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KeyProbe
Validate LLM API keys & see model access — free forever
3 followers
Validate LLM API keys & see model access — free forever
3 followers
Ever wasted hours debugging why your LLM app isn't working — only to find your API key was invalid? LLM Key Tester solves this in seconds. Paste any key from OpenAI, Anthropic, Google, Mistral, Groq & more — instantly know: ✅ Is the key valid? ✅ Which models it has access to? ✅ How keys compare model-wise? 🔒 Key is NEVER stored or logged — ever. 🆓 No signup. No credit card. Lifetime free. ⚡ Results in under 3 seconds. Built for devs tired of guessing.
Hey Product Hunt! 👋
I built LLM Key Tester after one too many hours lost to a stupid root cause — an invalid API key.
You know the drill:
→ Your LLM app isn't working
→ You check your code, your prompts, your logic
→ 45 minutes later... it was just a bad key 🤦
So I built the tool I wish existed.
🔍 What it does:
• Validates keys from OpenAI, Anthropic, Google, Mistral, Groq & more
• Shows exactly which models each key has access to
• Lets you compare multiple keys side by side
• Returns results in under 3 seconds
🔒 What it never does:
• Never stores your key
• Never logs it
• Never sends it anywhere except the provider's own API
💡 Who it's for:
→ Devs switching between API keys across projects
→ Teams sharing keys who need to audit access
→ Anyone who's ever typed "why isn't this working" into Google at 2am
It's 100% free. No account. No credit card. Just paste and go.
Would love your feedback — what providers or features should I add next? Drop a comment below! 🙏
Would love to see support for checking remaining quota or credits on each key too. Super handy for anyone juggling multiple providers, nice work!
@mateuszjacni Thanks Mateusz
Awshar AI
As someone who builds side projects with 4-5 different LLM providers, I'm constantly juggling API keys and hitting random auth errors.
This is exactly the kind of micro-tool that looks simple but saves massive headaches.
No login. No email. Just paste your key → instant answer. That's how dev tools should work.
Gave it an upvote — hope this gets the attention it deserves! 👆 If you work with AI APIs at all, spend 10 seconds trying this.