Chambers has become my go-to dictionary for everyday use, both online and in print. It seems to have more entries than American Heritage, Merriam-Websters Collegiate, or the Oxford American Dictionary, and its definitions are often simpler and almost always at least as precise. The app is easy to use, completely functional even with relatively old versions of iOS, and uncluttered by annoying pop-up ads and banners—and its free. Whats not to like? Highly recommended.
Prince Caspians Mouse about Chambers Dictionary, v3.2