Sponsor comparison
Calm vs Castmagic
Newsletter sponsorship activity, audience reach, and ad formats — side by side.
Sponsorship breakdown
Health & Wellness
Artificial Intelligence
Smarter Brain Insider
20K subscribers
The Intelligence Age
50K subscribers
20K subs
50K subs
Calm - Builds stillness and reflective thinking through guided breathing, medita…
January 2026
January 2024
Ad copy examples
Calm
Calm - Builds stillness and reflective thinking through guided breathing, meditation, and ambient soundscapes — perfect for cognitive reset.
Castmagic
No ad copy available
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