Looking up an IBAN is free, and always will be

On the website and in the browser extension, checking an IBAN and getting the bank behind it — name, BIC, address — costs nothing, needs no account, and has no limit. You never need a plan for that.

The plans below cover two separate things: bulk work in the extension (scanning a whole page and exporting it), and programmatic access through the API, which is metered per call.