# Fluid Simulation vs Sloth Rate

The clearest difference is review sentiment: Fluid Simulation at 96% against Sloth Rate's 50%. Fluid Simulation also leads on rating (4.9 vs 3.8) and update cadence (daily vs every 12 months). Sloth Rate's advantage is in-app purchases (none vs 15) and ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Fluid Simulation sells 15 in-app purchases, starting at $1.00 per 7 days. Sloth Rate asks for nothing beyond the download.

Fluid Simulation holds the better App Store score, 4.9 against 3.8. That said, the two scores are not equally well evidenced: Fluid Simulation has 90K ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 96% of Fluid Simulation's written reviews are positive against 50% of Sloth Rate's.

Fluid Simulation ships an update daily, Sloth Rate every 12 months. The most recent releases landed on October 20, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Fluid Simulation | Sloth Rate |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (90K ratings)](https://appshunter.io/ios/app/fluid-simulation-antistress/id1443124993/reviews)** | [3.8 (4 ratings)](https://appshunter.io/ios/app/sloth-rate-activity-tracker/id1605805896/reviews) |
| Number of ratings | **90K** | 4 |
| Positive reviews | **96.2% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Daily** | Every 12 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 69 MB | 2 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pavel Dobryakov](https://appshunter.io/developer/1443124992) | [Polina Portova](https://appshunter.io/developer/1605805898) |

## What reviewers say

### Fluid Simulation

[App page](https://appshunter.io/ios/app/fluid-simulation-antistress/id1443124993)

Engage with mesmerizing fluid dynamics simulations on your device. This app offers a visually stunning and calming experience, perfect for stress relief and relaxation. Explore swirling liquids and gases with simple touch controls.

**Highlights:** Interactive fluid dynamics, Stress relief and calming experience, Gorgeous visuals, Simple touch controls, Liquid, gas, and water simulation, Psychedelic and trippy visuals

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (15)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fluid Premium | $1.00 | per 7 days |
| Fluid Premium | $3.00 | per month |
| Premium | $4.99 | per year |
| Fluid Premium | $6.00 | per month |
| Fluid Premium | $10.00 | per year |
| Premium | $0.49 | one-time |
| Particles | $0.99 | one-time |
| Particles | $1.99 | one-time |
| Fluid Premium | $3.00 | one-time |
| Fluid Simulation | $3.69 | one-time |
| Fluid Premium | $20.00 | one-time |
| Fluid Simulation | $23.00 | one-time |
| Discount | $29.99 | one-time |
| Fluid Premium | $30.00 | one-time |
| Fluid Simulation | $33.00 | one-time |

**What reviewers like**

- 🌈 Beautiful and mesmerizing visuals
- 🧘‍♀️ Calming and relaxing experience
- 👍 Intuitive and easy to use
- 🎨 Customizable settings and presets
- ⭐️ High-quality graphics and animations

**What reviewers complain about**

- 💰 Premium features locked behind paywall
- 🔒 Limited customization options in free version
- 🐛 Occasional crashes or performance issues
- 📱 Smaller screen size can make controls tricky

**Reported bugs**

- Subscription issues and inability to access premium features
- Crashes or freezes when changing certain settings

**Requested features**

- Ability to save and share custom presets
- Option to change background color
- Slower animation speed for more control
- Integration with music or audio playback
- Support for larger screens and TVs


### Sloth Rate

[App page](https://appshunter.io/ios/app/sloth-rate-activity-tracker/id1605805896)

This app interprets your daily step count by applying unique human-to-sloth algorithms. It provides humorous summaries of your activity levels and allows you to review past data through a calendar feature. Embrace a less serious approach to your fitness tracking.

**Highlights:** Connects to Health data, Analyzes daily step count, Human-to-sloth interpretation, Funny activity summaries, Calendar for past data

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Fluid Simulation free?

Fluid Simulation is free to download, with in-app purchases available.

### Is Sloth Rate free?

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

### Which has better reviews, Fluid Simulation or Sloth Rate?

Fluid Simulation is rated higher. Fluid Simulation averages 4.9 out of 5 from 90K ratings, while Sloth Rate averages 3.8 from 4 ratings.

### Do Fluid Simulation or Sloth Rate have ads?

Fluid Simulation shows ads; Sloth Rate does not.

### Which is updated more often, Fluid Simulation or Sloth Rate?

Fluid Simulation ships an update daily, and Sloth Rate every 12 months. Most recently, Fluid Simulation was updated on October 20, 2026 and Sloth Rate on October 6, 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.*