From prompt engineering to documentation, all in one tool
Click "Run Battle" to compare models
Click "Run Battle" to compare models
No signup required. Works offline.
Every feature designed to make working with AI models faster and easier.
Type < for instant access to 23 AI prompt tags. Smart autocomplete with thinking, instructions, examples, and Claude 4 control tags.
Know exactly how many tokens your prompt uses. Works with GPT-4, Claude, Gemini context limits.
Code review, documentation, bug analysis, and more. 24 battle-tested templates for AI and general workflows.
Run prompts across OpenAI, Claude, and Gemini in parallel. Compare outputs, tokens, and cost side-by-side.
Create reusable templates with {{variables}}. Save presets and swap values instantly across prompts.
Copy as Markdown, Plain Text, with Metadata, or optimized for AI. One click, perfect formatting.
Catch frontmatter config errors before execution with real-time validation and auto-fix suggestions.
Everything you expect from a modern markdown editor, and more.
The professional workflow. Sync to GitHub repos and gists. Conflict detection, versioning, and encrypted tokens.
Write on the left, see rendered output on the right. Click any line to highlight it in preview.
Type / to insert tables, code blocks, templates, diagrams. Keyboard-first workflow.
Work on 10 files at once. Each tab preserves undo history and auto-saves independently.
Download as PDF, HTML, JSON, or Markdown. Your content, your format, your choice.
Follows your system preference automatically. Easy on your eyes, day or night.
Create flowcharts, sequence diagrams, and more with simple text syntax.
Write equations with $E=mc²$ syntax. Powered by KaTeX for fast rendering.
Turn any markdown into a slideshow. Navigate with arrow keys, swipe on mobile, or go fullscreen.
Deterministic execution, audit logging, and compliance tools for production prompt workflows.
Lock prompts for reproducible outputs. Temperature=0, seed-based consistency, exact model version pinning.
Comprehensive execution history with severity levels, content redaction, and SIEM webhook integration.
Automatic detection of SSN, credit cards, emails, and phone numbers. Client-side compliance scanning.
SHA-256 hashing, drift detection, and validation. Certify prompt executions for governance and compliance.
Everything runs on your device. We never see your content.
Rendering, token counting, exports, and LLM calls all run on your device. API calls go directly from your browser to the provider — we are never in the path.
We use Umami (cookieless) to understand which features you love—never what you write.
No account exists because none is needed. No email, no password, no profile — zero identity surface.
No signup required. Works offline.
Specialized tools for markdown and AI workflows
Count tokens for GPT-4, Claude, and Gemini. Real-time counting with model-specific tokenizers.
Battle-tested prompt templates for code review, testing, documentation, and more.
Create flowcharts, sequence diagrams, and visualizations with live preview.
Complete reference for markdown syntax, formatting, and best practices.
Deep dive into LLM parameters: temperature, max tokens, top-p, seed, and deterministic execution.
Convert markdown to beautifully formatted PDF documents.
Transform markdown into clean, semantic HTML.