Markdown editor built for the AI workflow era
Markdown Studio is a free editor designed for the AI workflow era — draft prompts, format context, and prep content for ChatGPT, Claude, and other LLMs. ✓ Real-time token counting across GPT-4, Claude & more ✓ Live preview that syncs with your cursor ✓ Auto-save version history every 5 minutes ✓ Smart copy optimized for AI chats ✓ Dark mode, multi-tab, PDF/HTML export 100% private. No accounts. No tracking. Your data never leaves your browser. Completely free.
Mermaid diagram editor with live preview supports flowcharts, sequence diagrams, ER diagrams, Gantt charts, and 8+ other diagram types. Diagrams render inline in markdown, export to PDF with full quality, and integrate seamlessly with GitHub markdown rendering.
Zero-knowledge architecture runs entirely client-side in the browser with no server-side processing. API keys are AES-256 encrypted locally, content never leaves the device, and analytics use privacy-focused Umami with no cookies or tracking pixels. Users maintain complete data sovereignty.
Battle Mode lets users run identical prompts across OpenAI, Claude, and Gemini in parallel, comparing outputs, token counts, and costs side-by-side in real-time. This eliminates manual switching between model interfaces and provides instant cost-benefit analysis for prompt optimization.
Markdown Studio provides 40+ slash commands, syntax highlighting for 180+ languages, GitHub integration for version control, and PDF export with preserved formatting. Users can write technical documentation in markdown, sync to GitHub repos, and export as professional PDFs without leaving the editor.
Real-time token counter supports GPT-4, Claude, Gemini, Llama, and 20+ other models with model-specific tokenizers. Users see instant token counts, context window usage percentages, and API cost estimates as they type, preventing truncation and unexpected charges.