IMO number checker
Paste one or more IMO numbers and see whether the check digit holds, with the arithmetic shown digit by digit.
Open the toolOpen tools
Tools that answer one question, without asking for anything
No account, no email address, no popup. Everything is calculated in your browser, and what you type never leaves your machine.
Deadline overview
Enter the certificates you hold and their expiry dates. Get them sorted, with days remaining, anniversary dates and a calendar file.
Open the toolCOLREG
COLREG rule by rule: plain-English explanations, examples, common mistakes and FAQ, with the official Norwegian text and links to the sources.
COLREG explained, rule by ruleCOLREG lab
Compare how different AI models solve the same collision-regulations scenario, scored against an answer key.
COLREG labSkipsvakt
Skipsvakt is launching soon – get early access
Skipsvakt is Justera's maritime product: vessel register, deadlines and regulation for vessels and fleets, with sources and what is missing. It is not on sale yet. Leave your email and you will get one email when it opens.