Sweet spot: a creator with 1K–100K engaged subscribers whose business is some mix of newsletter, course, ebook, or community — meaning email is the primary revenue channel, not a marketing afterthought. Kit's automation depth and creator-native primitives (digital products, paid subs, Creator Profile, Network) collapse what would otherwise be Substack + Gumroad + Linktree + Mailchimp into one bill, which is what justifies the per-subscriber pricing.
Failure modes. First, the per-subscriber pricing punishes list bloat — if 40% of your list never opens, you're paying full price to host dead weight. Set a quarterly sunset rule and automate it. Second, the Creator Network is a real growth lever in some niches (business, productivity, finance, writing) and a graveyard in others (hyper-narrow B2B, regional consumer); audit cohort quality after 60 days. Third, the rebrand from ConvertKit to Kit confused some long-time customers and SEO equity took a hit — search-driven discovery of help docs is worse than it was in 2023.
What to pilot. Migrate your existing list (Kit offers free done-for-you migration above 5K subscribers). Re-build your top-performing automation sequence and your weekly broadcast. After 60 days, compare deliverability (inbox placement), open rate, click rate, and revenue-per-subscriber against the previous platform. If two of those four numbers improve and the Creator Network adds 5%+ subscribers, Kit is the right home. If numbers are flat, the platform isn't the bottleneck — your offer or copy is.