Prompt testing should be simple and straightforward. All I wanted was a simple way to test prompts with variables and jinja2 templates across different models, ideally somthing I could open during a call, run few tests, and share results with my team. But every tool I tried hit me with a clunky UI, required login and API keys, or forced a lengthy setup process.
And that's not all.
Then came the pricing. The last quote I got for one of the tools on the market was $6,000/year for a team of 16 people in a use-it-or-loose-it way. For a tool we use maybe 2–3 times per sprint. That’s just ridiculous!
IMO, it should be something more like JSFiddle. A simple prompt playground that does not require you to signup, does not require API keys, and let's experiment instantly, i.e. you just enter a browser URL and start working. Like JSFiddle has. And mainly, something that costs me nothing if I'm or my team is not using it.
Eventually I gave up looking for solution and decided to build it by myself.
Here it is: https://langfa.st
Help me find what's wrong or missing or does not work from you perspctive.
P.S. I did not put any limits or restrictions yet, so test it wisely. Don't make me broke, please.
just one minor suggestion: It seems that the responses are not saved anywhere? even after signup, opening a new tab or just navigating within the app makes the responses disappear - if they're really not being stored, might be worth considering storing them. if they are, maybe the ux could make that more obvious (I couldn't find it). in any case, very useful project!