# Fluids & Particle Simulation vs Gentle Timer

The clearest difference is ratings volume: Fluids & Particle Simulation at 776 against Gentle Timer's 1. Fluids & Particle Simulation also leads on device support (4 vs 2) and iOS requirement (13.0 vs 17.0). Gentle Timer's advantage is rating (5.0 vs 4.7). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Fluids & Particle Simulation sells 8 in-app purchases, starting at $2.99 per 7 days and Gentle Timer sells 3 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Gentle Timer holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Fluids & Particle Simulation has 776 ratings behind it against 1, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on November 3, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Fluids & Particle Simulation | Gentle Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (776 ratings)](https://appshunter.io/ios/app/fluids-and-particle-simulation/id1532653221/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/gentle-timer-kids-wake-clock/id6749535492/reviews)** |
| Number of ratings | **776** | 1 |
| Positive reviews | 89.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 189 MB | 63 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ZipoApps](https://appshunter.io/developer/1671444635) | [BigBalli Consulting llc](https://appshunter.io/developer/363765325) |

## What reviewers say

### Fluids & Particle Simulation

[App page](https://appshunter.io/ios/app/fluids-and-particle-simulation/id1532653221)

Create mesmerizing, psychedelic fluid art with your fingertips. This app offers a calming and creative outlet to reduce stress and channel negative emotions into beautiful, flowing patterns. Enjoy a unique ASMR experience with sound-reactive visuals and customizable parameters.

**Highlights:** Interactive fluid art simulation, Sound-reactive fluids, Dozens of customizable parameters, Autopilot mode, Gyrosensor and haptic feedback integration, Real-time sound synthesis, Video recording and screenshot functionality

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all features | $2.99 | per 7 days |
| Unlock all \| monthly premium | $5.99 | per month |
| Fluids PRO | $17.99 | per year |
| Unlock all Presets (iOS) | $1.99 | one-time |
| Unlock all Presets (OS X Mac) | $2.99 | one-time |
| Unlock all features | $14.99 | one-time |
| Psychedelic magic (OS X Mac) | $24.99 | one-time |
| Psychedelic magic (iOS) | $44.99 | one-time |

**What reviewers like**

- 🚀 Mesmerizing visuals
- 👍 Relaxing and calming experience
- 🎨 Customizable color and fluid effects
- 🎶 Enjoyable audio/music integration
- 💡 Innovative and creative app concept

**What reviewers complain about**

- 🐛 Occasional crashes or bugs
- 🔋 Device overheating issues
- 💰 Paid features may be too expensive
- 🔇 Lack of volume/audio control options

**Reported bugs**

- Microphone input not working as expected
- Difficulty resetting or restoring default settings

**Requested features**

- Ability to sync visuals with external audio/music
- More preset options and visual effects
- Improved UI/UX for settings and controls
- Support for casting to external displays


### Gentle Timer

[App page](https://appshunter.io/ios/app/gentle-timer-kids-wake-clock/id6749535492)

This app helps children visualize time passing with a customizable image that gradually appears as a timer counts down. It's designed for calm routines like bedtime, naps, and getting ready, offering a screen-free, ad-free experience.

**Highlights:** Visual time countdown, Customizable images, Calm routine aid, Offline functionality, No ads or tracking, Optional end-of-timer sound

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $0.99 | per 7 days |
| Monthly Subscription | $3.99 | per month |
| Full Unlock | $5.99 | one-time |


## Frequently asked questions

### Is Fluids & Particle Simulation free?

Fluids & Particle Simulation is free to download, with in-app purchases available.

### Is Gentle Timer free?

Gentle Timer is free to download, with in-app purchases available.

### Which has better reviews, Fluids & Particle Simulation or Gentle Timer?

Gentle Timer is rated higher. Fluids & Particle Simulation averages 4.7 out of 5 from 776 ratings, while Gentle Timer averages 5.0 from 1 ratings.

### Do Fluids & Particle Simulation or Gentle Timer have ads?

Neither Fluids & Particle Simulation nor Gentle Timer shows ads.

### Which is updated more often, Fluids & Particle Simulation or Gentle Timer?

Fluids & Particle Simulation ships an update monthly, and Gentle Timer monthly. Most recently, Fluids & Particle Simulation was updated on November 3, 2026 and Gentle 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.*