OP3 has come up around here in some discussion.
Here’s a look at how the listening platforms compare, measured using OP3 data.
Why should you use OP3 with your podcast? Because you’re contributing to everyone’s ability to get some podcasting-wide statistics without the publishing platforms being involved.
You also get publisher-independent data: If you move podcast to another host, you don’t lose your statistics.
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updated to add this other thing that I found that is related…