# Developer Calc — Hex, binary and a paper ribbon

> Hex, binary and a paper ribbon (iPhone/iPad app by Laurent Grisel.)

- Source: https://appshunter.io/ios/app/developer-calc/id6812037761 (this page in markdown: same URL + `.md`)
- Developer: [Laurent Grisel](https://appshunter.io/developer/6773866627)
- Category: Productivity, Developer Tools
- Price: Free
- Age rating: 4+
- Requires: iOS 26.5 · 4 MB
- Languages: American English, French (France)
- Released: 2026-10-27
- Data updated: 2026-10-31

## What is Developer Calc?

Developer Calc is an iPhone and iPad calculator built for people who write code. It is optimized for iPhone Duo: closed, it looks just like it does on iPhone; open, the ribbon and the keypad share the large screen; partly folded, the split sits right on the hinge.

One keypad, four modes: calc for ordinary decimal arithmetic, and dec, hex and bin for 32-bit or 64-bit integers. Swipe the keypad left or right to move from one base to another: the current entry and the whole ribbon are converted instantly. Type a number in whichever base you like, and one swipe shows it in decimal, hexadecimal or binary without losing a single bit. Only the digits of the active base are offered: in binary the keypad shows nothing but 0 and 1.

Above the keypad sits a paper ribbon. Every operation is printed there with its result. Scroll back through it, tap any value to bring it back into the calculation, or long-press a result to copy it.

The display adapts to you: floating point or a fixed number of decimals, an adjustable number of decimals, and the number format of your region or one you choose.

• Four modes: calc, dec, hex, bin • Swipe the keypad to enter a number in any base and convert it, along with the whole ribbon • 32-bit or 64-bit modes, NOT and sign inversion • Scrolling paper ribbon, recall a value, copy a result • Floating or fixed decimals, adjustable number of decimals • Support for international number formats • Share the ribbon as text to Mail, Messages or Files • Automatic reset after a period you choose • Light, dark or system appearance • iPhone and iPad, portrait and landscape, with hardware keyboard support • Optimized for iPhone Duo, in every posture

Developer Calc collects no data. The app sends no information over the internet. No account, no ads, no tracking. Everything stays on your device.

## Is Developer Calc safe?

Not enough ratings yet to assess Developer Calc.

## Is Developer Calc legit?

Developer Calc appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Developer Calc is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-27

No release notes.

## More apps by Laurent Grisel

- [Podcast Sleep Aid](https://appshunter.io/ios/app/podcast-sleep-aid/id6773866624)
- [Paris Next Metro](https://appshunter.io/ios/app/paris-next-metro/id6809166036)

All apps by Laurent Grisel: https://appshunter.io/developer/6773866627

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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 2026-10-31.*