Kit (ConvertKit) vs Substack for Writers: 2026 Comparison
Kit ($39/mo, automations) vs Substack (free + 10% cut) for paid newsletter writers. Platform cut vs flat fee math, list portability, and iOS Apple tax compared.
EmailTool™ Score
How we scoreComposite score based on features, pricing, deliverability, and reported friction severity.
Cost Calculator
Estimated monthly cost based on your contact list size.
Kit (ConvertKit)
Free/mo
Substack
Free/mo
Estimates based on published starting prices with proportional contact scaling. Actual pricing varies by plan tier and billing cycle. Check vendor sites for exact quotes.
Feature Comparison
| Feature | Kit (ConvertKit) | Substack | Edge |
|---|---|---|---|
| Pricing model | Flat $39/mo (up to 10K subs) | Free + 10% revenue cut | |
| Total take at $10K/mo revenue | $39/mo fixed | 10% + Stripe 2.9% = ~$1,600/mo | Kit |
| iOS in-app payment fee | N/A | Up to 30% Apple fee on top of 10% | Kit |
| List portability / exit | Full CSV export + API access | Export allowed but discovery/network stays | Kit |
| Automation builder | Visual multi-step automations | None — broadcast only | Kit |
| Built-in discovery / audience network | Recommendations network | Substack network drives organic growth | Substack |
| Creator exodus signal (2025) | No mass exit reported | ~3,000 creators left, 1,000 to Beehiiv Q1 alone | Kit |
| Support quality | Email + chat | Bot-only; accounts suspended without warning per Trustpilot | Kit |
| Subscription fee continuance | Standard cancellation | Trustpilot: fees charged years after cancellation | Kit |
| Best for | Writers building an owned, automated funnel | Writers trading ownership for network-driven discovery |
Real Friction Points
Manually researched issues reported by actual users. Not AI-generated.
Kit (ConvertKit)
Kit's September 2026 pricing change more than doubled the Creator plan from $15/mo to $33/mo, and at 5,000 subscribers the plan now costs $66/mo — more expensive than MailerLite ($10) and Mailchimp ($13) at equivalent list sizes per emailtooltester and Podia reviews. Podia's survey found 37% of past users cite price as their #1 complaint. Template selection is also thin at just 15 designs with no free-form column layouts, and advanced reporting, engagement scoring, and A/B testing are gated behind $66/mo Creator Pro with only a 90-day data retention window on the standard tier.
Substack
Substack takes 10% of subscription revenue plus Stripe's 2.9% + $0.30 = roughly 16% total on a $10/mo sub, and iOS in-app payments add Apple's up-to-30% fee on top per postion.app and on.substack.com analyses. An estimated 3,000 creators left Substack in 2025 citing the 10% cut, with ~1,000 migrating to Beehiiv in Q1 2025 alone and GRIT Capital moving 360,000 subscribers in a single migration per daige.st. Trustpilot also documents subscription fees still charging years after cancellation, draft articles being publicly reachable before publication, and accounts suspended without warning through a bot-only support channel.
The Verdict
Choose Kit if your newsletter is (or will be) a business — the flat $39/mo beats Substack's 10% cut above $4K MRR, and automations plus list portability are real leverage. Choose Substack only if you're starting from zero and the network-discovery tailwind matters more than ownership; switching later is possible but costly in audience size.
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