Comparison

Gloop FREE vs LEGO® Boost

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Gloop FREE

Explore a unique interactive simulation of a viscous, glowing substance. Manipulate its properties by stirring or treating it gently to create dynamic visual effects and even shape it. Supports real-time warping of photos, images, and video on compatible devices.

Highlights
  • Interactive molecular simulation
  • Dynamic glowing effects
  • Viscosity and solidification control
  • Photo and image warping
  • Real-time video warping
Features
Read full description

"Gloop" sits somewhere in that improbable space between an interactive lava lamp, foam resting on water and alien clouds lit by the setting sun(s). Whatever it is, as you stir this bizarre mix thousands of virtual molecules collide with each other, sticking and slipping. This generates heat causing the gloop to glow and become less viscous. If you treat the gloop more gently it cools and solidifies allowing you to give it form. Gloop FREE now features warping of photos, images and real time video on iPhone 3GS+, iPod 3rd Gen+ and iPad+. Photos and real time video require a device with a camera. ------------ Also by RunSwimFly - "Germs" and "Germs FREE" - the liquid physics engine of "Gloop" employed in a game of microbial conquest.

About

LEGO® Boost

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
Read full description

The LEGO® Boost app is available for download until January 1st 2027. 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 LEGO.com/devicecheck 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 LEGO.com/devicecheck 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 http://service.lego.com/contactus Our privacy policy and terms of use for apps are accepted if you download this app. Read more on http://aboutus.lego.com/legal-notice/Privacy-Policy and http://aboutus.lego.com/legal-notice/terms-of-use-for-apps 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.

Screenshots

Gloop FREE4 screens
LEGO® Boost4 screens

Verdict

The call

The clearest difference is rating: LEGO® Boost at 4.6 against Gloop FREE's 4.1. LEGO® Boost also leads on ratings volume (4.3K vs 57). Gloop FREE's advantage is review sentiment (83% vs 66%) and iOS requirement (4.3 vs 13.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

LEGO® Boost holds the better App Store score, 4.6 against 4.1. That said, the two scores are not equally well evidenced: LEGO® Boost has 4.3K ratings behind it against 57, so its average is the more settled of the two. Written reviews complicate that: 83% of Gloop FREE's written reviews are positive against 66% of LEGO® Boost's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Gloop FREE ships an update every 5 months, LEGO® Boost every 3 months. Both last shipped on November 6, 2026.

Scorecard4 real differences · 6 level
Gloop FREE versus LEGO® Boost: the parameters behind the verdict, then further details
ParameterGloop FREELEGO® Boost
PriceFreeFree
Rating4.1 (57 ratings)4.6 (4.3K ratings) — better
Positive reviews82.9% of reviews — better65.6% of reviews
Number of ratings574.3K — better
Update frequencyEvery 5 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS4.3 — better13.0
Further details — not scored
Size0 MB717 MB
Age rating4+4+
DeveloperRunSwimFlyLEGO

Customer experience

Gloop FREE

All ratings58 ratings
Positive77.6%
Neutral1.7%
Negative20.7%
Written reviews117 reviews
Positive82.9%
Neutral6.8%
Negative10.3%

LEGO® Boost

All ratings4,261 ratings
Positive90.7%
Neutral3.0%
Negative6.3%
Written reviews392 reviews
Positive65.6%
Neutral8.4%
Negative26.0%

User reviews

Gloop FREE

From 57 App Store ratings

What we love

  • 😊 Highly addictive and entertaining
  • 🎨 Mesmerizing fluid physics simulation
  • 💰 Free with no ads
  • 🎮 Relaxing and stress-relieving
  • 🎯 Simple yet engaging gameplay

Room to improve

  • 🐛 Crashes after extended play sessions
  • 📉 Graphics quality is blurry
  • 🔧 Difficult to manipulate without tearing
  • ⚠️ Compatibility issues with newer devices
  • 🔊 No sound effects

LEGO® Boost

From 4.3K App Store ratings

What we love

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

Room to improve

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

Bugs and requests

Gloop FREE

Reported bugs

9 issues
  • App unavailable on modern iOS devices
  • Crashes on iPad after 5+ minutes of play
  • Accelerometer malfunction on iPhone 4
  • Blurry graphics during gameplay
  • Goop turns yellow and becomes uncontrollable when touched
Show 4 more
  • Goop dissipates unexpectedly
  • Landscape mode doesn't work properly
  • Full version not available for iPod Touch
  • Color changes to blue after brief time in lite version

Requested features

13 requests
  • Gravity and tilt controls
  • Sound effects for interactions
  • Thicker, more viscous goop consistency
  • More goop quantity
  • Additional shapes and particle types
Show 8 more
  • Game levels or progression system
  • Multiplayer functionality
  • HD graphics upgrade
  • Ability to insert pictures
  • Background color customization
  • Landscape screen support
  • Firework sounds on explosions
  • Smaller globs absorption mechanic

LEGO® Boost

Reported bugs

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

Requested features

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

In-app purchases

None

Gloop FREE

No in-app purchases

None

LEGO® Boost

No in-app purchases

Questions

Is Gloop FREE free?
Gloop FREE is free to download, with no in-app purchases.
Is LEGO® Boost free?
LEGO® Boost is free to download, with no in-app purchases.
Which has better reviews, Gloop FREE or LEGO® Boost?
LEGO® Boost is rated higher. Gloop FREE averages 4.1 out of 5 from 57 ratings, while LEGO® Boost averages 4.6 from 4.3K ratings.
Do Gloop FREE or LEGO® Boost have ads?
Neither Gloop FREE nor LEGO® Boost shows ads.
Which is updated more often, Gloop FREE or LEGO® Boost?
Gloop FREE ships an update every 5 months, and LEGO® Boost every 3 months. Most recently, Gloop FREE was updated on November 6, 2026 and LEGO® Boost on November 6, 2026.

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