RPN Big Float Calculator vs eigenCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RPN Big Float Calculator
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.
- 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
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Perhaps the most accurate calculator on the iPhone. Precision from 16-bit up to 100.000. Fast Calculation in RPN-Mode or direct formula input. Lots of functions up to elliptic integrals, theta-functions, gamma and log gamma. Built in constants for gamma, pi, Feigenbaum. Calculation mode for complex numbers, quaternions, integers and p-adic numbers. Nerdy functions with Klingon user-Interface.
eigenCalc
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Matrix Calculator that computes eigenvalues and eigenvectors as well as SVD, and that has been tested with 228x228 matrices.
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Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | RPN Big Float Calculator | eigenCalc |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Monthly | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 14.1 — better | 15.5 |
| Further details — not scored | ||
| Size | 14 MB | 2 MB |
| Age rating | 4+ | 17+ |
| Developer | Stephan Jancar | Luis Acevedo-Arreguin |
In-app purchases
RPN Big Float Calculator
No in-app purchases
eigenCalc
No in-app purchases
Questions
Is RPN Big Float Calculator free?
Is eigenCalc free?
Do RPN Big Float Calculator or eigenCalc have ads?
Which is updated more often, RPN Big Float Calculator or eigenCalc?
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