Postmark vs Knock

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Postmark compared with Knock
Detail	Postmark	Knock
What it does	Fast, Reliable Email Delivery Service	Customer engagement infrastructure for product, marketing, and transactional messaging
Stage	Established	Not given
Founded	2010	Not given
Based in	Not given	Not given
Pricing model	freemium	Not given
Pricing	Free plan with 100 emails/month. Paid plans starting at $15/month for 10,000 emails, with additional tiers at $16.50/month and $18/month. Extra emails charged at $1.80-$1.20 per 1,000 depending on plan.	Not given
Key features	Email API SMTP Service Message Streams Email Templates Inbound Email processing Analytics & webhooks Email open and link tracking Bulk API	Cross-channel message routing Batch and delay notifications AI-powered message generation In-app messaging with custom components AI agents for messaging tasks Data unification and activation Version control and environments Observability and analytics
What makes it different	Industry-leading delivery speed, up to 4x faster than other providers Stellar deliverability without requiring dedicated IP Knowledgeable customer support included with all plans	AI-native messaging agents to build campaigns in minutes instead of days 99.99% uptime SLA for production reliability Developer-first with SDKs in all major languages and CLI integration No-code workflow builder enabling non-technical teams Unified platform for product, marketing, and transactional messaging
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	85 no change since last check	71 no change since last check
Trust Flow (Majestic)	44	36
Citation Flow (Majestic)	54	48
Referring domains (Majestic)	8026	1057

3 details filled in for both companies.

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