# SigiCalc vs RPN Big Float Calculator

The clearest difference is update cadence: RPN Big Float Calculator at monthly against SigiCalc's every 48 months. RPN Big Float Calculator also leads on device support (4 vs 2) and iOS requirement (14.1 vs 17.0). On price, rating, review sentiment and ratings volume there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for SigiCalc against 5.0 for RPN Big Float Calculator. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews split almost evenly too, at 50% and 50% positive.

SigiCalc ships an update every 48 months, RPN Big Float Calculator monthly. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | SigiCalc | RPN Big Float Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/sigicalc/id522503444/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/rpn-big-float-calculator/id1312613680/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 50.0% of reviews | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 48 months | **Monthly** |
| Monetization | Free | Free |
| Size | 3 MB | 14 MB |
| Requires iOS | 17.0 | **14.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Siegware](https://appshunter.io/developer/443908611) | [Stephan Jancar](https://appshunter.io/developer/1107422127) |

## 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


### RPN Big Float Calculator

[App page](https://appshunter.io/ios/app/rpn-big-float-calculator/id1312613680)

This advanced calculator offers unparalleled precision for complex mathematical operations, supporting up to 100,000 digits. It features both RPN mode and direct formula input, with a vast array of functions and built-in constants. Explore calculations with complex numbers, quaternions, and p-adic numbers.

**Highlights:** High precision up to 100,000 digits, RPN and direct formula input modes, Complex number and quaternion calculations, Elliptic integrals and theta-functions, Built-in mathematical constants, P-adic number calculations

**In-app purchases:** none


## Frequently asked questions

### Is SigiCalc free?

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

### Is RPN Big Float Calculator free?

RPN Big Float Calculator is free to download, with no in-app purchases.

### Which has better reviews, SigiCalc or RPN Big Float Calculator?

SigiCalc and RPN Big Float Calculator are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do SigiCalc or RPN Big Float Calculator have ads?

Neither SigiCalc nor RPN Big Float Calculator shows ads.

### Which is updated more often, SigiCalc or RPN Big Float Calculator?

SigiCalc ships an update every 48 months, and RPN Big Float Calculator monthly. Most recently, SigiCalc was updated on November 1, 2026 and RPN Big Float Calculator on November 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.*