Free tools
Small checks you can use right now, in the browser. Each is a call to the same API that agents and developers use.
IBAN checker
Check whether an IBAN is valid: country length, format and the mod-97 checksum.
EU VAT number check
Check whether an EU VAT number is valid and active, and see the registered name and address where the member state publishes them.
LEI lookup
Look up a Legal Entity Identifier or search legal entities by name: legal name, registry number, legal form, addresses and the status of the LEI registration.
SPF and DMARC checker
Check a domain's e-mail authentication records: whether SPF and DMARC are present, their policies, and the domain's MX, NS, A and TXT records.
Company register lookup
Search official company registers by name, registry number, LEI or VAT number.
Norway company lookup
Look up a Norwegian company in the official register (Brønnøysundregistrene) by name or organisation number, with the answer in English: legal form, status, address, industry code and employee count.
Finland company lookup
Search the Finnish trade register (PRH, YTJ) by company name or business ID and get the legal form, status, address, industry code and registration date.
SIREN lookup
Look up a French company by name or SIREN number in the official SIRENE and RNE data: legal form code, status, address, NAF activity code, employee band and VAT number.
Czech company lookup
Look up a Czech company by name or IČO in the ARES register and get the legal name, address, status, registration date, NACE codes and VAT number in English.
Disposable email checker
Check an e-mail address without sending anything: syntax, mail servers, disposable or temporary-mail domain (over 9,000 listed), role addresses such as info@, and likely typos of popular providers.
ECB exchange rate lookup
Look up the euro foreign-exchange reference rates published by the European Central Bank for any date since 1999, converted to any base currency, with an optional amount.
EU tender search by CPV code
Search recent EU public procurement notices on TED by CPV code, buyer country and keyword, with the buyer, deadline, estimated value and a link to each notice.
URL to Markdown
Fetch a public web page and get its main text as Markdown with headings, lists, tables and absolute links: ready for an LLM prompt, a RAG index or notes.
Robots.txt and sitemap checker
Check a website's robots.txt and XML sitemaps in one run: blocked paths, sitemap files, URL counts, duplicates, off-host and non-HTTPS entries, missing lastmod and broken listed pages.
Domain expiry checker
See when a domain was registered, when it expires and how old it is, with status codes, nameservers, DNSSEC flag and registrar.
SSL certificate checker
Check a domain's SSL certificate: issuer, validity dates, days left, whether it is trusted, plus the domain registration and expiry dates.
DNS lookup
Look up the public DNS records of a domain in one go: address, mail, name server, text and alias records, with a summary of the e-mail authentication records.
Open Graph and link preview checker
See what a link preview reads from a page: title, description, canonical URL, Open Graph and Twitter card tags, favicon, language, feeds and structured-data types.
Sitemap checker
Audit a website's XML sitemaps and robots.txt in one run: whether each sitemap loads, URL counts, duplicates, off-host and non-HTTPS URLs, lastmod coverage and a list of concrete issues.
Website technology checker
Detect the technologies a public website uses: CMS or site builder, JavaScript framework, CDN and hosting, web server, analytics and tag managers, each with its evidence and a confidence level.
npm package vulnerability checker
Check an npm package version against a public vulnerability database: advisory ids, CVE and GHSA aliases, severity, the first fixed version and the latest release.
PyPI package vulnerability checker
Check a PyPI package version against a public vulnerability database: advisory ids, CVE and GHSA aliases, severity, the first fixed version and the latest release.
ENS lookup
Resolve an ENS name such as vitalik.eth to its Ethereum address, read from the ENS registry on Ethereum mainnet.
DOI lookup
Look up a DOI and get the paper's title, authors, journal, year, publisher, citation count and licence links.
README badge generator
Live SSL expiry, domain expiry and vulnerability badges for your README, with copy-paste Markdown.
One free check per tool and IP address per day. For more, use the API, MCP tools or Apify Actors.