# phase estimation algorithm vs Quantum Bob

The clearest difference is update cadence: Quantum Bob at every 2 days against phase estimation algorithm's monthly. phase estimation algorithm's advantage is iOS requirement (16.0 vs 26.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

phase estimation algorithm ships an update monthly, Quantum Bob every 2 days. The most recent releases landed on October 3, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | phase estimation 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 | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | — | Free |
| Size | 12 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

### phase estimation algorithm

[App page](https://appshunter.io/ios/app/phase-estimation-algorithm/id6469448415)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 phase estimation algorithm free?

phase estimation algorithm is free to download, with no in-app purchases.

### Is Quantum Bob free?

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

### Do phase estimation algorithm or Quantum Bob have ads?

Neither phase estimation algorithm nor Quantum Bob shows ads.

### Which is updated more often, phase estimation algorithm or Quantum Bob?

phase estimation algorithm ships an update monthly, and Quantum Bob every 2 days. Most recently, phase estimation algorithm was updated on October 3, 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.*