What the feed contains
The feed lists the show title, description, artwork and category, and each episode with its title, description, date and a link to the audio file.
Who creates it
Your podcast host generates and updates the feed when you upload an episode. You do not write it by hand.
How apps use it
Each platform asks you to submit the feed once. After that the app checks it regularly and shows new episodes when they appear.
Checks before you submit
Check that the feed loads in a browser, that the artwork meets the platform's size rules, that episodes have titles and dates and that the audio links work.
Keep the feed stable
Changing hosts or the feed address can break subscriptions. If you move, use the redirect the old host provides. radio.app delivers files and does not host: see platforms.