fluidity HD vs ChatterPix
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
fluidity HD
Experience a beautiful, real-time fluid dynamics simulation. Control the flow and colors of liquids with intuitive touch gestures. Unlock advanced features like ambient audio and video output through an in-app purchase.
- Real-time fluid dynamics simulation
- Interactive touch controls
- Stunning color customization
- Ambient audio (in-app purchase)
- Snapshot and video output (in-app purchase)
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A beautiful interactive realtime fluid dynamics simulation, control fluid flow and stunning colours at the tips of your fingers. In-App purchase enables ambient audio, double tap screen to take a snapshot, settings storage, and menuless video out using VGA, Component or Composite cable.
ChatterPix
An app that allows users to animate still photos by adding a mouth and voice. Create fun greetings, messages, or cards with customizable stickers, frames, and filters. It's a free tool for creative expression.
- Animate photos with sound
- Add voice recordings
- 22 stickers
- 12 frames
- 11 photo filters
- Create greetings and messages
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Create ChatterPix with friends and family as silly greetings, playful messages, or creative cards. And best of all, it’s FREE! CATEGORY: Creative Expression TOOLS: 22 stickers, 12 frames and 11 photo filters ABOUT DUCK DUCK MOOSE (A subsidiary of Khan Academy) Duck Duck Moose, an award-winning creator of educational mobile apps for families, is a passionate team of engineers, artists, designers, and educators. Founded in 2008, the company has created 21 top-selling titles and has received 21 Parents’ Choice Awards, 18 Children’s Technology Review Awards, 12 Tech with Kids’ Best Pick App Awards, and a KAPi award for “Best Children’s App” at the International Consumer Electronics Show. Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. Duck Duck Moose is now part of the Khan Academy family. Like all Khan Academy offerings, all Duck Duck Moose apps are now 100% free, without ads or subscriptions. For kids ages 2-6, don't miss Khan Academy Kids, our new early learning app to help young children with reading, writing, math and social-emotional development! We’d love to hear from you! Visit us at www.duckduckmoose.com or drop us a line at support@duckduckmoose.com.
Screenshots
Verdict
The clearest difference is rating: ChatterPix at 4.4 against fluidity HD's 3.7. ChatterPix also leads on in-app purchases (none vs 1) and ratings volume (1.7K vs 125). On price, review sentiment, update cadence 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
Both are free to download. fluidity HD sells 1 one-off in-app purchase. ChatterPix asks for nothing beyond the download.
ChatterPix holds the better App Store score, 4.4 against 3.7. That said, the two scores are not equally well evidenced: ChatterPix has 1.7K ratings behind it against 125, so its average is the more settled of the two. Written reviews point the same way: 73% of fluidity HD's written reviews are positive against 78% of ChatterPix's.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 29, 2026 and October 26, 2026 respectively.
| Parameter | fluidity HD | ChatterPix |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (125 ratings) | 4.4 (1.7K ratings) — better |
| Positive reviews | 73.3% of reviews | 78.1% of reviews — better |
| Number of ratings | 125 | 1.7K — better |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 9.0 |
| Further details — not scored | ||
| Size | 24 MB | 69 MB |
| Age rating | 4+ | 12+ |
| Developer | nebulus design | Duck Duck Moose LLC |
Customer experience
fluidity HD
ChatterPix
User reviews
fluidity HD
From 125 App Store ratingsWhat we love
- 🌈 Visually stunning and mesmerizing
- 🧘♀️ Calming and relaxing experience
- 🎨 Vibrant and customizable colors
- 👍 Great for kids and adults
Room to improve
- 🐛 Crashes and freezes on some devices
- 🔇 Lack of audio/music features
- 💰 Paid version not worth the cost
- 🔋 High battery consumption
ChatterPix
From 1.7K App Store ratingsWhat we love
- ⭐️ Lots of fun
- 👍 Easy and intuitive to use
- 🤩 Engaging and creative
- 🎉 Great for school/classroom use
- 🤗 Fun for all ages
Room to improve
- 🐛 Occasional crashes or glitches
- 🔇 Audio/recording issues
- 📏 Difficulty with mouth placement/alignment
- 🔍 Limited customization options
- ⏱️ Short recording time limit
Bugs and requests
fluidity HD
Reported bugs
3 issues- Crashes on double-tap
- Incompatible with newer iOS
- Stuck finger gestures
Requested features
4 requests- Add music/ambient sound options
- Ability to save/export creations
- More customization controls
- Support for latest iOS versions
ChatterPix
Reported bugs
3 issues- Camera function not working for some users
- App signing out/resetting after use
- Frequent crashes or freezing
Requested features
5 requests- Ability to remove watermark/logo
- More sticker/accessory options
- Voice changing/filtering effects
- Longer recording time
- Ability to use existing photos from library
In-app purchases
fluidity HD
- Full Version Unlock$1.99
ChatterPix
No in-app purchases
Questions
Is fluidity HD free?
Is ChatterPix free?
Which has better reviews, fluidity HD or ChatterPix?
Do fluidity HD or ChatterPix have ads?
Which is updated more often, fluidity HD or ChatterPix?
Other comparisons
