iBooks (v. 4.10)
- Athelas
- Charter
- Georgia
- Iowan
- Palatino
- San Francisco
- Seravek -- Sans Serif
- Times New Roman
Related: here's a deep dive into the system iBooks fonts (written in 2011, but still relevant). Here's another "review" of iBooks fonts (also from 2011).
Please note that as of 6/2017, you cannot embed fonts or have extra fonts show up as options in iBooks unless the publisher makes small modifications to the package.opf file. If that is done, the embedded font(s) show up as "Original" on the Font settings.
Kindle for IOS (ipad 1 through iphone 6s)
- Bookerly
- Caecilia
- Georgia
- Palatino
- Baskerville
- Helvetica (sans-serif)
- Lucida
- Droid Serif
- Open Dyslexic
- Publisher Font
iBooks 3.1.3 ipad 1/ios 5.1.1/
- Athelas
- Charter
- Georgia
- Iowan
- Palatino
- San Francisco
- Seravek -- Sans Serif
- Times New Roman
RELATED: Iosfonts.com shows system fonts for all Apple system devices (although not necessarily iBooks).