# e vs Smart Protractor

The clearest difference is in-app purchases: e at none against Smart Protractor's 2. e also leads on iOS requirement (13.0 vs 17.2). On price, update cadence, ads and device support there is nothing between them.

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

e ships an update fortnightly, Smart Protractor every 2 weeks. The most recent releases landed on September 17, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | e | Smart Protractor |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Size | 84 MB | 8 MB |
| Requires iOS | **13.0** | 17.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NextDrive Co.](https://appshunter.io/developer/1005329987) | [Jun Yamabe](https://appshunter.io/developer/1732682049) |

## What reviewers say

### e

[App page](https://appshunter.io/ios/app/e-cube/id6468552147)

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is e free?

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

### Is Smart Protractor free?

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

### Do e or Smart Protractor have ads?

Neither e nor Smart Protractor shows ads.

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

e ships an update fortnightly, and Smart Protractor every 2 weeks. Most recently, e was updated on September 17, 2026 and Smart Protractor on September 11, 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.*