Comparison

Two Links Double Pendulum vs ChattyAI

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

Head to head
About

Two Links Double Pendulum

Features
Read full description

Two Links brings one of physics' most beautiful chaotic systems to life. Watch a double pendulum swing, twist, and spiral in real-time 3D — then place it on your floor in Augmented Reality and walk around it. Features • Real-time double pendulum physics (RK4 integration) • AR mode — anchor the pendulum on any flat surface • Orbit the 3D scene freely or let it run hands-free • Adjust link length, pivot position, density, and color • Particle trail from the second link tip • Night sky environment with the Moon and Earth • Pause, shuffle, and watch the chaos reset

About

ChattyAI

Engage with an advanced AI chatbot featuring diverse personas and a convenient keyboard extension. Enjoy private, ad-free conversations stored locally without needing an account.

Highlights
  • Advanced language model interaction
  • Variety of unique AI personas
  • Keyboard extension for in-app use
  • Local conversation storage for privacy
  • No account creation required
  • Ad-free and distraction-free experience
Features
Read full description

Discover ChattyAI, the ultimate chatbot app that enables you to interact with one of the most advanced language models in the world. With our app, you can choose from a variety of personas, each with its unique personality and communication style. And the best part? You only have to pay once, and we promise there are no ads or unnecessary distractions. Our popular personas range from a German teacher to a Love guru, Roast me AI, and Debate AI, among others. Pick the persona that resonates with you and start chatting right away. All your conversations are stored locally on your device, ensuring complete privacy and convenience. With ChattyAI, you don't need to worry about creating an account to use the app. Simply download and start chatting with our intelligent chatbot. Our user-friendly interface and intuitive design make it easy to use the app, so you can enjoy a personalized and private chatting experience. Moreover, ChattyAI offers a keyboard extension that allows you to use the app anywhere, in any application, making it easy to switch between chatting and other tasks on your device. This feature provides you with even more flexibility and convenience, giving you the freedom to communicate with our intelligent chatbot seamlessly. In summary, if you're looking for a fun and personalized chat experience without any hassle, download ChattyAI today and explore our wide range of personas! Features: - No account creation is required – simply download and start chatting. - Interact with one of the most advanced language models in the world. - Choose from a variety of personas, each with a unique personality and communication style. - No ads or unnecessary distractions. - Popular personas include German teacher, Love guru, Roast me AI, Debate AI, and more. - Enjoy personalized and private conversations stored locally on your device. - User-friendly interface and intuitive design for easy use. - Keyboard extension allows chatting within any application for seamless multitasking. - Complete privacy and convenience, with all conversations stored on your device. - Explore a wide range of personas to find the one that resonates with you. - Experience a fun and personalized chat experience with ChattyAI. "ChattyAI" adhere's to Apple Standard End User License Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Two Links Double Pendulum3 screens
ChattyAI4 screens

Verdict

The call

The clearest difference is in-app purchases: Two Links Double Pendulum at none against ChattyAI's 3. ChattyAI's advantage is update cadence (every 3 weeks vs every 47 months) and iOS requirement (16.2 vs 18.2). On price, ads 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

Both are free to download. ChattyAI sells 3 in-app purchases, starting at $0.99 per 7 days. Two Links Double Pendulum asks for nothing beyond the download.

UpkeepUpdate frequency

Two Links Double Pendulum ships an update every 47 months, ChattyAI every 3 weeks. Both last shipped on November 3, 2026.

Scorecard3 real differences · 6 level
Two Links Double Pendulum versus ChattyAI: the parameters behind the verdict, then further details
ParameterTwo Links Double PendulumChattyAI
PriceFreeFree
Rating—5.0 (2 ratings) — better
Number of ratings—2 — better
Update frequencyEvery 47 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.216.2 — better
Further details — not scored
Size281 MB5 MB
Age rating4+17+
DeveloperEliott RadcliffeWorathiti Manosroi

In-app purchases

None

Two Links Double Pendulum

No in-app purchases

3 purchases

ChattyAI

Subscriptions3
  • Weekly$0.997 Days
  • Monthly$2.991 Month
  • Yearly$17.991 Year

Questions

Is Two Links Double Pendulum free?
Two Links Double Pendulum is free to download, with no in-app purchases.
Is ChattyAI free?
ChattyAI is free to download, with in-app purchases available.
Do Two Links Double Pendulum or ChattyAI have ads?
Neither Two Links Double Pendulum nor ChattyAI shows ads.
Which is updated more often, Two Links Double Pendulum or ChattyAI?
Two Links Double Pendulum ships an update every 47 months, and ChattyAI every 3 weeks. Most recently, Two Links Double Pendulum was updated on November 3, 2026 and ChattyAI on November 3, 2026.

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