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Loops vs Substack
Loops: SaaS teams sending product, marketing, and transactional email. Substack: Writers making money doing the work they believe in. Same fact set for both, straight from each vendor's docs.
Loops
- Free tier
- Free plan: up to 1,000 contacts, 4,000 sends/mo
- Paid from
- $49/mo (contact-based; unlimited sends) · pricing page
- Public API
- Yes docs
- MCP server
- No · Official MCP server planned but not yet available (loops.so/agents/mcp)
- Best for
- SaaS teams sending product, marketing, and transactional email
- Website
- https://loops.so
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?
Loops suits saas teams sending product, marketing, and transactional email. 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 Loops alternatives, Substack alternatives, or the full table.