Audible is the default, not the only option. Its per-credit model works if you finish a book a month and stick to bestsellers, but it punishes heavy readers and anyone reading outside the mainstream catalogue. The best alternative depends on what you read, so here they are sorted by reader type rather than a single ranking.
If you read a lot, fast
Credit-based plans are the worst fit for you, because you burn through a month's credit in days. Look at unlimited-style services and, more importantly, text-to-speech apps that read books you already own for a flat low fee. When your reading volume is high, paying per book is the expensive trap; paying once for the reader wins. See the math in affordable audiobook subscriptions compared.
If you read web novels or serials
Audible simply does not carry most web novels; narration is reserved for a tiny slice of popular titles. A text-to-speech reader is the only realistic option, since it turns any chapter into audio. ReadLume imports a web novel by URL and reads it aloud with auto-advance, from $2.50/month, far below Audible.
If you mostly read books you already own
Paying Audible again for a book sitting on your shelf as an EPUB makes little sense. A TTS reader plays your own PDFs and EPUBs, often for free. ReadLume reads your files at no cost. More options in cheap audiobook apps.
If you only want bestsellers, occasionally
Then free library apps like Libby are your best value at zero dollars, with the trade-off of waitlists. For a book or two a month, that may be all you need. The full roundup is in best audiobook apps under $5 a month.
The short version
Audible is worth it only for light, mainstream listening. If you read heavily, read serials, or already own the books, a text-to-speech reader like ReadLume is cheaper and covers more. It is free for your own PDFs and EPUBs, with web novels from $2.50/month and a 3-day free trial. See cheaper alternatives to Audible for fiction for the fiction-specific breakdown.
Find your cheaper alternative
ReadLume imports web novels by URL and reads them aloud, auto-advancing chapter after chapter with the screen off. Free for your own PDFs & EPUBs; web novels from $2.50/mo with a 3-day free trial.
Get ReadLume on Google Play