# Criticality Idle - Reactor Sim — Realistic Nuclear Reactor

> Realistic Nuclear Reactor (iPhone/iPad app by Quantum Fuzz.)

- Source: https://appshunter.io/ios/app/criticality-idle-reactor-sim/id6794480172 (this page in markdown: same URL + `.md`)
- Developer: [Quantum Fuzz](https://appshunter.io/developer/6794480174)
- Category: Games, Education, Simulation
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 250 MB
- Languages: American English
- Released: 2026-08-11
- Data updated: 2026-10-10

## What is Criticality Idle?

Inspired by real simulation tools used by nuclear engineers, Criticality Idle simulates nuclear reactor physics in a fun way that anyone can understand.

Work your way through various reactor layouts, from realistic to silly, and everything in between.

Reactor components include fuel, control rods, water, graphite, reflectors, and neutrons, all of which have multiple upgrades to increase power and income.

Simulator particle limit can be adjusted based on your device capabilities while still maintaining accurate power and income levels.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Zirconium Nugget | $0.99 | one-time |
| Zirconium Ingot | $4.99 | one-time |
| Zirconium Slab | $9.99 | one-time |
| 2x Income and No Ads | $7.99 | one-time |
| 2x Offline Efficiency | $4.99 | one-time |
| Essential Bundle | $4.99 | one-time |
| Night Shift | $1.99 | one-time |


## Is Criticality Idle safe?

Not enough ratings yet to assess Criticality Idle.

## Is Criticality Idle legit?

Criticality Idle - Reactor Sim has limited verification signals. The AppsHunter Legitimacy Score for Criticality Idle is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.1 — 2026-08-15

New marketing URL. No code changes.

### 1.0 — 2026-08-11

No release notes.

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## Related topics

[nuclear simulator](https://appshunter.io/ios/topics/nuclear-simulator) · [graco reactor](https://appshunter.io/ios/topics/graco-reactor) · [nuclear reactor simulator](https://appshunter.io/ios/topics/nuclear-reactor-simulator)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-10.*