LEGO® Boost 4+


    • 4.6 • 4.2K Ratings
    • Free


Combine this app with the LEGO® BOOST Creative Toolbox (17101) set to bring your creations to life!
Enjoy more than 60 fun activities with simple drag-n'-drop coding, watch videos and access digital LEGO Building Instructions. Have fun with LEGO models that can move, talk and respond to real-world events.

Take your experience to another level with advanced coding. Build and BOOST your own robot toy creations and control them from your mobile device. All it takes is three simple steps: BUILD, CODE and PLAY!

Is your device compatible?
Please go to to check if your device is compatible. Ask your parents’ permission before going online.

LEGO® BOOST App Feature List
- Access digital LEGO® Building Instructions for all 5 LEGO BOOST models included with the 17101 LEGO BOOST Creative Toolbox.
- BUILD, CODE and PLAY with CODABLE LEGO® models.
- Bring your LEGO® BOOST creations to life with the simple drag-n'-drop PROGRAMMING interface.
- Enjoy more than 60 fun ACTIVITIES.
- Imagine, build and code your own creations. Kick-start your creativity—3 inspirational models included with the app.
- Combine 17101 LEGO BOOST with the LEGO® City 60194 Arctic Scout Truck to control and drive the vehicle! Use the app to operate the forklift, examine samples with the color sensor, help the whale back into the water and much more.
- Combine 17101 LEGO BOOST with LEGO® NINJAGO® 70652 Stormbringer and set the Lightning Dragon free! Use the app to control the fearsome beast, fire the shooters, create a color-sensing ejector seat and much more!

- Go to to check if your device is compatible. Ask your parents’ permission before going online.

LEGO BOOST set (17101) Feature List
- Includes 844 LEGO® pieces, plus a LEGO Move Hub, Interactive Motor and a Color & Distance Sensor.
- Move Hub features Bluetooth Low Energy (BLE) connectivity, 2 encoded motors, activation button, internal tilt sensor and a light.
- Interactive Motor is an encoded motor.
- Color & Distance Sensor detects distance, motion and color, and can also function as a light.
- Create and code Vernie the Robot, Frankie the Cat, the M.T.R.4 (Multi-Tooled Rover 4), the Guitar 4000 and the AutoBuilder.
- Rotate Vernie’s head to activate its shoulder-mounted spring-loaded shooter.
- Build the M.T.R.4 (Multi-Tooled Rover 4) and try out the different tool and customization attachments for an array of exciting activities.
- Learn songs and rock out with the Guitar4000!
- Look after your own pet with Frankie the Cat. Be sure to feed it the right food—or it might get upset!
- Construct, code and operate the AutoBuilder to produce real miniature LEGO® models.
- Build and code robots and models, and complete exciting activities with the playmat and intuitive LEGO® BOOST app.

The LEGO® BOOST Creative Toolbox set (17101) is sold separately.

For app support contact LEGO Consumer Service.
For contact details refer to

Our privacy policy and terms of use for apps are accepted if you download this app.
Read more on and

There’s no third-party advertising. LEGO marketing content and information is served, for instance LEGO news about LEGO sets and other LEGO games, in hope of inspiring children’s creative play.

LEGO and the LEGO logo are trademarks of the LEGO Group. ©2017 The LEGO Group.

What’s New

Version 1.9.8

Maintenance Update

Ratings and Reviews

4.6 out of 5
4.2K Ratings

4.2K Ratings

rayla dragon prince ,

AWSOME!!!But needs to tell you that you need to get the boost remote app.

I love this product. It’s really fun to build and it’s really fun to use. But I think they should tell you that you need to get the boost Remote app. When you search “boost Lego”in the App Store scroll down and you’ll see the boost Lego app picture, then scroll down and you’ll see the Star Wars app picture and again scroll down and you will see boost remote. You will need get the boost remote app for the boost lego app to work. This applies to both the robot boost lego and the Star Wars boost lego. Other wise this app is super fun! Thanks to the lego company for this! I am a huge lego fan and this is my favorite product so far! THANKS SO MUCH!!!!!!!!!!!!! Thanks for reading this! 😊Oh and developers if you can please add a mystery sound it would be AWSOME! The mystery sound is like a random sound. Again thanks for reading!

Developer Response ,

Thanks for taking the time to share your feedback! 😀 We're so happy to hear you're having so much building and programming! Have fun with Vernie. 🤖✨ - Sonia, LEGO® Customer Service

MxsonD ,

Problems (UPDATE)

I just received my BOOST Creative Toolbox and I’ve built the first thing in pack 1. My batteries are perfectly fine but when I try to connect to the app the hub Bluetooth light will flicker every 3 or 4 seconds and not give the app enough time to connect. It’s very annoying and I know it’s something to do with the app. I will update my review if I fix this. ————————— UPDATE: Customer Support was very quick and helpful. I simply held down the green button once the connecting screen came on and it updated the hub. I tried that and it didn’t work with some old batteries I had. It worked once I put new batteries in the hub so may have actually been one of the reasons for the hub messing up.

Developer Response ,

Hi there, we're sorry to hear you're experiencing issues. We're aware of this issue and are working hard to find a solution. Please try doing a firmware update using the LEGO® Powered UP app and reconnecting to the LEGO BOOST app once completed. If that doesn't work, please reach out at and we'll troubleshoot together. 🙂 - Jayare, LEGO® Customer Service

Dr Lori Liv ,

Love The Engineering!!

Everything is so fun to do and create. The multiple things to learn and make are great for children. I use it everyday and the quality has never wavered. I have never had a problem with the app. It was great in every way. I very much recommend it to parents who have children with the love of legos. It’s a great app with many possibilities and new idea to explore every day. New concepts of coding and engineering are learned every time you use it. It’s a wonderful way to use up your time!

Developer Response ,

Wow! Thank you so much for taking the time to leave us such an awesome review. We hope you continue to enjoy the app. 🤖❤️ - Jayare, LEGO® Customer Service

App Privacy

The developer, LEGO, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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