# AB LegSize vs Roost.

The clearest difference is in-app purchases: AB LegSize at none against Roost.'s 2. AB LegSize also leads on iOS requirement (16.4 vs 18.0). Roost.'s advantage is update cadence (every 2 weeks vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Roost. sells 2 in-app purchases, starting at $4.99 per month. AB LegSize asks for nothing beyond the download.

AB LegSize ships an update every 2 months, Roost. every 2 weeks. The most recent releases landed on September 15, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | AB LegSize | Roost. |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Size | 6 MB | 7 MB |
| Requires iOS | **16.4** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Alexander Berkovich](https://appshunter.io/developer/1460157188) | [Merit Apps LLC](https://appshunter.io/developer/1885067510) |

## What reviewers say

### AB LegSize

[App page](https://appshunter.io/ios/app/ab-legsize/id6449621193)

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

**In-app purchases:** none


### Roost.

[App page](https://appshunter.io/ios/app/roost/id6769867532)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Roost+ Monthly | $4.99 | per month |
| Roost+ Yearly | $39.99 | per year |


## Frequently asked questions

### Is AB LegSize free?

AB LegSize is free to download, with no in-app purchases.

### Is Roost. free?

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

### Do AB LegSize or Roost. have ads?

Neither AB LegSize nor Roost. shows ads.

### Which is updated more often, AB LegSize or Roost.?

AB LegSize ships an update every 2 months, and Roost. every 2 weeks. Most recently, AB LegSize was updated on September 15, 2026 and Roost. on September 17, 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.*