Long essays, weekly roundups and serialised fiction. Share any Substack post to Readible and listen on a walk, with the pop-ups and buttons left out.
Updated

To listen to a Substack post on iPhone, tap Share in the Substack app or Safari and choose Readible, or paste the post link on Readible's Home. Readible removes the "continue reading" pop-up that shared links show and reads the post aloud with sentence highlighting.
Yes. Share the post to Readible from the Substack app, Mail or Safari, or paste its link, and Readible reads it aloud.
If you can read the whole post in Readible's browser, Readible can read it aloud.
Yes. Any newsletter with a web version works the same way. Article to audio.
The free plan includes 10 hours of cloud voices every 30 days, one Kindle import a month and unlimited offline voices. Pro is $2.99 a month or $24.99 a year.