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I made a JSFiddle for testing AI prompts — no signup, no API keys, supports 50+ models, jinja2 templates and variables
I built this out of frustration while leading the development of AI features at Yola.com.Prompt testing should be simple and straightforward. All I wanted was a simple way to test prompts with variables across different models, ideally something I could open during a call, run a few tests, and share with the team. But every tool I tried hit me with a clunky UI, required login and API keys, or forced a lengthy setup process.
Then came the pricing. The last quote I got for some of the tools on the market was $6,000/year for a team of 4 in a use-it-or-loose-it way. For a tool we use maybe 2–3 times per sprint. That’s just ridiculous!
All I was looking for is something more of the JSFiddle type of experience – a fast, no-signup, no-API-key prompt playground with popular models, support of jinja2 templates and variables, that works out of the box. And mainly, something that costs me nothing if I'm or my team is not using it. Eventually, I ended up building this by myself.
Would love your feedback: https://langfa.st
P.S. Not trying to replace your whole AI ops stack — just want to solve a few things really well: prompt management, testing, and sharing.