# そらまめ vs Ballet Protractor

The clearest difference is in-app purchases: Ballet Protractor at none against そらまめ's 2. Ballet Protractor also leads on update cadence (daily vs weekly). そらまめ's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. そらまめ sells 2 in-app purchases, starting at $2.99 per month. Ballet Protractor asks for nothing beyond the download.

そらまめ ships an update weekly, Ballet Protractor daily. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | そらまめ | Ballet Protractor |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Weekly | **Daily** |
| Size | 74 MB | 60 MB |
| Requires iOS | **14.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [ANTENNA WORKS](https://appshunter.io/developer/1881914213) | [Jungmun Choi](https://appshunter.io/developer/1877873773) |

## What reviewers say

### そらまめ

[App page](https://appshunter.io/ios/app/id6760608307)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Soramame Premium | $2.99 | per month |
| Soramame Premium | $22.99 | per year |


### Ballet Protractor

[App page](https://appshunter.io/ios/app/ballet-protractor-leg-angle/id6782101611)

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

**In-app purchases:** none


## Frequently asked questions

### Is そらまめ free?

そらまめ is free to download, with in-app purchases available.

### Is Ballet Protractor free?

Ballet Protractor is free to download, with no in-app purchases.

### Do そらまめ or Ballet Protractor have ads?

Ballet Protractor shows ads; そらまめ does not.

### Which is updated more often, そらまめ or Ballet Protractor?

そらまめ ships an update weekly, and Ballet Protractor daily. Most recently, そらまめ was updated on October 24, 2026 and Ballet Protractor on October 25, 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.*