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Amazon’s Kindle e-readers are designed to do one thing really well: make it easier to read on the go. While the Kindle’s purpose is clear, it can be hard to choose the right model for you.

Amazon now offers four different Kindle varieties. The newly announced Kindle Oasis joins the Kindle, Kindle Paperwhite, and Kindle Voyage in Amazon’s lineup.

All of them offer the same software features, like Whispersync, which saves and syncs the last page you read, your bookmarks and annotations across all your devices, and Goodreads, which provides reading recommendations. The differences mostly come down to two factors: hardware and price.

Here’s a look at how Amazon’s Kindles compare, ranked from most expensive to least.

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