: A subscription-based service with a massive international catalog. Their app allows for easy offline downloading within the platform.

If you are looking for high-quality recordings and official apps, these services are the industry leaders:

: MP3 is the most compatible, but some modern apps use M4B (which supports chapters).

: Apps like Smart AudioBook Player (Android) or BookPlayer (iOS) are better than standard music players because they remember your position and allow for speed adjustments.

For classics and copyright-free books, these sites offer completely free MP3 downloads:

: Most paid sites like Litres let you listen to a 5–10 minute snippet to ensure you like the narrator's voice.

: A great resource if you are using audiobooks to learn languages. It offers textbooks, audio courses, and literature for download. 📂 Free and Public Domain Sources

: Excellent for finding serialized audiobooks or classic literature read by volunteers. It supports seamless syncing across all Apple devices.