When comparing Astonishing Comic Reader vs Perfect Viewer, the Slant community recommends Perfect Viewer for most people. In the question“What are the best comic book readers for Android?” Perfect Viewer is ranked 4th while Astonishing Comic Reader is ranked 7th. The most important reason people chose Perfect Viewer is:
It doesn't add the "right" color (it uses an algorithm to replace 4 shades of grey with 4 earth-tones), but it makes B&W comics a little more interesting.
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Pros
Pro Helps organize large libraries of comics
It allows grouping comics together, adding tags and favouriting.
Pro Offers multiple navigation methods
Allows swiping, using on-screen navigation buttons or volume rocker to switch pages.
Pro Chromecast support
Pro Can import comics from Dropbox
Pro Great interface
Pro Tracks how far a comic has been read
Pro False Color feature can add color to otherwise B&W manga
It doesn't add the "right" color (it uses an algorithm to replace 4 shades of grey with 4 earth-tones), but it makes B&W comics a little more interesting.