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Mailgun vs Substack
Mailgun: Developers sending transactional email via API. Substack: Writers making money doing the work they believe in. Same fact set for both, straight from each vendor's docs.
Mailgun
- Free tier
- Free plan: 100 emails/day
- Paid from
- $15/mo (Basic, 10,000 emails/mo) · pricing page
- Public API
- Yes docs
- MCP server
- Yes · Official open-source MCP server, documented in Mailgun docs (github.com/mailgun/mailgun-mcp-server)
- Best for
- Developers sending transactional email via API
- Website
- https://www.mailgun.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?
Mailgun suits developers sending transactional email via api. 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 Mailgun alternatives, Substack alternatives, or the full table.