# PML Engineer Exam Prep vs Linear Algebra World

The clearest difference is update cadence: Linear Algebra World at every 5 days against PML Engineer Exam Prep's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PML Engineer Exam Prep ships an update every 3 months, Linear Algebra World every 5 days. The most recent releases landed on September 28, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | PML Engineer Exam Prep | Linear Algebra World |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/linear-algebra-world/id6759180671/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Monetization | — | Free |
| Size | 27 MB | 10 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Davy Raitt](https://appshunter.io/developer/1795318281) | [Eteri Byazrova](https://appshunter.io/developer/1579097115) |

## What reviewers say

### PML Engineer Exam Prep

[App page](https://appshunter.io/ios/app/pml-engineer-exam-prep/id6757166329)

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

**In-app purchases:** none


### Linear Algebra World

[App page](https://appshunter.io/ios/app/linear-algebra-world/id6759180671)

This app offers a rigorous yet accessible approach to linear algebra, combining a matrix calculator, interactive algorithm visualizer, and a structured learning path. It aims to build intuition through visual tools and a coherent system based on axioms, suitable for students and instructors.

**Highlights:** Matrix calculator, Interactive algorithm visualizer, Structured learning pathway, Visual tools for abstract topics, LaTeX import and export, Coherent system based on axioms

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PML Engineer Exam Prep free?

PML Engineer Exam Prep is free to download, with no in-app purchases.

### Is Linear Algebra World free?

Linear Algebra World is free to download, with no in-app purchases.

### Do PML Engineer Exam Prep or Linear Algebra World have ads?

Neither PML Engineer Exam Prep nor Linear Algebra World shows ads.

### Which is updated more often, PML Engineer Exam Prep or Linear Algebra World?

PML Engineer Exam Prep ships an update every 3 months, and Linear Algebra World every 5 days. Most recently, PML Engineer Exam Prep was updated on September 28, 2026 and Linear Algebra World on September 13, 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.*