Algebra monthly. Most recently, Pin It was updated on November 5, 2026 and Linear Algebra on October 31, 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.*