# SigiCalc vs eigenCalc

The clearest difference is update cadence: eigenCalc at monthly against SigiCalc's every 48 months. eigenCalc also leads on iOS requirement (15.5 vs 17.0). 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.

SigiCalc ships an update every 48 months, eigenCalc monthly. Both last shipped on October 4, 2026.

## The numbers

| Metric | SigiCalc | eigenCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sigicalc/id522503444/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 48 months | **Monthly** |
| Monetization | Free | — |
| Size | 3 MB | 2 MB |
| Requires iOS | 17.0 | **15.5** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Siegware](https://appshunter.io/developer/443908611) | [Luis Acevedo-Arreguin](https://appshunter.io/developer/1642773653) |

## What reviewers say

### SigiCalc

[App page](https://appshunter.io/ios/app/sigicalc/id522503444)

This app provides a graphical RPN calculator with an undo feature. Users can input mathematical equations and instantly visualize them with a plot. It's designed for simplicity and practicality in mathematical calculations.

**Highlights:** Graphical RPN calculator, Equation plotting, Undo functionality, Simple interface, Practical calculations

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

**In-app purchases:** none


### eigenCalc

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SigiCalc free?

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

### Is eigenCalc free?

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

### Do SigiCalc or eigenCalc have ads?

Neither SigiCalc nor eigenCalc shows ads.

### Which is updated more often, SigiCalc or eigenCalc?

SigiCalc ships an update every 48 months, and eigenCalc monthly. Most recently, SigiCalc was updated on October 4, 2026 and eigenCalc on October 4, 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.*