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Castmark
One sponsor link for your podcast episodes (+ analytics)
Castmark gives podcasters one durable redirect link per sponsor. Paste it into your show notes once, in every episode. When a sponsor changes their destination URL, update it in Castmark and every episode, past and future, points to the new link instantly. No more re-editing old show notes. Every click is logged by device, referrer, and time, then rolled up per sponsor, per campaign, and per episode, so you can tell a sponsor exactly which episodes drove clicks instead of guessing.
Hey Product Hunt,
I built Castmark for a common problem for podcasters: a sponsor's URL changes, and now you're hunting through months of show notes trying to update a link that's pasted into 40+ episodes.
Castmark fixes this with one idea: paste a single durable link into your show notes once. When the destination changes, you update it in one place and every episode, past and future, points to the new URL instantly.
It also tracks clicks by device, referrer, and time, and can attribute those clicks back to the specific episode they came from. So instead of telling a sponsor "I think episode 12 did well," you can show them the actual numbers by episode.
It's $19/month with a 14-day free trial, and if you ever cancel, your redirect links keep working.
Would love feedback, especially from anyone running sponsor links on a podcast catalog.
About Castmark on Product Hunt
“One sponsor link for your podcast episodes (+ analytics)”
Castmark was submitted on Product Hunt and earned 5 upvotes and 1 comments, placing #59 on the daily leaderboard. Castmark gives podcasters one durable redirect link per sponsor. Paste it into your show notes once, in every episode. When a sponsor changes their destination URL, update it in Castmark and every episode, past and future, points to the new link instantly. No more re-editing old show notes. Every click is logged by device, referrer, and time, then rolled up per sponsor, per campaign, and per episode, so you can tell a sponsor exactly which episodes drove clicks instead of guessing.
On the analytics side, Castmark competes within Productivity — topics that collectively have 657.7k followers on Product Hunt. The dashboard above tracks how Castmark performed against the three products that launched closest to it on the same day.
Who hunted Castmark?
Castmark was hunted by Michael Mangialardi. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Castmark including community comment highlights and product details, visit the product overview.
Michael Mangialardi