# Improve Vocabulary vs Math Machine

The clearest difference is in-app purchases: Math Machine at none against Improve Vocabulary's 2. Math Machine also leads on update cadence (every 2 days vs every 3 weeks) and iOS requirement (13.0 vs 18.1). On price, ads and device support there is nothing between them.

Both are free to download. Improve Vocabulary sells 2 in-app purchases, starting at $4.99 per month. Math Machine asks for nothing beyond the download.

Improve Vocabulary ships an update every 3 weeks, Math Machine every 2 days. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Improve Vocabulary | Math Machine |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Size | 23 MB | 29 MB |
| Requires iOS | 18.1 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [LEO FLOISSAC](https://appshunter.io/developer/1797344964) | [Viet Anh Bui](https://appshunter.io/developer/6772413131) |

## What reviewers say

### Improve Vocabulary

[App page](https://appshunter.io/ios/app/improve-vocabulary-onceaday/id6742197008)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OnceADay Premium (1 month) | $4.99 | per month |
| OnceADay Premium (1 year) | $29.99 | per year |


### Math Machine

[App page](https://appshunter.io/ios/app/math-machine-vn/id6772413129)

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

**In-app purchases:** none


## Frequently asked questions

### Is Improve Vocabulary free?

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

### Is Math Machine free?

Math Machine is free to download, with no in-app purchases.

### Do Improve Vocabulary or Math Machine have ads?

Neither Improve Vocabulary nor Math Machine shows ads.

### Which is updated more often, Improve Vocabulary or Math Machine?

Improve Vocabulary ships an update every 3 weeks, and Math Machine every 2 days. Most recently, Improve Vocabulary was updated on October 30, 2026 and Math Machine on October 28, 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.*