Stax is a tool from Google Labs to solve LLM evaluation. Move beyond "vibe testing" by building custom autoraters to measure what matters to you. It's a full toolkit for testing your AI stack with your data, with support for all major model providers.
Stax is one of the few products I've seen recently that got me genuinely excited. It tackles a core problem for anyone building with LLMs: how to objectively evaluate output quality beyond just "vibe testing." We've already started using it with my internal dev team.
It solves two major headaches right away. First, it integrates with all the major model providers, so you're not stuck building your own testing harnesses. Second, the way you can batch test across custom use cases is incredibly convenient.
One of my team members responsible for QA summed it up perfectly, and I quote:
This is really cool! Actually I think this is what every vibe coding platform should embed
@sara_wiltberger How many active total projects does Alphabet have?
About Stax on Product Hunt
“Move your LLM evals from vibes to data”
Stax launched on Product Hunt on September 5th, 2025 and earned 182 upvotes and 4 comments, placing #5 on the daily leaderboard. Stax is a tool from Google Labs to solve LLM evaluation. Move beyond "vibe testing" by building custom autoraters to measure what matters to you. It's a full toolkit for testing your AI stack with your data, with support for all major model providers.
Stax was featured in A/B Testing (20.4k followers), Developer Tools (511k followers) and Artificial Intelligence (466.2k followers) on Product Hunt. Together, these topics include over 153.1k products, making this a competitive space to launch in.
Who hunted Stax?
Stax was hunted by Zac Zuo. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how Stax stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Zac Zuo
Hi everyone!
Stax is one of the few products I've seen recently that got me genuinely excited. It tackles a core problem for anyone building with LLMs: how to objectively evaluate output quality beyond just "vibe testing." We've already started using it with my internal dev team.
It solves two major headaches right away. First, it integrates with all the major model providers, so you're not stuck building your own testing harnesses. Second, the way you can batch test across custom use cases is incredibly convenient.
One of my team members responsible for QA summed it up perfectly, and I quote: