# Atomic Letters vs Particle Simulation

The clearest difference is review sentiment: Atomic Letters at 100% against Particle Simulation's 25%. Atomic Letters also leads on rating (5.0 vs 4.5) and in-app purchases (none vs 4). Particle Simulation's advantage is update cadence (every 7 months vs every 61 months) and ratings volume (46 vs 2). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Particle Simulation sells 4 in-app purchases, starting at $3.99 per 7 days. Atomic Letters asks for nothing beyond the download.

Atomic Letters holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Particle Simulation has 46 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 100% of Atomic Letters's written reviews are positive against 25% of Particle Simulation's.

Atomic Letters ships an update every 61 months, Particle Simulation every 7 months. The most recent releases landed on October 9, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Atomic Letters | Particle Simulation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/atomic-letters/id925917614/reviews)** | [4.5 (46 ratings)](https://appshunter.io/ios/app/particle-simulation-flow-sim/id6467405758/reviews) |
| Number of ratings | 2 | **46** |
| Positive reviews | **100.0% of reviews** | 25.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 61 months | **Every 7 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 9 MB | 132 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Post River Software](https://appshunter.io/developer/325439356) | [Marvin Krueger](https://appshunter.io/developer/1152894281) |

## What reviewers say

### Atomic Letters

[App page](https://appshunter.io/ios/app/atomic-letters/id925917614)

Create unique visual representations of names and phrases using elements from the Periodic Table. Personalize your creations with custom fonts, colors, and backgrounds. The app generates high-quality PNG files perfect for various design projects.

**Highlights:** Spell names and phrases with Periodic Table elements, Customize fonts, colors, and backgrounds, Generate PNG files for various uses, Unique name spellings, Personalized design options

**In-app purchases:** none


### Particle Simulation

[App page](https://appshunter.io/ios/app/particle-simulation-flow-sim/id6467405758)

Explore a world of creativity and find tranquility with mesmerizing particle simulations. Interact with dynamic particles, customize their behavior, and create beautiful art impressions while listening to meditative music. It's a calming and creative outlet for stress reduction and self-expression.

**Highlights:** Dynamic particle simulation, Meditative music, Customizable parameters, Autopilot mode, Gyrosensor and haptic feedback, Capture and share creations, Save and load presets

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Particles PRO | $3.99 | per 7 days |
| Psychedelic magic \| monthly | $3.99 | per month |
| Particles PRO | $17.99 | per year |
| Psychedelic magic | $19.99 | one-time |


## Frequently asked questions

### Is Atomic Letters free?

Atomic Letters is free to download, with no in-app purchases.

### Is Particle Simulation free?

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

### Which has better reviews, Atomic Letters or Particle Simulation?

Atomic Letters is rated higher. Atomic Letters averages 5.0 out of 5 from 2 ratings, while Particle Simulation averages 4.5 from 46 ratings.

### Do Atomic Letters or Particle Simulation have ads?

Neither Atomic Letters nor Particle Simulation shows ads.

### Which is updated more often, Atomic Letters or Particle Simulation?

Atomic Letters ships an update every 61 months, and Particle Simulation every 7 months. Most recently, Atomic Letters was updated on October 9, 2026 and Particle Simulation on October 8, 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.*