3 vs ICS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
3
Explore the wonders of gravity with this 2D N-body simulator. Experiment with celestial mechanics, create mesmerizing patterns, and customize your simulations. It's a fun and educational playground for anyone curious about physics.
- Simulate gravity interactions
- Explore preset configurations
- Customize body size, color, and trails
- Educational and fun physics experiments
- Create mesmerizing visual patterns
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Explore the Wonders of Gravity with 3-Body - A 2D N-Body Simulator! Dive into the fascinating world of physics with 3-Body, a unique 2D N-body simulator inspired by the famous “3-Body Problem” in physics (also the book series and now Netflix show). Whether you’re a science enthusiast, a fan of celestial mechanics, or just looking for something cool to play with, 3-Body offers a fun and educational experience. Key Features: • Simulate Gravity: Watch as bodies with mass interact with each other, forming complex and mesmerizing patterns as they move under the influence of gravity. • Preset Configurations: Explore stable configurations such as the figure-eight orbit of three bodies, a circular orbit of three masses, or a large body orbited by smaller ones. • Customization: Unleash your creativity by customizing the size, color, and trails of the bodies you create. Tailor each simulation to your liking and see how it affects the system. • Educational & Fun: While the app is primarily informational, it’s also incredibly fun to experiment with. Whether you’re learning about gravitational physics or just enjoying the visual spectacle, 3-Body has something for everyone. Why 3-Body? 3-Body isn’t just a tool—it’s a playground for your imagination. With no specific goal other than to explore, discover, and enjoy, this app brings the wonders of gravity to your fingertips. Whether you’re a student, a teacher, or just someone curious about the universe, 3-Body is sure to captivate and entertain you. Download 3-Body today and embark on your journey through the cosmos!
ICS
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Do you want to read signal flags confidently, know Morse code and the phonetic alphabet (NATO/ICAO) and speak the language of sailors? This app is your guide to the International Code of Signals (ICS). App features: • A complete set of signals: learn the phonetic alphabet (Alpha, Bravo, Charlie...), signal flags and Morse code. • Correct pronunciation: learn not only to write but also to speak correctly. • Effective memorization: consolidate your knowledge with the help of tests. • Progress and statistics: track your progress in each section and set records in tests. • Works offline: study anywhere: at sea, on a yacht or at home without the Internet. Who is this app for? This app is for sailors and captains, yachtsmen, cadets of maritime educational institutions, radiotelegraph operators and everyone who is interested in the sea. Learn visual and sound signals with the help of tests and voice acting. Download now and start learning the language of the sea.
Screenshots
Verdict
The clearest difference is price: 3 at Free against ICS's $2.99. 3 also leads on update cadence (monthly vs every 9 months) and device support (3 vs 1). On 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
3 is free to download; ICS costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
3 ships an update monthly, ICS every 9 months. The most recent releases landed on October 30, 2026 and November 8, 2026 respectively.
| Parameter | 3 | ICS |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 5.0 (3 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Monthly — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 9 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Cubic Insights LLC | Smirnov Yury |
In-app purchases
3
No in-app purchases
ICS
No in-app purchases









