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Open source · runs in your browser

Prompt templates that behave like code.

Write a prompt once with typed fields and optional sections. PromptPal fills it in, checks it for the mistakes that quietly ruin answers, and exports a ready-to-run Claude API call.

Open the builder Browse templates
Template
Summarize this for {{audience}}.

<document>
{{document}}
</document>
{{#if focus}}
Prioritise anything about {{focus}}.
{{/if}}
Start with a one-line takeaway.
Output
Summarize this for the on-call engineer.

<document>
Postmortem: [insert timeline]…
</document>
Start with a one-line takeaway.

WarningThe prompt still contains “[insert timeline]”. The model will take it literally.

Features

  • A real template language

    Fields, {{#if}} sections and comments, parsed into a syntax tree. Mistakes are reported by line and column, and clicking one takes you there.

  • Checks before you paste

    Empty required fields, variables the template never uses, and leftover “[insert …]” text the model would take literally.

  • Straight to the API

    Copy plain text, or export a ready-to-run Messages API call as JSON, cURL, Python or TypeScript, with escaping that can’t break.

  • Private by construction

    There is no backend. Saved prompts stay in your browser; share links live in the URL fragment, which browsers never send to a server.

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