portchecker.io

Self-hostable, open-source utility to check port status on a hostname or IP.

Webfree

portchecker.io is a free, open-source utility for checking whether a given port on a hostname or IP address is open, useful for troubleshooting network setups and validating firewall rules. It's built as a lightweight Litestar API behind a static front end, and can be self-hosted or used via its hosted API. It's aimed at developers and network admins who want a simple, low-overhead port-checking tool.

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Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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