# Primary Particle vs Atomic Fusion Rush

The clearest difference is in-app purchases: Primary Particle at none against Atomic Fusion Rush's 5. Primary Particle also leads on ads (none vs shown) and iOS requirement (12.0 vs 15.0). Atomic Fusion Rush's advantage is update cadence (every 5 days vs every 8 months). On price, rating, ratings volume and device support there is nothing between them.

Both are free to download. Atomic Fusion Rush sells 5 one-off in-app purchases. Primary Particle asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Primary Particle against 5.0 for Atomic Fusion Rush. Both are backed by a comparable volume of ratings — 3 and 5 respectively.

Primary Particle ships an update every 8 months, Atomic Fusion Rush every 5 days. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Primary Particle | Atomic Fusion Rush |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/primary-particle/id886683283/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/atomic-fusion-rush/id6771701538/reviews) |
| Number of ratings | 3 | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 8 months | **Every 5 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 47 MB | 61 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Stefan Schmitt](https://appshunter.io/developer/585665935) | [Erik Abrahamsson](https://appshunter.io/developer/1895826692) |

## What reviewers say

### Primary Particle

[App page](https://appshunter.io/ios/app/primary-particle/id886683283)

A fun puzzle game where players help a scientist stabilize particles in an experiment. Catch particles of the correct color to keep the experiment going and increase your score. Beware of tricky particles that appear as your skill level rises.

**Highlights:** Particle stabilization gameplay, Color-matching mechanic, Increasing difficulty, Score-based progression, Experiment simulation

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

**In-app purchases:** none


### Atomic Fusion Rush

[App page](https://appshunter.io/ios/app/atomic-fusion-rush/id6771701538)

Fuse atoms in a 2048-style puzzle game to discover elements and compounds. Progress through campaign levels, complete daily quests, and unlock power-ups. Become an alchemist and complete the periodic table.

**Highlights:** Fuse matching atoms, Discover compounds and molecules, 100 campaign levels, Daily quests and streak rewards, Unlockable power-ups, Collection tracking

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 5 coins | $0.99 | one-time |
| 20 coins | $2.99 | one-time |
| Pro Lab Pack - Lifetime | $4.99 | one-time |
| 50 coins | $5.99 | one-time |
| 100 coins | $9.99 | one-time |


## Frequently asked questions

### Is Primary Particle free?

Primary Particle is free to download, with no in-app purchases.

### Is Atomic Fusion Rush free?

Atomic Fusion Rush is free to download, with in-app purchases available.

### Which has better reviews, Primary Particle or Atomic Fusion Rush?

Primary Particle and Atomic Fusion Rush are both rated 5.0 out of 5 on the App Store, from 3 and 5 ratings respectively.

### Do Primary Particle or Atomic Fusion Rush have ads?

Atomic Fusion Rush shows ads; Primary Particle does not.

### Which is updated more often, Primary Particle or Atomic Fusion Rush?

Primary Particle ships an update every 8 months, and Atomic Fusion Rush every 5 days. Most recently, Primary Particle was updated on October 24, 2026 and Atomic Fusion Rush on October 16, 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.*