# fluidity HD vs ChatterPix

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.

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.

## The numbers

| Metric | fluidity HD | ChatterPix |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (125 ratings)](https://appshunter.io/ios/app/fluidity-hd/id399403909/reviews) | **[4.4 (1.7K ratings)](https://appshunter.io/ios/app/chatterpix-duck-duck-moose/id734038526/reviews)** |
| Number of ratings | 125 | **1.7K** |
| Positive reviews | 73.3% of reviews | **78.1% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 24 MB | 69 MB |
| Requires iOS | **8.0** | 9.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [nebulus design](https://appshunter.io/developer/351409194) | [Duck Duck Moose LLC](https://appshunter.io/developer/303076298) |

## What reviewers say

### fluidity HD

[App page](https://appshunter.io/ios/app/fluidity-hd/id399403909)

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.

**Highlights:** Real-time fluid dynamics simulation, Interactive touch controls, Stunning color customization, Ambient audio (in-app purchase), Snapshot and video output (in-app purchase)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version Unlock | $1.99 | one-time |

**What reviewers like**

- 🌈 Visually stunning and mesmerizing
- 🧘‍♀️ Calming and relaxing experience
- 🎨 Vibrant and customizable colors
- 👍 Great for kids and adults

**What reviewers complain about**

- 🐛 Crashes and freezes on some devices
- 🔇 Lack of audio/music features
- 💰 Paid version not worth the cost
- 🔋 High battery consumption

**Reported bugs**

- Crashes on double-tap
- Incompatible with newer iOS
- Stuck finger gestures

**Requested features**

- Add music/ambient sound options
- Ability to save/export creations
- More customization controls
- Support for latest iOS versions


### ChatterPix

[App page](https://appshunter.io/ios/app/chatterpix-duck-duck-moose/id734038526)

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.

**Highlights:** Animate photos with sound, Add voice recordings, 22 stickers, 12 frames, 11 photo filters, Create greetings and messages

**In-app purchases:** none

**What reviewers like**

- ⭐️ Lots of fun
- 👍 Easy and intuitive to use
- 🤩 Engaging and creative
- 🎉 Great for school/classroom use
- 🤗 Fun for all ages

**What reviewers complain about**

- 🐛 Occasional crashes or glitches
- 🔇 Audio/recording issues
- 📏 Difficulty with mouth placement/alignment
- 🔍 Limited customization options
- ⏱️ Short recording time limit

**Reported bugs**

- Camera function not working for some users
- App signing out/resetting after use
- Frequent crashes or freezing

**Requested features**

- Ability to remove watermark/logo
- More sticker/accessory options
- Voice changing/filtering effects
- Longer recording time
- Ability to use existing photos from library


## Frequently asked questions

### Is fluidity HD free?

fluidity HD is free to download, with in-app purchases available.

### Is ChatterPix free?

ChatterPix is free to download, with no in-app purchases.

### Which has better reviews, fluidity HD or ChatterPix?

ChatterPix is rated higher. fluidity HD averages 3.7 out of 5 from 125 ratings, while ChatterPix averages 4.4 from 1.7K ratings.

### Do fluidity HD or ChatterPix have ads?

Neither fluidity HD nor ChatterPix shows ads.

### Which is updated more often, fluidity HD or ChatterPix?

fluidity HD ships an update every 2 months, and ChatterPix every 2 months. Most recently, fluidity HD was updated on October 29, 2026 and ChatterPix on October 26, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*