my11c vs CalcStak

The scientific calculator that defined an era — now in your pocket. my11C brings the legendary 11C Voyager series scientific calculator back to life with cycle-accurate emulation running the original microcode. Every keystroke, every display flicker, every RPN operation — faithfully reproduced. WHY ENGINEERS LOVED THE 11C The 11C wasn't just a calculator — it was the trusted companion of engineers, scientists, and students throughout the 1980s. Its blend of powerful scientific functions, full programmability, and the legendary efficiency of RPN made it a desk-and-pocket classic. Decades later, it remains a benchmark of how a calculator should feel. FEATURES - Cycle-accurate emulation — runs the original Voyager microcode, not a simulation - Full RPN entry — the efficient Reverse Polish Notation 4-level stack - Programmable — write, store, edit, and run programs just like the original (up to 203 lines) - Complete scientific function set — trigonometric and inverse trig in DEG, RAD, and GRAD - Logarithms and exponentials — LN, LOG, e^x, 10^x - Powers, roots, reciprocals, factorial, and percentages - Statistics — mean, standard deviation, and linear regression - Permutations and combinations - Random number generator - Rectangular to polar coordinate conversion - Hours-minutes-seconds conversions - Display formatting — FIX, SCI, and ENG notation - Conditional tests and flags for real programming - Authentic 7-segment LCD display with all original annunciators BUILT FOR TODAY - iCloud sync — your calculator state follows you across devices - Native on iPhone and Mac — landscape optimized on iOS, resizable window on macOS - Full keyboard support on Mac — type numbers and operators directly - Dark interface faithful to the original Voyager design - Built-in Owner's Manual for quick reference

A reverse-Polish-notation calculator built for the keyboard-first crowd: enter, op, done. No equals key, no parentheses, no nested expressions to babysit. WHY RPN If you've used an HP-12C, a Forth REPL, or any stack-based calculator, you already know: RPN is faster once your fingers know the moves. This app puts that experience on your phone without the skeuomorphic clutter. FEATURES • Stack display - see four levels at a glance, scroll deeper. • Full keyboard - numeric pad, operators, and stack manipulation (swap, drop, roll, LASTX). • Configurable angle mode (degrees / radians), stack mode (unlimited or HP-classic four-deep), and ENTER behavior. • Storage registers (STO/RCL 0–9) for holding values across calculations. • History - every operation, scrollable; tap a row to push that past result onto the stack. Capped at the most recent 150 entries. • Optional Scientific pack (one-time in-app purchase): trig + inverses, log/ln, 10^x/e^x, powers, roots, π and e. • Dark mode and a calm, monospace-forward design. • Offline-only. No tracking, no analytics, no network calls. Your math stays on your phone. NOT INCLUDED (BY DESIGN) • No "infix mode." This is RPN. If that's not what you wanted, this isn't your app. • No cloud sync. Yet. • No ads, ever. PRIVACY CalcStak collects nothing. The app does not make network requests. Settings and history are stored on-device.