Tools

Colour, subnet, counter and secrets stay in this browser. The pwned check sends only a five-character SHA-1 prefix to Have I Been Pwned; lookup talks to public RDAP servers and RIPE Stat. The editor can optionally save an encrypted workspace to the notes service.

• Subnet calculator

  IPv4 and IPv6 prefix arithmetic with a visual split/join plan and YAML/JSON export.

• Text counter

  Words, characters, sentences, bytes and reading time. Unicode-aware.

• Secret generator

  Uniformly random strings and EFF-wordlist passphrases, with honest entropy figures.

• Colour picker

  Named colours, a Coolors-style palette, and a system eyedropper.

• Editor

  A Notepad++-flavoured browser editor with tabs, split view, and Keep/Fetch.

• Pwned check

  Check a password against Have I Been Pwned without sending the password itself.

• Lookup

  RDAP for IPs, domains and ASNs, with a RIPE Stat WHOIS fallback.