The best alternatives to Remarks are Breaker, Audiosear.ch, and Bitcast.fm. If these 3 options don't work for you, we've listed a few more alternatives below.
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Tanka— Tanka = Slack + Glean, built for fast-growing startups.
Saycaster is a platform for people to interact with specific moments in podcasts as you hear them. Podcasters pin specific 'Spots' to their podcasts, allowing listeners to discover content as they hear it.