This product was not featured by Product Hunt yet. It will not be visible on their landing page and won't be ranked (cannot win product of the day regardless of upvotes).
A GitHub App that checks OpenAPI 3.x JSON or YAML contracts on every pull request and posts a native GitHub Check. It catches removed endpoints, responses, required inputs, and incompatible schema changes before merge—without adding a workflow file. Founding Starter offer: £1 for the first month, then £19/month.
I built API Contract Guard after seeing API compatibility checks treated as a manual release task. Install the GitHub App, open a pull request that changes an OpenAPI file, and the result appears directly in GitHub Checks—no workflow file or sales call. There is a live proof pull request and a £1 first-month founding offer. I would especially value feedback from teams maintaining public or internal APIs.
Installed it on a side project yesterday and the PR check popped up within seconds, flagging a removed response field I would have shipped to prod. Native check integration is genuinely useful, no extra yaml in the repo is a nice touch.
Love that it runs as a native GitHub Check with no workflow file to maintain. Honestly that's the kind of detail that wins over backend teams who'd otherwise ignore yet another tool.
Installed it on a small Express repo and it caught a removed response field before I even refreshed the PR view. The native Check Run fits right into the review flow, no extra workflow noise.
One thing I'd love is a "breaking change severity" label on the GitHub Check, like minor vs major, so reviewers can triage PRs faster. Right now the check tells me something changed but not how much it might hurt downstream consumers.
Installed it on a side repo last night and was surprised the check actually flagged a renamed query param our team had missed for weeks. No workflow file is a nice touch.
About API Contract Guard on Product Hunt
“Block breaking OpenAPI changes before merge”
API Contract Guard was submitted on Product Hunt and earned 9 upvotes and 7 comments, placing #158 on the daily leaderboard. A GitHub App that checks OpenAPI 3.x JSON or YAML contracts on every pull request and posts a native GitHub Check. It catches removed endpoints, responses, required inputs, and incompatible schema changes before merge—without adding a workflow file. Founding Starter offer: £1 for the first month, then £19/month.
API Contract Guard was featured in API (98.4k followers), Developer Tools (516.2k followers) and GitHub (41.3k followers) on Product Hunt. Together, these topics include over 113.3k products, making this a competitive space to launch in.
Who hunted API Contract Guard?
API Contract Guard was hunted by Patrick Kenneally. 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.
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Patrick Kenneally