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Dead Link Checker is an online tool that crawls a website to identify broken links. Free manual checking covers single and multiple sites, while subscription packages provide automated link checking. Multi Check runs checks across multiple websites in one go and emails the report; Auto Check runs checks regularly and emails reports automatically. The tool highlights broken link building opportunities and requires no downloads.
Cybernews checker for seeing whether an email or phone appears in known data leaks.
A tool for checking whether an email address appears in the Ashley Madison breach data. The site states about 36 million accounts were compromised, including some duplicate email addresses, and advises changing passwords. It also notes that Ashley Madison did not validate account email addresses.
Proofy is an email verification service that checks email addresses before sending. It flags invalid, disposable, catch-all, role-based, and risky addresses to reduce bounces. Verification is offered through bulk list uploads, a REST API, and a free single-address checker.
linkok.com is a broken link checker that scans a website periodically and emails a report summary with a link to the full report. It retries after temporary errors to reduce false positives. A free plan covers a website with up to 100 pages on monthly scans.
Fast, asynchronous link checker written in Rust. It finds broken hyperlinks and email addresses and natively supports Markdown and HTML files. It is distributed as a single static binary and can output structured JSON for integration into CI/CD pipelines.
Have I Been Pwned is a data breach search and notification service. It lets users check whether an email address appears in known data breaches and lists instances where data was found in paste records. It also offers an MCP server that connects AI agents to breach, password, paste, domain and stealer log data.
Python OSINT tool that checks whether an email address is registered on many sites without sending mail.
Mozilla service that checks email addresses against known breaches and explains protective steps.
Breach exposure lookup service for checking whether an email appears in known breach datasets.
Design.dev offers free generators for AI coding agent configuration files, copy-paste UI templates, and front-end tools for directing AI agents and verifying their output. It includes browser feature detection, a color contrast checker, an image optimizer, and email newsletters.
A change detection and notification service that monitors web pages and sends an email when a favourite page has changed. The site notes that some sites may block the service from monitoring them.
OSINT search platform for finding emails, domains, files, leaks, and public records across sources.
IntoDNS.AI is a DNS and mail server checker that reports on SPF, DKIM, DMARC, DNSSEC, MTA-STS, BIMI, FCrDNS and blacklists. It also offers a free public REST API for DNS and email security scans, with JSON and Markdown reports. The service states it is not affiliated with intodns.com.
Lychee is a fast, asynchronous, stream-based link checker written in Rust. It scans content including Markdown, HTML, reStructuredText, websites and other formats to identify broken URLs and invalid email addresses. The project is hosted as a public repository on GitHub, with documentation covering development, installation and supported platforms.
