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AI · April 20, 2026

CyberWriter – a .md editor built on Apple's (barely-used) on-device AI

Apple has quietly shipped a pretty complete on-device AI stack into macOS, with these features first getting API access in MacOS 26. There are multiple components in the foundation model, but the skills it shipped with actually make this ~3b parameter model useful. The API to hit the model is super easy, and no one is really wiring them together yet. - Foundation Models (macOS 26) - a ~3B-parameter LLM with an API. Streaming, structured output, tool use. No API key, no cloud call, no per-token cost. - NLContextualEmbedding (Natural Language framework, macOS 14+) -- a BERT-style 512-dim text…

CyberWriter – a .md editor built on Apple's (barely-used) on-device AI launched on April 20, 2026 with 15 votes, #1,070 of 21,248 launches that month and more than 90% of that year's launches.

Visit cyberwriter.app ↗Alternativestop 5% of April 2026

In plain words

CyberWriter is a Markdown editor for macOS that demonstrates Apple's on-device AI capabilities available through macOS 26 APIs. It combines a foundation model (a 3-billion-parameter LLM), text embeddings, and speech-to-text recognition to enhance writing. The editor runs entirely locally without cloud calls or per-token costs, designed for users working with Markdown who want AI assistance built directly into their system without external dependencies.

written from the facts on this page · September 2026

From the sources

A native macOS Markdown editor with live PDF preview, AI workspace, vault support, LaTeX, Mermaid diagrams, and zero external dependencies. Integrated Apple Intelligence and local and cloud API AI services, lifetime license. Knowledge graph, chat with your vault and embeddings built right into the app, no insecure community plugins needed, the app is fully sandboxes and available through the Apple App Store and direct sale through Lemon Squeezy, with a full feature free trial built in.

A native Markdown app for Mac, iPad and iPhone. Wikilinks, backlinks and a knowledge graph over your own folder of .md files, plus Mermaid diagrams, KaTeX math, Vega charts, PDF and Word export and your own AI model. Obsidian vault compatible. One purchase, no subscription, no account, no telemetry.

Charts that pull live data from a file in your vault or a URL on the web, and redraw when it changes. API blocks that run and render in the document. A full terminal that knows your vault. Your own system prompts, on a local model or a cloud one. A 3D knowledge map you can search by concept. Write in true WYSIWYG or split view, style it with your own CSS, and export a PDF with your fonts, your background and no pagination at all. All native, all in one signed app. Nothing to install alongside it. Write formatted text while the file on disk stays plain .md . One tap flips to raw source and back. Nothing is hidden from you, and nothing is locked in. Syntax coloured Markdown on the left, the…from cyberwriter.app

In the maker’s words, at launch

Apple has quietly shipped a pretty complete on-device AI stack into macOS, with these features first getting API access in MacOS 26. There are multiple components in the foundation model, but the skills it shipped with actually make this ~3b parameter model useful. The API to hit the model is super easy, and no one…

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