CyberWriter

CyberWriter is a native Markdown editor for Mac, iPad and iPhone that works over a plain folder of .md files. Although the registry files it under image tools, its focus is writing and note taking, with AI as an optional layer rather than the core job. The editor offers true WYSIWYG writing or a split view with source and rendered result side by side, while the file on disk stays plain Markdown. Wikilinks and backlinks feed a knowledge graph that can be searched by concept as well as keyword, and the app is compatible with Obsidian vaults. Documents can render Mermaid diagrams, KaTeX math, Vega charts bound to a CSV file or a URL, and live API blocks. Other built in features include an offline Excalidraw canvas, snippets, on device voice note transcription, slides and spaced repetition flash cards, an integrated terminal, and export to PDF, Word and HTML without Pandoc or LaTeX. AI works through the user's own system prompts, on a local model or a cloud model of their choosing. It suits researchers, students, developers and writers who keep their notes as local files and want control over data. The vendor states that there is no account and no telemetry. The app costs $14.99 as a one time purchase on the Mac App Store, with a separate $14.99 universal purchase covering iPhone and iPad. There is no subscription, and a free trial, direct purchase and Setapp are also listed.