Compare

Most comparison pages in this category exist to move you toward whichever service pays the writer. These do not, and the easiest way to prove it is that two of the four comparisons here frequently conclude in favor of a public library card — which pays us nothing at all.

The comparison that actually matters

People arrive wanting to know whether Audible or Kindle Unlimited is better. It is nearly always the wrong question, because they do different jobs: one is an audiobook membership and the other is an ebook borrowing subscription, and they are billed separately. A commuter and a genre reader are not choosing between two options — they each have one obvious answer and one irrelevant product.

The comparison that decides something is between each subscription and what you would otherwise spend. That is arithmetic, it takes about ten seconds, and it can come out negative. Start with Audible versus Kindle Unlimited to work out which product you are even considering, then run the sum on the relevant decision page.

Format before service

If you have not settled whether you want to read or listen, the service comparison is premature. Reading versus listening is a question about what your week has room for rather than about which format is superior, and the answer is usually visible in your calendar: count the hours where your hands are busy and your attention is free, then count the hours you spend sitting down with nothing else demanding you. Whichever number is bigger is your format.

The free option, treated seriously

Both library comparisons here — Audible versus Libby and Kindle Unlimited versus Libby — start from the position that Libby is free, that we have no relationship with it, and that for a great many readers it is simply the right answer. What you pay a subscription for is not access to books in general; it is immediacy and selection. If your library serves you well and you do not mind a queue, you do not need to buy anything.

What a comparison here will and will not tell you

It will not tell you which service has the bigger catalog. Neither Amazon nor Audible publishes a catalog size we could verify against a page we can actually read, both numbers change constantly, and catalog size is the wrong test anyway — what matters is whether the specific books you want are in the one you are paying for. A subscription with two million titles and none of your five is worse value than one with a fraction of that and all five.

It will also not tell you that one service is better than another in the abstract. Every comparison here resolves into a description of the reader each option suits, because that is the only form the answer can honestly take. A commuter and a genre reader looking at the same two products should walk away with opposite conclusions, and a page that gives them both the same verdict has failed one of them.

What it will tell you is what each option verifiably costs and includes, on a date we print, with the source cited — plus the arithmetic to check it against your own habits. Where we could not verify something, the comparison says so rather than quietly filling the gap. The full method is on how we research.

The order to read these in

1. Format first. Reading versus listening — because choosing a service before you have chosen a format is how people end up paying for an audiobook subscription they never have time to use.
2. Then the free option. Audible versus Libby or Kindle Unlimited versus Libby, depending on the format you landed on. A library card costs nothing and frequently covers everything, and finding that out first saves you a subscription you did not need.
3. Then the paid head-to-head, if you still need it. Audible versus Kindle Unlimited exists mostly to stop people buying the wrong one of the two — they are separate subscriptions with separate catalogs, and Amazon's shared login makes that far less obvious than it should be.

Not sure which comparison you need? The two-minute version is on start here.