Substack vs Kit (ConvertKit) Fee Calculator
Compare Substack 10% cut against Kit Creator + 3.5% Kit Commerce fee across paid subscriber counts.
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Substack
$200.00/mo
$2,400/year estimated fees
10% Paid Revenue Share — Free if you never charge readers, but once you turn on paid subscriptions, Substack takes 10% forever PLUS ~3.6% + $0.30 Stripe + Billing fees.
Kit (ConvertKit)
$189.00/mo
$2,268/year estimated fees
Newsletter (Free) & Creator Plan — Newsletter plan is $0 up to 10,000 subscribers (limited to 1 basic sequence); multi-step automations require the Creator plan above.
12-month difference
Kit (ConvertKit) saves you $132 per year at this volume.
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Common questions
Is Substack cheaper than Kit (ConvertKit)?
Under our baseline scenario, Substack costs $200.00/month while Kit (ConvertKit) costs $189.00/month—making Kit (ConvertKit) cheaper by $132 over 12 months. Adjust your own volume in the interactive calculator above to check your exact break-even point.
What hidden fees change the Substack vs Kit (ConvertKit) winner?
Compare Substack 10% cut against Kit Creator + 3.5% Kit Commerce fee across paid subscriber counts.
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