The service, often referred to as a "Netflix for books," launched on iOS last September. The new Android app works with both smartphones and tablets.
Oyster lets you choose from more than 500,000 books, with no limits on how many books you can read at a time. The app offers personalized recommendations based on the books you've chosen, and also supports offline reading.
Keep in mind, however, that Oyster's library is far from comprehensive, as HarperCollins and Simon & Schuster are the only major publishers who are participating. Hachette, Penguin Random House, and Macmillan don't make any of their books available through Oyster.
Oyster also isn't the only company in the subscription e-book business. Scribd has a similar model, offering more than 400,000 books for $9 per month. Another service called Entitle uses a membership club-type model, offering any two books to keep permanently for $10 per month. Amazon's Prime subscription service includes e-book rentals for Kindle devices, but the selection is small and users can only check out one book at a time.
If you want to give Oyster a try, the app offers a one-month free trial, but you do have to enter credit card information first, and beware: You'll get charged automatically if you don't cancel in time.