What's the CBI format that Comic Zeal Sync converts comics into?

What is it the CBI format?

The CBI format is an SQLite3 database containing the page images and the comic title.

Why not just use a zip file?

In the early days of the iPhone it's capabilities were very limited, the first generation had very little memory and processing power. At the time SQLite3 was the recommended way of storing and manipulating permanent data.

We still support the CBI format for compatibility but we now also support cbz/zip/cbr/rar on the iPad and soon on the iPhone.