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Langfa.st
Test, refine, and share AI prompts instantly — no signup required
Langfa.st is a lightweight and flexible prompt testing platform built to accelerate AI feature development. Created by a team with experience scaling AI-powered SaaS products to over 15M users, it eliminates friction in prompt engineering by offering instant access, dynamic Jinja2-based templating, and raw LLM output without API abstractions.
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