SparkToro

SparkToro is an audience research tool co-founded by Rand Fishkin that tells you where your target audience spends time online. You search by keyword, website or description and it surfaces the podcasts they listen to, YouTube channels they watch, subreddits they visit, social accounts they follow and more. It's especially useful for content marketers, PR teams and founders who want to make smarter decisions about where to advertise, what to write about, and who to reach out to. A free plan with 5 searches a month is available, with paid plans starting at $50 a month.