Comparison

Turtle Universe vs fullmoon

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

Head to head
About

Turtle Universe

Explore and learn about scientific phenomena through interactive microworlds. Create your own simulations using text or blocks, and engage with a global community of young learners. Discover over 100 scientific models and create computational art and games.

Highlights
  • Explore 100+ scientific models
  • Create custom microworlds
  • Code with text or blocks
  • Investigate phenomena
  • Engage in global discussions
  • Create computational art and games
Features
Read full description

Dive into the mesmerizing world of Turtle Universe, where you can explore and learn about various social and scientific phenomena through captivating microworlds. Unleash your creativity by coding your own microworlds with text or blocks, and join lively discussions with young learners across the globe! 1) Discover over 100 intriguing scientific models from diverse fields – with even more on the way! 2) Investigate phenomena such as traffic jams, predator-prey interactions, and the blooming of flowers. 3) Immerse yourself in enthralling storylines within the microworlds. 4) Create and play with stunning computational art and addictive games just for fun! Inspired by NetLogo, the leading multi-agent programmable modeling environment, Turtle Universe brings the limitless power of computational modeling to smartphones and tablets of young students and educators like you! Experience genuine scientific modeling shared by countless researchers and students worldwide. Turtle Universe supports most NetLogo, NetLogo Web, and NetTango models right from the start. From the creators of Physics Lab, a physics experiment simulation app loved by over 3 million learners and teachers. =========================== Term of Use: https://static.turtlesim.com/products/Term-Of-Use.txt Privacy Policy: https://static.turtlesim.com/products/Privacy-Policy.txt =========================== Copyright 2021 John Chen & Uri Wilensky. All rights reserved. Turtle Universe is authored by John Chen & Uri Wilensky and maintained by CCL at Northwestern University. If you mention the software in a publication, please include the citation below: * Chen, J. & Wilensky, U. (2021). Turtle Universe. Center for Connected Learning and Computer-Based Modeling, Northwestern University, Evanston, IL.

About

fullmoon

This app provides a private and offline way to interact with local large language models. It runs models directly on your device, optimized for Apple silicon, and is available across multiple Apple platforms. Personalize your experience and integrate with other apps via Shortcuts.

Highlights
  • Private LLM chat
  • Fully offline operation
  • On-device model execution
  • Cross-platform Apple support
  • Customizable themes and fonts
  • Shortcut integration
Read full description

the simplest way to use private LLMs: works fully offline and private when you don’t have internet. runs models on-device optimized for Apple silicon. works on every platform: iOS, iPadOS, macOS, visionOS personalize: adjust the theme, fonts, and system prompt in the app. Shortcut: chat with fullmoon or get an output from a local model to use with other actions. free, open source, private.

Screenshots

Turtle Universe4 screens
fullmoon4 screens

Verdict

The call

The clearest difference is update cadence: fullmoon at every 10 days against Turtle Universe's every 6 weeks. fullmoon also leads on review sentiment (78% vs 67%). Turtle Universe's advantage is iOS requirement (13.0 vs 17.6). On price, rating, ratings volume and ads 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

Turtle Universe holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 45 and 100 respectively. Written reviews complicate that: 67% of Turtle Universe's written reviews are positive against 78% of fullmoon's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Turtle Universe ships an update every 6 weeks, fullmoon every 10 days. The most recent releases landed on October 18, 2026 and October 16, 2026 respectively.

Scorecard3 real differences · 7 level
Turtle Universe versus fullmoon: the parameters behind the verdict, then further details
ParameterTurtle Universefullmoon
PriceFreeFree
Rating4.6 (45 ratings) — better4.4 (100 ratings)
Positive reviews66.7% of reviews77.8% of reviews — better
Number of ratings45100 — better
Update frequencyEvery 6 weeksEvery 10 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, Mac, Vision Pro — better
Requires iOS13.0 — better17.6
Further details — not scored
Size120 MB30 MB
Age rating4+17+
DeveloperTurtle Sim LLCMainframe Computer, Inc.

Customer experience

Turtle Universe

All ratings45 ratings
Positive86.7%
Neutral4.4%
Negative8.9%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

fullmoon

All ratings100 ratings
Positive86.0%
Neutral3.0%
Negative11.0%
Written reviews81 reviews
Positive77.8%
Neutral4.9%
Negative17.3%

Bugs and requests

Turtle Universe

Not enough reviews yet to summarise bugs or requests.

fullmoon

Reported bugs

2 issues
  • Incompatibility with iPhone SE2 and iPad Pro Gen3 despite supporting Metal 3
  • Deepseek models not working on some devices

Requested features

6 requests
  • Add support for saving/copying full chat conversations
  • Expand functionality through Shortcuts integration
  • Provide more advanced language models
  • Allow users to remove/delete downloaded models
  • Add support for attaching files and images
Show 1 more
  • Implement voice mode and customizable AI models

In-app purchases

None

Turtle Universe

No in-app purchases

None

fullmoon

No in-app purchases

Questions

Is Turtle Universe free?
Turtle Universe is free to download, with no in-app purchases.
Is fullmoon free?
fullmoon is free to download, with no in-app purchases.
Which has better reviews, Turtle Universe or fullmoon?
Turtle Universe is rated higher. Turtle Universe averages 4.6 out of 5 from 45 ratings, while fullmoon averages 4.4 from 100 ratings.
Do Turtle Universe or fullmoon have ads?
Neither Turtle Universe nor fullmoon shows ads.
Which is updated more often, Turtle Universe or fullmoon?
Turtle Universe ships an update every 6 weeks, and fullmoon every 10 days. Most recently, Turtle Universe was updated on October 18, 2026 and fullmoon on October 16, 2026.

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