This is my opinion about my experience with four different reader apps in ios,:
- customization. For me is the most important feature,one of the reasons I prefer ios to an eink reader, the possibility to add url schemes,search your own dictionary, etc
Marvin and Kybook 2 are great
Mapleread and Hyphen dont have the possibility to add url Schemes
- Database
Marvin , Mapleread and Hyphen has very nice databases , Marvin has a random order that I like a lot.
Kybook must improve
- interface
Here Mapleread and Hyphen are the best
Kybook and Marvin are ok.
- page count
Hyphen seems the best, in Marvin you can customize the page information you want, Kybook is good too, Mapleread only gives pages in chapter
- pdf
here Mapleread se and kybook 2 are the winners
My conclusions
Marvin is the best , but lacks pdf support and has some minor issues
Mapleread and Hyphen are magnificent apps but lacking the possibility to use reader own dictionary , or app
Kybook 2 is a great app, but his database is not very good
I expect these apps would improve to give the readers all they want!