# RPN Big Float Calculator vs eigenCalc

RPN Big Float Calculator and eigenCalc are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases 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.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on November 4, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | RPN Big Float Calculator | eigenCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rpn-big-float-calculator/id1312613680/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Monetization | Free | — |
| Size | 14 MB | 2 MB |
| Requires iOS | **14.1** | 15.5 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Stephan Jancar](https://appshunter.io/developer/1107422127) | [Luis Acevedo-Arreguin](https://appshunter.io/developer/1642773653) |

## What reviewers say

### 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


### eigenCalc

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RPN Big Float Calculator free?

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

### Is eigenCalc free?

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

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

Neither RPN Big Float Calculator nor eigenCalc shows ads.

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

RPN Big Float Calculator ships an update monthly, and eigenCalc monthly. Most recently, RPN Big Float Calculator was updated on November 4, 2026 and eigenCalc on November 8, 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.*