How this site is organised
Five groups, chosen by what you are holding rather than by technology. Social account tools take a list of handles or UIDs and tell you which ones still resolve, then read the public fields behind them. Email tools answer whether an address is real and why a message did not arrive. Network tools look at DNS, ports, headers and certificates from outside your own network, which is the view that matters when a colleague can reach something and you cannot. Developer tools transform text in the page, so an API response with real records never gets uploaded anywhere. Security tools generate and inspect secrets using the browser's own cryptography. Most of it is free outright. A small number of the account lookups are metered by the hour, and when that allowance runs out the page says so rather than returning empty rows that look like a result.
FAQ
Do I need an account to use anything here?
No. Every tool works on the page you land on. There is no signup wall, no email capture, and no trial that expires.
Which tools send my input to a server?
Account checks, DNS and port lookups, header and certificate reads, and the email address check all have to reach the internet, so they run on our server. JSON, URL encoding, timestamps, user agents, cookies, list cleaning, tables, notes, passwords, hashes and 2FA codes run in your browser and stay there.
What does metered mean, and which tools are metered?
A small number of the account lookups run jobs upstream and carry an hourly free allowance: Instagram region, profile, followers, following, post and story archives, plus the Facebook friend count and username resolution. When the allowance is spent you get a notice rather than a silently empty table.
Can any of these see private accounts or private mail?
No. Everything reads what a logged out visitor can already see. The one exception is the Outlook reader, which needs a token you already hold for a mailbox you are entitled to read.
Are the results authoritative?
They describe one request at one moment. Platforms rate limit anonymous traffic, DNS is cached at every hop, and public fields change without notice. Re-run anything before you act on it, and treat a single failed check as a question rather than an answer.