Comparison

3 vs iVocabulary Pro

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

Head to head
About

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.

Highlights
  • Simulate gravity interactions
  • Explore preset configurations
  • Customize body size, color, and trails
  • Educational and fun physics experiments
  • Create mesmerizing visual patterns
Features
Read full description

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!

About

iVocabulary Pro

Features
Read full description

iVocabulary is the perfect companion to help you learn vocabulary quickly, efficiently, and flexibly. Whether you're preparing for exams, learning a new language, or expanding your vocabulary, iVocabulary adapts to your needs. ATTENTION: This is the pro version of iVocabulary as a one-time payed app for schools and companies. Please pick free iVocabulary if you want to test it before paying or rather pay monthly or yearly. Features: - Relies on the popular ProVoc file format: keep your precious vocabulary collection - Efficient Learning: Intelligent repetition algorithms.- Rich Media: Use rich text and add images and audio to your words. - Rich Media: Use rich text and add images and audio to your words. - Fully Customizable: Create your own vocabulary lists or use ready-made sets. - Seamless Sync: Access your data anytime, anywhere. - Progress Tracking: Monitor your achievements and stay motivated. - Easy Imports: Supports popular vocabulary file formats: ProVoc, ... Learn smarter, not harder – download iVocabulary today and reach your language goals! ----- Legal Notice ----- Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

34 screens
iVocabulary Pro4 screens

Verdict

The call

The clearest difference is price: 3 at Free against iVocabulary Pro's $49.99. 3 also leads on iOS requirement (15.0 vs 17.0). On update cadence, ads, in-app purchases and device support 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

3 is free to download; iVocabulary Pro costs $49.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

3 ships an update monthly, iVocabulary Pro every 3 weeks. The most recent releases landed on October 22, 2026 and October 30, 2026 respectively.

Scorecard2 real differences · 8 level
3 versus iVocabulary Pro: the parameters behind the verdict, then further details
Parameter3iVocabulary Pro
PriceFree — better$49.99
Rating5.0 (3 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings3 — better—
Update frequencyMonthlyEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.0 — better17.0
Further details — not scored
Size9 MB64 MB
Age rating4+4+
DeveloperCubic Insights LLCChristian Beer

In-app purchases

None

3

No in-app purchases

None

iVocabulary Pro

No in-app purchases

Questions

Is 3 free?
3 is free to download, with no in-app purchases.
Is iVocabulary Pro free?
iVocabulary Pro costs $49.99, with no in-app purchases.
Do 3 or iVocabulary Pro have ads?
Neither 3 nor iVocabulary Pro shows ads.
Which is updated more often, 3 or iVocabulary Pro?
3 ships an update monthly, and iVocabulary Pro every 3 weeks. Most recently, 3 was updated on October 22, 2026 and iVocabulary Pro on October 30, 2026.

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