| 2P | 2M | 2F | SE | 1F2 | ||
| Native iPhone 6/6+ support | ✓ | ✓ | ✓ | |||
| Support both portrait and landscape orientations | ✓ | ✓ | ✓ | ✓ | ✓ | |
| READING BOOKS | 2P | 2M | 2F | SE | 1F2 | |
| Support multiple ebook formats3 | ✓ | ✓ | ✓ | ✓ | ✓ | |
| Reading progress for all supported formats | ✓ | ✓ | ✓ | EPUB only |
EPUB only |
|
| Sync book reading progress through AirDrop4 and email | ✓ | ✓ | ✓ | |||
| Support contextual menu (Copy / Define / Speak / Search5) | ✓ | ✓ | ✓ | |||
| Smart TXT to EPUB conversion | ✓ | ✓ | ✓ | limited | limited | |
| For EPUB | 2P | 2M | 2F | SE | 1F2 | |
| Customize various layout parameters6 | ✓ | ✓ | ✓ | ✓ | ✓ | |
| Day/Night mode and brightness control with vertical swipe gesture | ✓ | ✓ | ✓ | ✓ | ✓ | |
| More than a dozen built-in eye-pleasing day/night color themes | ✓ | ✓ | ✓ | |||
| Create your own color themes (background / text / heading / link colors) | ✓ | ✓ | ✓ | limited | limited | |
| Auto-reopen last book read | ✓ | ✓ | ✓ | ✓ | ✓ | |
| Fast full text search and automatically save recent searches | ✓ | ✓ | ✓ | ✓ | ✓ | |
| Unlimited number of bookmarks per book | ✓ | ✓ | ✓ | ✓ | ✓ | |
| "Comic" mode for image browsing | ✓ | ✓ | ✓ | ✓ | ||
| Unobtrusive reading progress indicator | ✓ | ✓ | ✓ | |||
| Fast and precise book navigation | ✓ | ✓ | ✓ | |||
| MANAGING BOOKS | 2P | 2M | 2F | SE | 1F2 | |
| Search books in Library by author or title | ✓ | ✓ | ✓ | ✓ | ✓ | |
| Group books by authors or tags hierarchically with multiple authors/tags per book | ✓ | ✓ | ✓ | limited7 | limited7 | |
| Group books by user-defined clusters | ✓ | ✓ | ✓ | |||
| Extract tags from EPUB | ✓ | ✓ | ✓ | |||
| Edit book title, author, and tags | ✓ | ✓ | limited7 | |||
| Choose book cover images from Album and Google | ✓ | ✓ | ||||
| GETTING BOOKS IN AND OUT | 2P | 2M | 2F | SE | 1F2 | |
| Convenient access to millions of free ebooks from multiple sources and add your own ebook sources (HTML websites and OPDS catalogs) | ✓ | ✓ | ✓ | ✓ | ✓ | |
| Import books via email | ✓ | ✓ | ✓ | ✓ | ✓ | |
| Send books to iBooks (with AirDrop4 support) | ✓ | ✓ | ✓ | ✓ | ✓ | |
| Send books by email | ✓ | ✓ | ✓ | ✓ | ||
| Import and export books through iTunes file sharing | ✓ | ✓ | ✓ | |||
| Extract tags from OPDS entry and automatically added to downloaded book | ✓ | ✓ | ✓ | |||
| Bonjour support and smart batch download from Calibre or OPDS LAN servers | ✓ | ✓ | ✓ | |||
| Built-in books for starters | ✓ | ✓ | ✓ | |||
| GETTING FONTS IN AND OUT | 2P | 2M | 2F | SE | 1F2 | |
| More built-in fonts available | ✓ | ✓ | ✓ | ✓ | ||
| Support unlimited number of TTF, TTC, OTF user font files | ✓ | ✓ | limited8 | |||
| Import and export user fonts through iTunes file sharing | ✓ | ✓ | limited8 | |||
| Add your own font sources (HTML websites and OPDS catalogs) | ✓ | ✓ | ||||
| Import fonts through AirDrop4, DropBox, Safari, and Mail | ✓ | ✓ | ||||
| MISC | 2P | 2M | 2F | SE | 1F2 | |
| Enhanced support for Chinese Books | ✓ | limited | ||||
| Ads Free | ✓ | ✓ | ✓ | |||
| Future updates | ✓ | ✓ | ✓ | |||
| Unlimited books | ✓ | ✓ | limited | ✓ | limited |
| 2P | 2M | 2F | SE | 1F2 | ||
| Support UPDB/PDB (haodoo.net variation) format | ✓ | ✓ | ✓ | ✓ | ✓ | |
| Smart UPDB/PDB to EPUB conversion | ✓ | ✓ | ✓ | limited | limited | |
| Haodoo.net catalog | ✓ | ✓ | ✓ | limited | ||
| Auto extract Haodoo.net book covers | ✓ | ✓ | ✓ | |||
| Vertical layout support | ✓ | ✓ | ||||
| Modern and classic vertical layout styles | ✓ | ✓ | ||||
| High quality conversion between Simplified & Traditional Chinese3 | ✓ | ✓ | ||||
| Built-in high quality Chinese fonts4 | ✓ | |||||
| Newly designed "seal-style" interface | ✓ | |||||
| Create Chinese books with mixed fonts with minimal editing | ✓ | |||||
| Independent layout parameters for Chinese books | ✓ | |||||
| Second generation Hanzi conversion engine3 | ✓ | |||||
| Enhanced classic vertical layout styles (modern and traditional styles) | ✓ | |||||
| Control interface automatically adapts to vertical or horizontal layout | ✓ |