Our take
Pick Knock if product / growth teams who will stay on Developer $0 (10K messages, 500 guide users, 500 AI credits, no Knock branding removal) while they ship a first workflow, then land on Starter at $250/month (50K messages, then $.005/message) when they need previews and the branding off. Pick Resend if app teams who will stay on Transactional Free $0 (3,000 emails, 100/day, 3 inboxes, no card) while they send a
Best for
Knock Messages you start at $0 / 10K
Resend Email you start at $0 (3,000 transactional / month, 100/day)
Free plan
Knock $0 · /month. 10K messages (workflows + broadcasts). 500 guide active users. 500 AI agent credits, then $0.01/credit. Unlimited workflows, broadcasts, channels, and team members. Batch and delay. Multi-tenancy. Google SSO
Resend $0 · 3,000 emails. 100/day cap. 3 domains. 3 inboxes. 10,000 automation runs (no overage). 30-day retention. Ticket support
Lowest paid
Knock Starter $250/user/mo
Resend Pro $20/mo
Next step up
Knock
Resend Pro marketing $40
Watch out
Knock $0 includes 10K messages
Resend Free transactional is 100 emails/day
Last checked
Knock 2026-10-22 · knock.app/pricing
Resend 2026-10-22 · resend.com/pricing
product / growth teams who will stay on Developer $0 (10K messages, 500 guide users, 500 AI credits, no Knock branding removal) while they ship a first workflow, then land on Starter at $250/month (50K messages, then $.005/message) when they need previews and the branding off.
Read the Knock pageapp teams who will stay on Transactional Free $0 (3,000 emails, 100/day, 3 inboxes, no card) while they send a first receipt, then buy Pro at $20/month when they need 50,000 emails and no daily cap — and add Marketing only when they have a list.
Read the Resend page
