Interactive atlas / millimeters
Notebook size comparison
Choose two formats to compare their page footprint. A matching size does not automatically guarantee cover, ring, or refill compatibility.
A5 compared with Hobonichi Original
Choose two formats and select Compare.
How to read the result
Verified system means both entries belong to the same manufacturer-defined refill or cover family. Same footprint; system check required means width and height match but thickness, rings, tolerances, or closure design may differ. Not a verified direct fit means this atlas found no official compatibility statement.
The rectangles are scaled relative to each other, not to your screen. Always open the linked guide and current manufacturer specification before ordering.
Cover and refill decision path
Can this cover or refill be treated as a verified fit?
Answer from the current manufacturer or cover-maker specification. A marketplace title by itself is not evidence.