# Fluid Simulation vs Do Nothing.

The clearest difference is update cadence: Fluid Simulation at every 2 days against Do Nothing.'s every 7 months. Fluid Simulation also leads on ratings volume (90K vs 248) and review sentiment (96% vs 78%). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Fluid Simulation sells 15 in-app purchases, starting at $1.00 per 7 days and Do Nothing. sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.9 for Fluid Simulation against 4.8 for Do Nothing.. That said, the two scores are not equally well evidenced: Fluid Simulation has 90K ratings behind it against 248, so its average is the more settled of the two. Written reviews are what separate them: 96% of Fluid Simulation's written reviews are positive against 78% of Do Nothing.'s.

Fluid Simulation ships an update every 2 days, Do Nothing. every 7 months. The most recent releases landed on October 26, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Fluid Simulation | Do Nothing. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (90K ratings)](https://appshunter.io/ios/app/fluid-simulation-antistress/id1443124993/reviews)** | [4.8 (248 ratings)](https://appshunter.io/ios/app/do-nothing/id6443578960/reviews) |
| Number of ratings | **90K** | 248 |
| Positive reviews | **96.2% of reviews** | 77.6% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Every 7 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 70 MB | 39 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pavel Dobryakov](https://appshunter.io/developer/1443124992) | [ponos corporation](https://appshunter.io/developer/297248421) |

## 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


### Do Nothing.

[App page](https://appshunter.io/ios/app/do-nothing/id6443578960)

This app encourages users to take a break from their busy lives and simply do nothing. It provides a dedicated space to rest the brain, organize thoughts, and assess feelings without the distraction of other applications. The goal is to promote mental well-being by allowing for moments of quiet reflection.

**Highlights:** Dedicated 'do nothing' time, Brain rest and relaxation, Thought organization, Feeling assessment, No other app usage rule

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Set Time Freely | $0.99 | one-time |
| No Ads | $0.99 | one-time |
| Focus Mode | $0.99 | one-time |

**What reviewers like**

- 🧠 Helps reduce brain rot and improve attention span
- 🧘‍♀️ Promotes relaxation and mindfulness
- 🎨 Unique and creative concept
- 🔍 Honest and straightforward app name
- 🤩 Visually appealing and enjoyable to use

**What reviewers complain about**

- 💰 Presence of ads and in-app purchases disrupts the experience
- 🤔 Might not be everyone's preferred method of stress relief


## Frequently asked questions

### Is Fluid Simulation free?

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

### Is Do Nothing. free?

Do Nothing. is free to download, with in-app purchases available.

### Which has better reviews, Fluid Simulation or Do Nothing.?

Fluid Simulation is rated higher. Fluid Simulation averages 4.9 out of 5 from 90K ratings, while Do Nothing. averages 4.8 from 248 ratings.

### Do Fluid Simulation or Do Nothing. have ads?

Both Fluid Simulation and Do Nothing. show ads.

### Which is updated more often, Fluid Simulation or Do Nothing.?

Fluid Simulation ships an update every 2 days, and Do Nothing. every 7 months. Most recently, Fluid Simulation was updated on October 26, 2026 and Do Nothing. on October 21, 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.*