# Linear Algebra vs ONDA REPLAY

The clearest difference is in-app purchases: Linear Algebra at none against ONDA REPLAY's 4. ONDA REPLAY's advantage is ads (none vs shown) and update cadence (every 5 days vs every 6 weeks). On price and device support there is nothing between them.

Both are free to download. ONDA REPLAY sells 4 in-app purchases, starting at $8.99 per month. Linear Algebra asks for nothing beyond the download.

Linear Algebra ships an update every 6 weeks, ONDA REPLAY every 5 days. The most recent releases landed on October 1, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Linear Algebra | ONDA REPLAY |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Every 5 days** |
| Size | 8 MB | 73 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ALG Software Lab](https://appshunter.io/developer/1650561236) | [David Richardson](https://appshunter.io/developer/1813626632) |

## What reviewers say

### Linear Algebra

[App page](https://appshunter.io/ios/app/linear-algebra-matrix-solver/id1660933354)

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

**In-app purchases:** none


### ONDA REPLAY

[App page](https://appshunter.io/ios/app/onda-replay/id6759813764)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ONDA Replay Monthly | $8.99 | per month |
| ONDA Presenter | $99.99 | per 6 months |
| ONDA File | $4.99 | one-time |
| 5-Hour Transcription Block | $5.99 | one-time |


## Frequently asked questions

### Is Linear Algebra free?

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

### Is ONDA REPLAY free?

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

### Do Linear Algebra or ONDA REPLAY have ads?

Linear Algebra shows ads; ONDA REPLAY does not.

### Which is updated more often, Linear Algebra or ONDA REPLAY?

Linear Algebra ships an update every 6 weeks, and ONDA REPLAY every 5 days. Most recently, Linear Algebra was updated on October 1, 2026 and ONDA REPLAY on October 16, 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.*