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Kartra vs Substack
Kartra: Solopreneurs running funnels, checkout, and email in one platform. Substack: Writers making money doing the work they believe in. Same fact set for both, straight from each vendor's docs.
Kartra
- Free tier
- No free plan; 14-day free trial; cheapest plan caps at 10,000 emails/mo
- Paid from
- $59/mo Essentials (500 contacts, 10,000 emails/mo); Starter $119/mo has unlimited emails · pricing page
- Public API
- Yes docs
- MCP server
- No · No official or community Kartra MCP found; API docs site currently 404s
- Best for
- Solopreneurs running funnels, checkout, and email in one platform
- Website
- https://kartra.com
Substack
- Free tier
- Free to publish, no subscriber cap
- Paid from
- No monthly fee; 10% of paid subscription revenue plus Stripe fees · pricing page
- Public API
- Yes docs
- MCP server
- Community · Community servers on GitHub only
- Best for
- Writers making money doing the work they believe in
- Website
- https://substack.com
Which one?
Kartra suits solopreneurs running funnels, checkout, and email in one platform. Substack suits writers making money doing the work they believe in. Pricing changes; the fact tables above link both vendors' live pricing pages. For the rest of the field, see Kartra alternatives, Substack alternatives, or the full table.