Calculator
A real expression parser with a scientific mode and full keyboard control.


01What it does
Calculator
in plain words.
included in
Free, and every plan above it
Every built-in app is fully functional on the Free plan. See pricing.
Calculator is a macOS inspired calculator with a real expression parser behind it, not a state machine that only understands one operation at a time, plus a scientific mode for trig, logarithms and constants.
History persists between sessions, every function works from the keyboard, and both a light and a dark theme are tuned to match the rest of the desktop.
02Features
- A genuine expression parser, not button chaining
- Scientific mode for trig, logs and constants
- Persisted calculation history
- Full keyboard control
- Matching light and dark themes
04Related
05Also from the community
See all community toolsBuilt by people outside the core team, installable from the App Store.
- chess.app

Chess
A complete chess app for NextOS with its own engine, opening book and game analysis - every rule, eight strengths, PGN files.
- recall.app

Recall
Spaced-repetition flashcards whose decks are plain Markdown files you can edit anywhere, with an Anki-style scheduler and tools an agent can call.
- sketch.app

Sketch
An infinite whiteboard for NextOS: shapes, arrows that stay attached when you move things, freehand, sticky notes, frames, and clean SVG export.