# Flow Doodle Free vs Particle Simulation Visualizer

The clearest difference is in-app purchases: Flow Doodle Free at none against Particle Simulation Visualizer's 2. Flow Doodle Free also leads on iOS requirement (7.0 vs 18.0). Particle Simulation Visualizer's advantage is update cadence (monthly vs every 52 months). On price, ads and device support there is nothing between them.

Both are free to download. Particle Simulation Visualizer sells 2 in-app purchases, starting at $3.99 per 7 days. Flow Doodle Free asks for nothing beyond the download.

Flow Doodle Free ships an update every 52 months, Particle Simulation Visualizer monthly. The most recent releases landed on October 5, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Flow Doodle Free | Particle Simulation Visualizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/flow-doodle-free/id543856587/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 37.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 52 months | **Monthly** |
| Monetization | Free | — |
| Size | 3 MB | 128 MB |
| Requires iOS | **7.0** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Y Lau](https://appshunter.io/developer/284938424) | [Marvin Krueger](https://appshunter.io/developer/1152894281) |

## What reviewers say

### Flow Doodle Free

[App page](https://appshunter.io/ios/app/flow-doodle-free/id543856587)

Create unique drawings with a "light flowing" fluid effect. Add vibrant colors and a special rainbow flow to your doodles. Save and share your animated creations easily.

**Highlights:** Fantastic animated "Light Flowing" fluid Effect, Different Doodle Colors, Special rainbow flow color, Save drawing to Photo Albums, Auto-hiding toolbar, Erase previous stroke

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

**In-app purchases:** none


### Particle Simulation Visualizer

[App page](https://appshunter.io/ios/app/particle-simulation-visualizer/id6765869491)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Particles PRO | $3.99 | per 7 days |
| Particles PRO | $24.99 | per year |


## Frequently asked questions

### Is Flow Doodle Free free?

Flow Doodle Free is free to download, with no in-app purchases.

### Is Particle Simulation Visualizer free?

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

### Do Flow Doodle Free or Particle Simulation Visualizer have ads?

Neither Flow Doodle Free nor Particle Simulation Visualizer shows ads.

### Which is updated more often, Flow Doodle Free or Particle Simulation Visualizer?

Flow Doodle Free ships an update every 52 months, and Particle Simulation Visualizer monthly. Most recently, Flow Doodle Free was updated on October 5, 2026 and Particle Simulation Visualizer on October 2, 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.*