Free Version
updated at: July 2025
Test, refine, and share AI prompts instantly
Langfa.st is a fast, no-signup prompt engineering playground that helps teams design, test, and optimize AI prompts with full control and minimal friction. Our platform is built for prompt engineers, developers, and product teams working with large language models (LLMs) who need to rapidly iterate and validate prompt behavior before going to production.
Category: Organization & Automation
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Langfa.st's Pricing Plans
Langfa.st may change prices at any time. Here's our latest information:
Pro
One-time payment. No subscription
$60
- 50,000 extra requests included then $20 per 20,000 requests
- Full access to evaluations, workflows, and more coming soon
- Instant access to 50+ LLMs skip the setup — no API keys required
- Logs and history never expire
- Collaborate with your team members
- Ad-free
