Amazon Prime is best known for two things: free two-day shipping and Netflix-style video streaming. Those are decidedly worthwhile perks, especially considering the relatively low $99 annual subscription charge, but a Prime membership affords more than just shipping and streaming. A lot more.

Here's a look at every single benefit included with Prime -- along with a few Amazon services you might think were included, but actually cost extra.

The complete list of Prime perks is surprisingly long, starting with everyone's favorite:

1. Free two-day shipping (or better)

Many, if not most, of Amazon's physical goods will be shipped to your door in two days -- provided you live in the contiguous US states (sorry, Hawaiians). What's especially remarkable about this is there's no minimum order: Even if you buy a $5 HDMI cable, it'll arrive in 48 hours. In fact, residents of some ZIP codes can enjoy same-day delivery at no extra charge, so as long as the order totals at least $35.

Not in a rush? Very often you can opt to forgo two-day delivery in exchange for credit that can be applied to digital purchases (ebooks, movie rentals, etc.). Look for this option on the checkout page where you select your shipping option.

2. Free release-date delivery

Suppose you preorder a new book from your favorite author or a hot new tech product. As a Prime subscriber, you'll receive that item on the exact day it's released -- not two days later. Only certain items are eligible, of course.

3. Free two-hour delivery

Prime Now takes things hyperlocal, delivering groceries, restaurant food and other items in just two hours -- or within one hour for an extra $7.99. As of this writing, however, Prime Now is available in just a handful of cities.

4. Free (or flat-rate) grocery and household item delivery

Toilet paper, dog food, shampoo, your favorite cereal -- Prime Pantry will deliver these and other goods (pretty much anything that doesn't require refrigeration) for free. However, you need to order a minimum of five "qualifying" items, otherwise there's a flat $5.99 delivery charge.

5. Alexa deals

Do you own an Alexa-compatible device? That could be anything from an Amazon Echo to a Dash Wand to a Fire tablet or TV. If so, utter these magic words: "Alexa, what are your deals?" She'll rattle off a list of rather random Prime-exclusive deals, pausing after each one to ask if you want to buy it. It's certainly not the most efficient way of shopping -- especially if you opt to hop online to make sure the deal you're getting is actually a good one -- but it's a Prime perk all the same.

6. Restaurant delivery

Amazon is currently test-driving restaurant delivery, with the promise of easy ordering, real-time delivery tracking and no menu markups. It's offered in 30 US cities and 20 more worldwide; use your ZIP code to see if it's available in your area. If it is, Prime subscribers get free delivery within two hours of ordering.

7. Whole Foods benefits

Following Amazon's acquisition of the grocery chain, you can now score exclusive perks and discounts.

For starters, residents of Austin, Texas;  Virginia Beach, Virginia; Cincinnati and Dallas can now get free two-hour delivery from Whole Foods stores -- though that requires a Prime Now membership. Amazon and Whole Foods plan to add more cities throughout 2018.

If you have an Amazon Prime credit card, you can now get 5 percent back on all Whole Foods purchases.

Even without that card or a Prime Now membership, Amazon Prime subscribers can get "special savings and in-store benefits," though Amazon has yet to announce any specifics on that front.

8. Unlimited video streaming

Prime Video is akin to Netflix, offering movies, TV shows and original content. It's accessible on virtually all mobile devices and most streaming sticks and boxes (the notable exception being Apple TV). However, Prime has one huge ace up its sleeve: many TV shows, and some movies, can be downloaded to your phone or tablet for offline viewing.

9. Limited music streaming

Amazon Prime Music affords unlimited, ad-free access to a song library stocked with over 2 million tracks. You can stream them to various devices, but songs can also be downloaded to your phone or tablet for offline listening.

Prime Music should not be confused with Amazon Music Unlimited (see "What's not included with Amazon Prime," below), which offers a much larger library (think: Spotify), but costs extra. Prime subscribers do get a break on the price, though.

10. Unlimited photo storage

Much like Google, Amazon Prime offers subscribers unlimited cloud storage for photos. For most people that means using the Amazon Drive app to upload pictures from phones and tablets, but there's also a desktop app (for Windows and Mac) that can archive photos from your hard drive.

In addition, Prime Photos gives you 5GB of storage for documents and videos.

11. Access to Amazon Elements

Created primarily with parents in mind, Elements offers an array of baby products that meet various quality and transparency standards.

12. Access to Amazon Dash

You've probably seen Amazon's little product-branded buttons, which let you reorder various consumables (like paper towels or laundry detergent) with just one press. Each button costs $4.99, and each product order costs whatever it costs, but you need to be a Prime subscriber if you want to use Dash at all.

13. Early access to Lightning deals

Amazon's Lightning deals run for limited time or while supplies last. If you're a Prime subscriber, you get access to those deals 30 minutes ahead of nonsubscribers.

14. One free ebook per month

As part of your Prime subscription, you get access to the Kindle Owners' Lending Library, which lets you check out one e-book per month and read that book on any Kindle e-reader or Fire tablet. The catch: This particular library offers a relatively small selection; don't expect a lot of new titles or bestsellers.

15. One free ebook per month, part 2

It's called Kindle First, and it works like this: Each month, Amazon editors curate six yet-to-be-released books and give Prime subscribers the chance to pick one of them -- for free. And it's for keeps, too; you're not just borrowing the book.

16. Free books and magazines

Amazon's new Prime Reading feature differs from the Lending Library in a few key ways. First, it's not limited to Kindles: You can access the catalog of free ebooks on phones, tablets and anything else capable of running a Kindle app. Second, the selection includes not only books, but also a rotating selection of magazines, comics, travel guides, Kindle Singles and more.

17. Free Washington Post

Amazon CEO Jeff Bezos owns the Post, so it should come as no surprise that there's a deal to be had: a free six-month digital subscription, followed by a discounted rate of $3.99 monthly (normally $9.99). You can read the paper on your PC, a Fire tablet or any of the various Washington Post apps (available for Android and iOS).

18. Free audiobooks

Kind of like Prime Reading for audiobooks, Audible Channels for Prime (a $60-per-year value, according to Amazon) gives you unlimited access to a selection of original audio series and select audiobooks. Just keep in mind these are limited to streaming; you can't download them for offline listening.

19. Free games

Hardcore gamers know all about Twitch, which lets users watch and share game videos. Now, thanks to the recent addition of Free Games with Prime, you can get play some of those titles instead of just watching them.

At press time, for example, you could score five free games (including the super-hot indie title Superhot) with a combined value of over $100. And next month promises five more, including Telltale's popular Tales from the Borderland.

All you need is a free Twitch account that's been "enabled" for Prime and the Twitch desktop client.

20. Ad-free Twitch

Speaking of linking your Prime subscription to your Twitch account, there's another benefit: You get an ad-free viewing experience, along with one free Twitch channel per month and exclusive discounts on game purchases (assuming the aforementioned freebies aren't keeping you sufficiently entertained).

21. Exclusive phone discounts

In the market for a new phone? See if it's available via Prime Exclusive Phones, which carries a rotating selection of popular models that are usually priced less than what you'd pay elsewhere -- and that frequently go on sale for even less.

At press time, those models included the LG G6 ($420) and G6+ ($519.99), Motorola Moto X4 ($350) and G5 ($205) and Nokia 6 ($200). They're all sold unlocked.

Until recently, Prime Exclusive phones were saddled with a small catch: Amazon ads on the lock-screen. Thankfully, last month Amazon removed lock-screen ads from its phones (past and present models alike), though you'll still see an Amazon widget in the OS. (It's easily removed, though.)

22. Odds and ends

Amazon Prime lets you add premium video subscriptions -- Starz, Showtime and so on -- to your Prime Video viewing umbrella. (Alas, you don't get any discounts compared with purchasing those subscriptions separately.) As part of Amazon Family, you can score 20 percent off diaper purchases via Subscribe & Save and 15 percent off eligible products in your baby registry. And speaking of family, you're allowed to extend your membership to one additional adult living in your house.

What's not included with Amazon Prime

That's an awful lot of Prime goodness. However, a smattering of Amazon services aren't included with your subscription. Here's a look at what costs extra -- and how much extra.

Amazon Fresh

Although Prime does offer both grocery and local deliveries, Amazon Fresh -- currently available in only a handful of regions -- does not fall under that umbrella. Rather, the service is its own entity, promising same-day or next-day delivery from local grocery stores.

Just recently, Amazon eliminated the $299 up-front fee for a Fresh subscription; now it costs $14.99 monthly, though you must be a Prime subscriber to get it. (That means it still costs around $250 outright to get the service.)

Kindle FreeTime Unlimited

A subscription service designed expressly for ages 3 to 12, FreeTime Unlimited curates kid-friendly apps, ebooks, games, movies, TV shows and other content. It's compatible with Kindles, Fire tablets and the Fire TV, and it includes parental controls for things like setting time limits, adjusting content filters and reviewing any photos taken with the tablet.

You don't need to have a Prime subscription to get FreeTime Unlimited, but it's cheaper: $2.99 per month for one child or $6.99 per month for up to four children. If you don't have Prime, the service costs $4.99 and $9.99, respectively.

Kindle Unlimited

Kindle Unlimited appears to combine Prime Reading and Audible Channels, putting them together as a separate, standalone service. Thus you get access to a limited library of ebooks, magazines and audiobooks, all of which you can access on desktop and mobile devices.

However, the math makes no sense: Kindle Unlimited costs $9.99 per month, the same price you'd pay for a full-blown Amazon Prime subscription.

Music Unlimited

Amazon's answer to Apple Music, Spotify and the like gives you access to "tens of millions" of songs -- far more than you get from Prime Music. If you already have a Prime subscription, Music Unlimited costs $7.99 per month -- a few dollars less than the competition charges. However, a family plan makes it $14.99 per month whether you're a Prime subscriber or not, and that doesn't represent any savings over the competition. Indeed, you might want to investigate whether Amazon Music Unlimited is good deal for you before adding it to your account.

Updated, March 19, 2018: This article was originally published on Oct. 18, 2016, and continues to be updated as new benefits are added to Prime memberships.