Calcium Text Calculator vs Marko

Calcium is a text editor that updates math results as you type. Use `=>` to compute expressions. It supports all kinds of units. Best of all, it's free and open source!

Marko is a fast, native Markdown viewer for iPhone and iPad. Open any .md file and read it the way it was meant to look, with real typography, syntax-highlighted code, GFM tables and task lists, Mermaid diagrams, and KaTeX math. Everything renders on your device with no network access, so your documents never leave it. Marko is a viewer, not an editor. It never changes your files. Open Markdown straight from the Files app, or share it in from Mail, Safari, or any other app, and read it full-screen with an outline, find in page, and adjustable text size. It is built for the Markdown you didn't write by hand, too: the .md that AI assistants and coding agents produce, generated READMEs, and agent output. DOCUMENT INTELLIGENCE, ON DEVICE Summarize a long document, ask questions about it, or explain a selected passage, all processed on your device with Apple Intelligence. Nothing is sent to a server. (Requires a device with Apple Intelligence.) HIGHLIGHTS - Native Swift and SwiftUI app for iPhone and iPad. Not a web app. - Renders fully offline. Your documents never leave your device. - Opens Markdown in place from Files, and via the share sheet from other apps. - Outline, find in page, and text zoom. - Light, Dark, and System themes. - Universal purchase: buy once, use on Mac, iPhone, and iPad. Marko collects no data. It has no analytics, no accounts, and makes no network requests of its own. Free. Requires iOS or iPadOS 18 or later.