Millions of people subscribe to different services, and now Amazon can say it’s attained a major milestone of its own.

As reported by TechCrunch, Amazon Music has reached 55 million subscribers for its streaming service. That isn’t just paid subscribers, though. Amazon’s millions of listeners are across a variety of tiers, which includes 15 different subscription options of some kind, ranging from a free, ad-supported option to a $15 per month option.

Unfortunately, Amazon isn’t breaking down how many subscribers each tier has. The company says that its most expensive tier, Amazon Music Unlimited, saw more than a 50% growth.

We’re proud to reach this incredible milestone and are overwhelmed by our customers’ response to Amazon Music,” said Steve Boom, VP of Amazon Music, in a statement. “Our strategy is unique and, like everything we do at Amazon, starts with our customers. We’ve always been focused on expanding the marketplace for music streaming by offering music listener’s unparalleled choice because we know that different listeners have different needs. As we continue to lead in our investment in voice with Alexa, and in high-quality audio with Amazon Music HD, we’re excited to bring our customers and the music industry even more innovation in 2020 and beyond.

Interestingly, Amazon says it’s seeing more subscriber growth (based on “publicly available data”) than Apple Music. Specifically, twice as many subscribers per month:

We continue to feel very good about our competitive position in the market. Relative to Apple, the publicly available data shows that we are adding roughly twice as many subscribers per month as they are. Additionally, we believe that our monthly engagement is roughly 2x as high and our churn is at half the rate. Elsewhere, our estimates imply that we continue to add more users on an absolute basis than Amazon. Our data also suggests that Amazon’s user base skews significantly more to ‘Ad-Supported’ than ‘Premium’, and that average engagement on our platform is approximately 3x.

It’s worth noting that Amazon Music still has a long way to go when it coms to subscribers compared to the competition, though. Spotify, for instance, still holds a healthy lead with 248 million subscribers across its paid and free tiers, with 113 million subscribers paying the monthly subscription. And then there’s Apple Music, which, last summer, said it had over 60 million paid subscribers — and Apple Music doesn’t offer a free tier.

So Amazon Music is seeing plenty of growth, and Amazon’s happy with where the streaming service is. Are you a subscriber to Amazon Music?