Show HN: Stackray – Detect any website's tech stack

Stackray, an open source tool for detecting website technology stacks, launched on Hacker News. The tool scans domains and URLs to identify frameworks, business tools, subdomains, and DNS records — positioning itself as an alternative to commercial services like BuiltWith that also incorporates open-source intelligence capabilities.

The platform offers both a public instance and the ability to deploy your own. Users can schedule recurring scans, set up alerts via email using Resend or through Slack, invite teammates, and generate API keys for programmatic access. The open source model allows developers to fork and customize the tool for their own infrastructure.

Stackray addresses a common need among developers and security researchers: gaining visibility into the technology stack of any website. Traditional tools in this space have typically been closed-source and commercial. By offering both a public web interface and a self-hostable option with team collaboration features, Stackray targets users ranging from individual developers doing competitive intelligence to security teams performing reconnaissance as part of their assessment workflows.

The OSINT integration — gathering DNS records, subdomains, and other publicly available infrastructure details alongside framework detection — expands the tool's utility beyond simple tech identification, making it useful for understanding the broader attack surface of a domain. The inclusion of Slack and email notifications means findings can feed directly into existing team workflows without manual checks.