# Smart Protractor vs MarinCompass

The clearest difference is in-app purchases: MarinCompass at none against Smart Protractor's 2. MarinCompass also leads on update cadence (weekly vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Smart Protractor sells 1 one-off in-app purchase. MarinCompass asks for nothing beyond the download.

Smart Protractor ships an update every 2 weeks, MarinCompass weekly. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Smart Protractor | MarinCompass |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Weekly** |
| Size | 8 MB | 1 MB |
| Requires iOS | 17.2 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [Jun Yamabe](https://appshunter.io/developer/1732682049) | [YOSHIKAZU OHORI](https://appshunter.io/developer/6772688659) |

## What reviewers say

### Smart Protractor

[App page](https://appshunter.io/ios/app/smart-protractor/id6746047543)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


### MarinCompass

[App page](https://appshunter.io/ios/app/marincompass/id6806538004)

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

**In-app purchases:** none


## Frequently asked questions

### Is Smart Protractor free?

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

### Is MarinCompass free?

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

### Do Smart Protractor or MarinCompass have ads?

Neither Smart Protractor nor MarinCompass shows ads.

### Which is updated more often, Smart Protractor or MarinCompass?

Smart Protractor ships an update every 2 weeks, and MarinCompass weekly. Most recently, Smart Protractor was updated on October 24, 2026 and MarinCompass on October 29, 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.*