# Fluid Simulation vs 3D Hourglass Timer

The clearest difference is ads: 3D Hourglass Timer at none against Fluid Simulation's shown. Fluid Simulation's advantage is update cadence (daily vs every 6 weeks) and ratings volume (90K vs 30). On price, rating, in-app purchases and monetization model 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 3D Hourglass Timer sells 2 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 4.7 for 3D Hourglass Timer. That said, the two scores are not equally well evidenced: Fluid Simulation has 90K ratings behind it against 30, 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 73% of 3D Hourglass Timer's.

Fluid Simulation ships an update daily, 3D Hourglass Timer every 6 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Fluid Simulation | 3D Hourglass Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (90K ratings)](https://appshunter.io/ios/app/fluid-simulation-antistress/id1443124993/reviews)** | [4.7 (30 ratings)](https://appshunter.io/ios/app/3d-hourglass-timer/id6741709041/reviews) |
| Number of ratings | **90K** | 30 |
| Positive reviews | **96.2% of reviews** | 72.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Daily** | Every 6 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 69 MB | 177 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) | [Kyohei Hosono](https://appshunter.io/developer/1089376066) |

## 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


### 3D Hourglass Timer

[App page](https://appshunter.io/ios/app/3d-hourglass-timer/id6741709041)

Experience a moment of luxury and tranquility with a beautifully designed app featuring 3D hourglasses. Enhance meditation, relaxation, and focus with customizable timers, soothing sounds, and calming music.

**Highlights:** Beautifully designed 3D hourglasses, 360° sand flow visualization, Timer from 1 to 180 minutes, Soothing sand and background sounds, Focus-boosting study timer, Elegant and luxurious design

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Moon Timer | $1.99 | one-time |
| Jellyfish Hourglass | $1.99 | one-time |


## Frequently asked questions

### Is Fluid Simulation free?

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

### Is 3D Hourglass Timer free?

3D Hourglass Timer is free to download, with in-app purchases available.

### Which has better reviews, Fluid Simulation or 3D Hourglass Timer?

Fluid Simulation is rated higher. Fluid Simulation averages 4.9 out of 5 from 90K ratings, while 3D Hourglass Timer averages 4.7 from 30 ratings.

### Do Fluid Simulation or 3D Hourglass Timer have ads?

Fluid Simulation shows ads; 3D Hourglass Timer does not.

### Which is updated more often, Fluid Simulation or 3D Hourglass Timer?

Fluid Simulation ships an update daily, and 3D Hourglass Timer every 6 weeks. Most recently, Fluid Simulation was updated on October 25, 2026 and 3D Hourglass Timer on October 24, 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.*