Courier vs Knock
Side-by-side comparison of features, pricing, ratings, and alternatives.
Courier is a multichannel notification platform that lets developers send email, push, SMS, in-app, and chat messages through a single API and journey builder, rather than integrating separately with each channel provider. It positions itself as "the messaging platform for humans and AI agents," adding an AI Agent node and AI-powered translations to its journeys and broadcast tooling. Note: the product's original domain trycourier.com now permanently redirects to courier.com. The platform includes an inbox component for in-app notifications, user preference management, and observability integrations, with pricing based on message volume rather than seats or channel count. The free Developer tier includes 10,000 sends per month with journeys, broadcasts, an MCP server, a CLI, and SDKs; paid usage is billed per send, and Enterprise adds dedicated support, RBAC, SLAs, and EU data residency.
Knock is a customer engagement and notifications platform that gives developers a single API and workflow builder for sending messages across email, SMS, push, chat, and in-app channels. Instead of building and maintaining custom notification pipelines, teams define reusable workflows with preferences, batching, and delivery logic, while non-technical teammates can edit content and audiences without redeploying code. Knock pulls in real-time data from data warehouses, CDPs, and webhooks to drive dynamic audience segmentation and personalized content, and it offers AI-assisted workflow creation from natural language prompts. It's used by companies like Vercel, Webflow, and Medium to handle hundreds of millions of messages per month, with SDKs for 8+ languages and compliance support for HIPAA, SOC2, GDPR, and CCPA.
- Generous free tier of 10,000 sends per month including journeys and broadcasts
- Per-send pricing scales predictably without per-seat costs
- Prebuilt inbox and preference-center components reduce custom UI work
- MCP server and CLI support integration with modern AI-assisted development workflows
- Free Developer tier includes 10,000 messages/month with all delivery channels unlocked
- Visual workflow builder lets non-technical teammates manage notification content directly
- Broad SDK coverage across 8+ languages simplifies integration for varied tech stacks
- Enterprise-ready compliance (HIPAA, SOC2, GDPR, CCPA) out of the box
- Original trycourier.com domain now redirects, which can confuse users following older links or bookmarks
- Per-send pricing at scale can become expensive compared to flat-rate competitors for very high volume
- Enterprise features like SLA and RBAC require contacting sales rather than transparent self-serve pricing
- Starter plan jumps to $250/month, a steep step up from the free tier for growing teams
- Homepage pricing does not list specific per-channel costs, requiring a pricing page dive to compare
- Best suited to teams already comfortable integrating a dedicated notifications API rather than a plug-and-play tool
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View all →The Verdict
AI-generated from listing dataBoth Knock and Courier offer free tiers with 10,000 messages/month, but Knock focuses on a visual workflow builder and broader SDK language support, while Courier emphasizes AI‑enhanced journeys, prebuilt inbox UI, and per‑send pricing.
Key differences
- •Knock provides a visual workflow builder for non‑engineers; Courier offers a visual journey builder with AI Agent node and translation.
- •Knock ships SDKs for 8+ languages; Courier lists SDKs only generically for major languages.
- •Courier includes prebuilt inbox UI and preference‑center components; Knock does not mention UI components.
- •Pricing: Knock’s paid tier starts at $250/month flat; Courier charges per‑send after the free tier.
- •Enterprise compliance: Knock explicitly lists HIPAA, SOC2, GDPR, CCPA; Courier’s enterprise features are less detailed.
Pricing & value
Courier’s per‑send pricing scales predictably after 10,000 free sends; Knock jumps to a $250/mo flat fee.
Ease of use / learning curve
Knock’s visual workflow builder lets non‑technical teammates edit content directly, reducing learning overhead.
Features & depth
Courier adds AI‑powered translation, AI Agent node, and prebuilt inbox UI, extending functionality beyond basic messaging.
Integrations & ecosystem
Knock lists specific integrations with data warehouses, CDPs, webhooks, Slack, Salesforce; Courier lists only Slack and observability tools.
Collaboration
Knock supports CI/CD‑style version control and rollback for notification workflows, aiding team collaboration.
Scalability
Knock guarantees 99.99% uptime at hundreds of millions of messages; Courier’s scalability details not specified.
Support
Courier offers chat support (Business) and dedicated Slack for Enterprise, whereas Knock provides only email and priority Enterprise support.
Security & privacy
Knock explicitly lists HIPAA, SOC2, GDPR, CCPA compliance; Courier’s security certifications not specified.
Migration / lock‑in
Both are SaaS, closed‑source APIs with no open‑source option; migration effort similar.
Choose Courier if…
Teams prioritizing AI‑enhanced journeys, prebuilt UI components, and per‑send pricing flexibility.
Choose Knock if…
Teams needing strong compliance, extensive SDK language support, and visual workflow versioning for large‑scale notifications.
Common questions
What is the free tier limit for each platform?
Both Knock and Courier offer 10,000 messages/sends per month on their free tier.
How does pricing change after the free tier?
Knock’s starter plan costs $250/month flat; Courier charges per‑send beyond the free 10,000, scaling with volume.
Which product provides more compliance certifications?
Knock lists HIPAA, SOC2, GDPR, and CCPA compliance; Courier does not specify any compliance certifications.