Build prompts like Anthropic's own engineers
Labelled blocks in, clean XML out. Every prompt you save is a slash command in Claude Code, and it all runs on the plan you already have.
Updated 21 October 2026 · Version 0.2.5
The prompt builder
Role, Task, Context and Constraints as labelled blocks, turned into a clean XML prompt as you type.
Emphasis mode
Prompts the model can't misread. Every mention of a section becomes a pointer, so "follow the Role above" points at the Role, and your text stays as you wrote it.
Every prompt, a slash command
Save a prompt and type /mcp__promptuoso__review in Claude Code. Claude fills the blanks from your repo.
Your best prompts, on tap for every AI app
Claude Code, Cursor and Codex search, fill and improve your prompts over MCP. You approve each change.
A prompt coach that uses your AI, not ours
The Promptuoso Assistant improves prompts, finds duplicates and tidies folders, with before and after.
Pit models against each other
- Playground One prompt, several models side by side, with tokens and cost for each.
- Tokens and cost "About 1,240 tokens · $0.004 on Sonnet", before you send.
- Send to web AI One click from prompt to ChatGPT or Claude in the browser.
- Local models Ollama or LM Studio, offline.
A library that grows with you
Prompts, snippets, scripts and skills in one library, with Fill-ins, folders, tags, version history and 13 starter packs.
On Mac
Promptuoso is a local-first, cross-platform prompt manager for Windows, macOS, Android and iOS that keeps your prompts, snippets and scripts in one local library on your Mac with Fill-ins, folders, tags and version history, pastes any of them into any Mac app from an abbreviation, and lets Claude Code, Cursor and Codex use them over MCP. Compare Mac prompt managers.
Questions
Do I need an API key?
No. The builder, the assistant and the slash commands run on the Claude, ChatGPT or Gemini plan you already have. Only the Playground takes your own API key, if you want it.
Where do my prompts live?
In a folder on your PC. Sync through your own Drive if you want it.
Can my AI edit my library?
Only with your approval. Every change shows before and after, and can be undone.
Hire your AI team. It starts on launch day.
Pay once. 2 desktops and 2 phones, every update, the phone app included.