# LEGO® Boost vs 恺宇 KAIYU

The clearest difference is rating: LEGO® Boost at 4.6 against 恺宇 KAIYU's 3.4. LEGO® Boost also leads on ratings volume (4.3K vs 5). 恺宇 KAIYU's advantage is update cadence (fortnightly vs every 3 months) and iOS requirement (9.0 vs 13.0). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

LEGO® Boost holds the better App Store score, 4.6 against 3.4. That said, the two scores are not equally well evidenced: LEGO® Boost has 4.3K ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 66% of LEGO® Boost's written reviews are positive against 67% of 恺宇 KAIYU's, so the app with the better star average is not the one people write more warmly about.

LEGO® Boost ships an update every 3 months, 恺宇 KAIYU fortnightly. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | LEGO® Boost | 恺宇 KAIYU |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (4.3K ratings)](https://appshunter.io/ios/app/lego-boost/id1217385613/reviews)** | [3.4 (5 ratings)](https://appshunter.io/ios/app/kaiyu/id1512072697/reviews) |
| Number of ratings | **4.3K** | 5 |
| Positive reviews | 65.6% of reviews | **66.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 717 MB | 233 MB |
| Requires iOS | 13.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [LEGO](https://appshunter.io/developer/347363505) | [植川 马](https://appshunter.io/developer/1783803021) |

## What reviewers say

### LEGO® Boost

[App page](https://appshunter.io/ios/app/lego-boost/id1217385613)

Bring your LEGO creations to life with this app. Combine it with the LEGO BOOST Creative Toolbox set to build, code, and play with interactive robots and models. Enjoy over 60 activities and digital building instructions.

**Highlights:** Digital LEGO Building Instructions, Drag-and-drop programming interface, Over 60 fun activities, Build and code custom creations, Control LEGO models with mobile device, Combine with other LEGO sets

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Fun and engaging
- 👍 Great for learning coding
- 🎨 Excellent for creativity
- 💡 Impressive programming options
- 🤖 Enjoyable building experience

**What reviewers complain about**

- 🐛 Connectivity issues
- 🔋 Battery life problems
- 📚 Unclear instructions
- 🤔 Confusing programming interface
- 🔍 Difficulty finding parts

**Reported bugs**

- App crashes and freezes
- Firmware update failures
- Bluetooth connection problems
- Lost progress and build instructions
- Sensor and motor issues

**Requested features**

- More advanced programming blocks
- Ability to save and load projects
- Improved instructions and documentation
- Compatibility with more devices
- Easier part organization


### 恺宇 KAIYU

[App page](https://appshunter.io/ios/app/kaiyu/id1512072697)

This app offers diverse control methods for an engaging experience. Explore options like button remotes, gyroscope control, route drawing, voice commands, and custom graphical programming.

**Highlights:** Multiple control styles, Button remote, Gyroscope control, Route drawing, Voice command control, Custom graphical programming

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is LEGO® Boost free?

LEGO® Boost is free to download, with no in-app purchases.

### Is 恺宇 KAIYU free?

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

### Which has better reviews, LEGO® Boost or 恺宇 KAIYU?

LEGO® Boost is rated higher. LEGO® Boost averages 4.6 out of 5 from 4.3K ratings, while 恺宇 KAIYU averages 3.4 from 5 ratings.

### Do LEGO® Boost or 恺宇 KAIYU have ads?

Neither LEGO® Boost nor 恺宇 KAIYU shows ads.

### Which is updated more often, LEGO® Boost or 恺宇 KAIYU?

LEGO® Boost ships an update every 3 months, and 恺宇 KAIYU fortnightly. Most recently, LEGO® Boost was updated on November 6, 2026 and 恺宇 KAIYU on November 3, 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.*