Brilliant
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Anyone can apply, but there's a follower minimum or quality check.
What they sell
Interactive online courses in math, science, and computer science
One of the longest-running, highest-volume YouTube/podcast sponsors — over 12,000 tracked sponsor mentions since 2017, on channels like SciShow, Sabine Hossenfelder, and blackpenredpen. Budget skews toward established education/tech channels (median sponsored channel has ~1.1M subscribers), but they keep a rolling database of creators who don't yet fit and follow up as they expand. Direct reply from Brilliant's Marketing Ops after an outreach test: "While your channel doesn't meet our current specifications, I have added you to our database and will reach out when we're expanding our sponsorships." General inbox for sponsorship inquiries: sponsors@brilliant.org.
brilliant.org