With so many brands available these days and some of them not always following the Filofax size naming conventions, I often see questions like 'Is X the same as Y?' Or 'What size inserts fit an A size made by B?'
The table below is far from complete, the list just keeps expanding.
[Update] As with most things someone else has been here before down this path and I would like to thank Hans for sharing with us for all of his work put in to this very comprehensive page on his website. Check it out here: https://hjreggel.net/office/organizer_en.html

