# Shor's algorithm vs Quantum Bob

The clearest difference is in-app purchases: Quantum Bob at none against Shor's algorithm's 3. Quantum Bob also leads on update cadence (every 2 days vs every 6 months). Shor's algorithm's advantage is iOS requirement (16.0 vs 26.2). On price, ads and device support there is nothing between them.

Both are free to download. Shor's algorithm sells 3 one-off in-app purchases. Quantum Bob asks for nothing beyond the download.

Shor's algorithm ships an update every 6 months, Quantum Bob every 2 days. The most recent releases landed on September 28, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Shor's algorithm | Quantum Bob |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/quantum-bob/id6759178420/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 days** |
| Monetization | — | Free |
| Size | 7 MB | 13 MB |
| Requires iOS | **16.0** | 26.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sungjun Kim](https://appshunter.io/developer/1602461985) | [SquatchCraft LLC](https://appshunter.io/developer/1440325922) |

## What reviewers say

### Shor's algorithm

[App page](https://appshunter.io/ios/app/shors-algorithm/id6472044082)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| coffee | $0.99 | one-time |
| latte | $4.99 | one-time |
| whopper set | $9.99 | one-time |


### Quantum Bob

[App page](https://appshunter.io/ios/app/quantum-bob/id6759178420)

Engage with real quantum physics experiments by predicting measurement outcomes from actual quantum computer data. Compete against an AI leveraging quantum entanglement and discover the quantum advantage through interactive gameplay and lessons.

**Highlights:** Real quantum measurement data, Compete against quantum AI, Local multiplayer, Interactive lessons, Progress tracking, Statistical proof tests

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Shor's algorithm free?

Shor's algorithm is free to download, with in-app purchases available.

### Is Quantum Bob free?

Quantum Bob is free to download, with no in-app purchases.

### Do Shor's algorithm or Quantum Bob have ads?

Neither Shor's algorithm nor Quantum Bob shows ads.

### Which is updated more often, Shor's algorithm or Quantum Bob?

Shor's algorithm ships an update every 6 months, and Quantum Bob every 2 days. Most recently, Shor's algorithm was updated on September 28, 2026 and Quantum Bob on September 29, 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.*