# KYOSHO EGG vs Smart Protractor

The clearest difference is in-app purchases: KYOSHO EGG at none against Smart Protractor's 2. KYOSHO EGG also leads on iOS requirement (11.0 vs 17.2). Smart Protractor's advantage is update cadence (every 2 weeks vs every 3 months). On price, ads and device support there is nothing between them.

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

KYOSHO EGG ships an update every 3 months, Smart Protractor every 2 weeks. The most recent releases landed on October 14, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | KYOSHO EGG | Smart Protractor |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Size | 62 MB | 8 MB |
| Requires iOS | **11.0** | 17.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [ShanTou City Vison Electronictechnology Co., Ltd.](https://appshunter.io/developer/1388222999) | [Jun Yamabe](https://appshunter.io/developer/1732682049) |

## What reviewers say

### KYOSHO EGG

[App page](https://appshunter.io/ios/app/kyosho-egg/id1501306335)

**Features:** macOS Compatibility

**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 KYOSHO EGG free?

KYOSHO EGG 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 KYOSHO EGG or Smart Protractor have ads?

Neither KYOSHO EGG nor Smart Protractor shows ads.

### Which is updated more often, KYOSHO EGG or Smart Protractor?

KYOSHO EGG ships an update every 3 months, and Smart Protractor every 2 weeks. Most recently, KYOSHO EGG was updated on October 14, 2026 and Smart Protractor on October 24, 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.*