What is Dynamic Ad Insertion?

How insertion works

With dynamic ad insertion, shortened to DAI, you mark ad slots in an episode rather than editing ads into it: a pre-roll before the content, one or more mid-rolls at chosen timestamps, a post-roll at the end. The host assembles the audio at download time, so a listener in Berlin today can hear a different spot from a listener in Toronto next month on the same episode. Baked-in ads are the alternative: edited into the master file, identical for everyone, and permanent unless you re-upload.

Why the back catalogue matters

The case for DAI is almost entirely about old episodes. A show with 150 episodes and a steady trickle of new listeners working through the archive has thousands of monthly downloads landing on episodes published years ago, and with baked-in ads every one of those downloads serves a sponsor who stopped paying. Put your own agreed rate through the arithmetic: at a $22 CPM for one mid-roll, 9,000 monthly archive downloads are 9,000 / 1,000 x 22 = $198 a month, or close to $2,400 a year from work already done. The same mechanism lets you pull a spot the day a sponsor's product is discontinued, which a baked-in read cannot do.

What you give up

A produced dynamic spot is not the same product as a host read. The host read carries the endorsement, and many shows keep their anchor sponsor baked in for that reason and use DAI for everything else. There is a listener-experience cost too: an insertion point chosen by timestamp rather than by ear can land mid-sentence, so the slots need placing at natural breaks and checking after each upload. Variable ad loads also mean two listeners report different episode lengths, which confuses anyone comparing notes.

Checking your host

DAI happens at the hosting layer, not in your editor, so the question is whether your plan includes it and at which tier rather than which software to buy. Buzzsprout lists its Audio plan at $15 per month and Transistor its Starter plan at $19 per month, both checked 1 October 2026, and plans differ in download allowance as well as features, which is the trade-off the Buzzsprout and Transistor comparison works through. Because the ads are stitched into the file the RSS feed points at, moving hosts later means re-doing the slots. The podcast hosting category lists the alternatives, and our creator calculators will price archive inventory against your own download numbers.

Frequently asked questions