The best alternatives to Marvelous DB are Marvel (Comics) API, ComiXology, and Marvel Search. If these 3 options don't work for you, we've listed a few more alternatives below.
Read over 75,000 comics and over 700 free comics available from publishers such as Marvel, DC, Image, BOOM, IDW, Top Shelf, and Oni Press on your iPhone, iPad, Kindle Fire, Android, Windows, browser and more.
Visualize and compare comic book appearances per year for Marvel and DC characters. Characters on Comic Cruncher are copyright of Marvel or DC comics respectively (and as noted).