What is CyberWriter?
CyberWriter is a Markdown editor built on Apple's on-device AI stack — Foundation Models (macOS 26), NLContextualEmbedding, and SFSpeechRecognizer — so your notes never leave your machine. It indexes your entire Markdown vault locally using a BERT-style 512-dim embedder, then surfaces semantically related notes in search results even when the exact words don't match. Ask a question in the search bar and it retrieves the top five relevant chunks as context for a local RAG chat — no API key, no cloud call, no per-token cost. For writing, Command+Shift+A opens a full chat panel and Command+J triggers inline actions: rewrite, summarize, change tone, fix grammar, or continue. Apple Intelligence is the default model, but Claude, OpenAI, Ollama, and LM Studio all slot in if you prefer. Built specifically for users who handle sensitive content — health data, private research, confidential notes — and need AI assistance without handing files to a third-party service.
What is CyberWriter used for?
AI tool for writing assistant workflows
How much does CyberWriter cost?
Pricing not published
Pricing not published on the site. See cyberwriter.app for details.
Pros and cons
Pros
• Runs AI search, chat, and writing tools entirely on-device using Apple's built-in model stack • Indexes your Markdown vault locally and surfaces semantically related notes even without exact-word matches • Local RAG chat retrieves relevant chunks as context — no API key, cloud call, or per-token cost • Inline actions (rewrite, summarize, change tone, fix grammar, continue) via keyboard shortcuts • Optional swap to Claude, OpenAI, Ollama, or LM Studio if you prefer non-Apple models
Cons
• macOS-only and requires a recent OS (Foundation Models, macOS 26) for the default on-device model • On-device models may be less capable than the largest cloud models for complex tasks • Public pricing isn't listed on the site
Questions about CyberWriter
What is CyberWriter?
CyberWriter is a privacy-first Markdown editor for macOS that runs AI search, chat, and writing tools entirely on-device using Apple's built-in model stack, so your notes never leave your machine.
Does it send my notes to the cloud?
No. By default it uses Apple's on-device models for local RAG search and chat — no API key, no cloud call, and no per-token cost.
Can I use other AI models?
Yes. Apple Intelligence is the default, but Claude, OpenAI, Ollama, and LM Studio can all be slotted in if you prefer.
Who is it built for?
People who handle sensitive content — health data, private research, confidential notes — and want AI assistance without handing files to a third-party service.
What are the best alternatives to CyberWriter?
Compare this tool against close alternatives in the same category, focusing on output quality, onboarding speed, and workflow fit.
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