# eigenCalc vs quantum error correction 2

eigenCalc and quantum error correction 2 are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | eigenCalc | quantum error correction 2 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | — |
| Size | 2 MB | 6 MB |
| Requires iOS | **15.5** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Luis Acevedo-Arreguin](https://appshunter.io/developer/1642773653) | [Sungjun Kim](https://appshunter.io/developer/1602461985) |

## What reviewers say

### eigenCalc

[App page](https://appshunter.io/ios/app/eigencalc/id6503222785)

**Features:** macOS Compatibility

**In-app purchases:** none


### quantum error correction 2

[App page](https://appshunter.io/ios/app/quantum-error-correction-2/id6505033728)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is eigenCalc free?

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

### Is quantum error correction 2 free?

quantum error correction 2 is free to download, with no in-app purchases.

### Do eigenCalc or quantum error correction 2 have ads?

Neither eigenCalc nor quantum error correction 2 shows ads.

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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.*