# my57 — Classic calculator emulator

> Classic calculator emulator (iPhone/iPad app by Miroslav Perovic.)

- Source: https://appshunter.io/ios/app/my57/id6805173745 (this page in markdown: same URL + `.md`)
- Developer: [Miroslav Perovic](https://appshunter.io/developer/400748424)
- Category: Utilities, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 26.5 · 4 MB
- Languages: American English
- Released: 2026-09-09
- Data updated: 2026-09-18
- User reviews in markdown: https://appshunter.io/ios/app/my57/id6805173745/reviews.md

## What is my57?

Relive the classic 1977 Programmable 57 pocket calculator — faithfully recreated for iPhone, iPad, and Mac.

my57 is a cycle-accurate emulator running the same ROM microcode as the original hardware. Every function, every keystroke, and every quirk — including its number formatting and error-blinking display — is reproduced exactly, not reimplemented.

AUTHENTIC HARDWARE
• 12-digit red LED display with a diffuser-glass texture and optional LED Glow
• Real Speed mode runs at the original ~5,000 cycles/second, or switch to Turbo for instant results
• Two documented factory ROM revisions (rev0/rev1) to choose from
• Algebraic Operating System (AOS) entry, exactly like the original

FULL PROGRAMMING SUPPORT
• 50 program steps with LRN (Learn) mode
• 8 addressable memory registers
• GTO, subroutines (SBR), conditional branches (x=t, x≥t), and Dsz counting loops
• Scientific notation, trigonometric functions, logarithms, and statistics (mean, variance, standard deviation)

BEYOND THE ORIGINAL
• Program & Memory panel — see every step's code and mnemonic, edit registers directly, insert/delete steps with undo
• Saved program library — save, rename, and organize your programs
• Share programs as .my57 files via Mail, Messages, AirDrop, or any app
• iCloud Sync keeps your programs, registers, and library current across every device

BUILT-IN USER'S GUIDE
A complete guide is right inside the app — covering the interface for newcomers, plus a full programming tutorial with worked examples (loops, subroutines, factorials, linear regression, and more) for anyone who wants to actually learn to program it.

DESIGNED FOR EVERY DEVICE
• iPhone: portrait, full-screen
• iPad: side-by-side program panel in landscape
• Mac: resizable window with full physical keyboard support

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full Version | $4.99 | one-time |



## Version history (last 1 release)

### 1.0.0 — 2026-09-09

No release notes.

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## More apps by Miroslav Perovic

- [my41CX](https://appshunter.io/ios/app/my41cx/id979041950)
- [my59](https://appshunter.io/ios/app/my59/id6759532452)
- [my16c](https://appshunter.io/ios/app/my16c/id6762121583)
- [my11c](https://appshunter.io/ios/app/my11c/id6762810891)
- [Hole in the Floor](https://appshunter.io/ios/app/hole-in-the-floor/id6767888842)
- [myPreferans](https://appshunter.io/ios/app/mypreferans/id6789721866)

All apps by Miroslav Perovic: https://appshunter.io/developer/400748424

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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 2026-09-18.*