# Rechenwerk: Hex & Binary Calc — Programmer calculator with RPN

> Programmer calculator with RPN (iPhone/iPad app by Mark Wirblich.)

- Source: https://appshunter.io/ios/app/rechenwerk-hex-and-binary-calc/id6817730363 (this page in markdown: same URL + `.md`)
- Developer: [Mark Wirblich](https://appshunter.io/developer/561040029)
- Category: Utilities, Developer Tools
- Price: $3.99
- Age rating: 4+
- Requires: iOS 16.4 · 40 MB
- Languages: American English
- Released: 2026-10-19
- Data updated: 2026-10-25

## What is Rechenwerk?

Rechenwerk is the programmer calculator we always wanted in our pocket. Mix number systems in one expression, work in RPN like the HP-16C, and see every bit of your result.

HEX, BINARY AND DECIMAL. IN ONE LINE.
Write numbers the way an assembler reads them: $FF or 0xFF for hex, %1010 or 0b1010 for binary, @17 for octal, #42 for decimal — and mix them freely:
%10001 + $123 + 32 + $A3 = 503
A number without a prefix is read in the base you selected.

RPN LIKE THE HP-16C
• Stack lift, ENTER, x↔y, R↓, CHS — or switch to algebraic entry: 3 + 3 =, like any calculator, with a live result
• An unlimited stack that scrolls above X, or the classic four levels
• Tap a level to use it again, swipe it into X or away
• 16 registers with STO and RCL

EVERY BIT IN VIEW
• Word sizes from 1 to 64 bits; unsigned, 1's or 2's complement
• The value in HEX, DEC, OCT, BIN and as characters ('ILBM')
• A bit grid: tap a bit to flip it
• Drag across bits to read a field — its value and its mask, perfect for hardware registers
• Carry and overflow flags, rotate through carry, count bits, set / clear / test bits
• Float mode shows the IEEE-754 bits of a double

MADE FOR DAILY WORK
• Hold any number to copy it — hex and binary keep their prefix
• Paste into the display when the clipboard holds a number
• Undo and redo every step, even an accidental AC
• A tape of every calculation
• bswap, wswap, clz, ctz, bitrev, maskl / maskr and more in algebraic mode
• Portrait and landscape — and on iPad any window size: the calculator scales to fill it, and where there is room, every function gets a key of its own
• With a keyboard on iPad or Mac: type digits, operators and prefixes, Return for ENTER, ⌘Z to undo

PRIVATE BY DESIGN
No account, no ads, no tracking. Rechenwerk works offline; nothing you calculate leaves your device.

## Is Rechenwerk safe?

Not enough ratings yet to assess Rechenwerk.

## Is Rechenwerk legit?

Rechenwerk: Hex & Binary Calc appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Rechenwerk is 68 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.0.1 — 2026-10-21

On iPad, and in larger windows on a Mac, every function now has a key of its own, without f — wherever there is room for it.

If Rechenwerk has been useful to you for a while, it now asks once whether you’d like to rate it — never while you’re typing. Ratings help other programmers find the app.

### 1.0.0 — 2026-10-19

No release notes.

## More apps by Mark Wirblich

- [Catpad](https://appshunter.io/ios/app/catpad/id572419370)

All apps by Mark Wirblich: https://appshunter.io/developer/561040029

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-25.*