Marvel Comics

In celebration of Comic-Con kicking off in San Diego, Marvel starting today is offering a special all-access pass to its digital library. Comic fans can now gain access to Marvel Unlimited for only $0.99. One-dollar will give you access to over 15,000 digital comics for one month. To take advantage of this deal, go to http://marvel.com/mu and use the promo code SDCC14 when purchasing a monthly subscription. The price will go to $9.99 after your first month is complete.

iOS users can use the free Marvel Unlimited app to read the digital comics on their iPad or iPhone. The service also works online with most browsers and on select Android devices. Users can save up to 12 comics on their device for offline reading. This means you're not getting 15,000 comics to keep for only $0.99, but you should be able to rip through big events such as the Age of Ultron, depending on how fast you read.

Marvel Entertainment is making some pretty big changes to its Marvel Unlimited app for iOS devices. The new version of the app will feature smoother panel transitions, adaptive audio and "DVD-style extras," according to CNET. Adaptive audio adds movie-like soundtracks and sound effects to Marvel's digital comics. The background score not only changes from panel to panel, but it also adapts to a reader's speed. Marvel is currently testing the new feature on its current Captain America: The Winter Soldier story arc.

Kristin Vincent, Marvel's vice president of digital products, said the smart audio feature will be added to more comics in the future, after they get enough feedback from fans.

"I think we have the best fans in the world, and the most vocal fans in the world. We're always watching the metrics," Vincent explained to CNET. "We look for what people are sharing in the social space. We're very in tune with our fans, or at least try to be, and move where they move."