Chess Viewer by Everyman Chess is a comprehensive PGN viewer available for iPhone, iPod-Touch, and iPad. This free app allows you to read all text, multiple variations, and sub-variations of chess games. With Chess Viewer, you can easily play through all the games and have access to Everyman Chess's library of over 100 chess eBooks.

One of the standout features of Chess Viewer is its ability to provide easy access to any PGN file online or offline, from any source. Whether it's from your hard drive, a web page, email attachments, or via a URL, Chess Viewer makes it convenient to import and view PGN files. Additionally, when you download the app, you'll receive free eBook chapters as a bonus.

Chess Viewer also has an impressive capacity, as it can hold up to 3000 games. This allows you to build a vast collection of chess games and references right on your iPhone. Whether you're a chess enthusiast or a professional player, Chess Viewer is a must-have app for accessing and studying chess games on the go.