LangFast

FreeCode AssistantResearchProductivityDeveloper Tools

LangFast is an online LLM playground for rapid testing and evaluation of prompts, allowing users to compare responses across models and iterate on prompts.

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Our Verdict

AI is analyzing...

Who's Using It

personas.forDeveloperspersonas.forProfessionalspersonas.forResearchers🎓Student Friendly

Features

Prompt testing across multiple models

Side-by-side model comparisons

Jinja2 templates and variables

Save/share chat links

Support for OpenAI/GPT models

Use Cases

Testing and refining promptsComparing model responsesCollaborating on prompt development

Best For

DevelopersResearchersContent creators

Pricing

Free

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