Knock
UnclaimedCustomer engagement infrastructure for product-led growth, enabling cross-channel messaging and data activation.
Visit WebsiteReviews onG2Capterra
70 reviews trackedThe Bottom Line
Entry price
Free plan available, paid tiers above
Biggest pro
Comprehensive cross-channel messaging capabilities
Biggest con
Pricing for higher volumes can become significant with per-message/user costs
TL;DR - Knock
- Developer-first platform for building cross-channel customer messaging.
- Unifies real-time data to trigger personalized and timely communications.
- Offers robust tooling for developers including SDKs, CLI, and version control.
Pricing: Free plan available
Best for: Growing teams
4.9/5 across review platforms
What is Knock?
Knock is a customer engagement infrastructure designed for product-led growth, allowing businesses to send product, marketing, and transactional messaging across various channels. It provides developer-first tooling to build custom messaging experiences without compromising design, performance, or user experience, supporting channels like email, SMS, push, chat, and in-app notifications. The platform features an intuitive drag-and-drop editor for building messaging journeys and ensures on-brand, error-free communication with global styles, reusable blocks, and live previews.
The platform unifies and activates real-time data from product and warehouse sources, enabling relevant and timely messaging triggered by user attributes, events, or actions. It supports data ingestion from CDPs and reverse ETL, dynamic segmentation, and personalized messaging with conditional logic. Knock is built for developers, offering SDKs in major languages, a CLI, environments, version control, and CI/CD integration, making it suitable for integrating into existing development workflows and AI-powered IDEs. It also offers robust infrastructure with high uptime, scaled delivery, and compliance certifications like HIPAA, SOC2, GDPR, and CCPA.
Available on: Web
Pros & Cons
Pros
- Comprehensive cross-channel messaging capabilities
- Strong developer-first approach with SDKs, CLI, and AI IDE integration
- Robust data integration and personalization features
- High scalability and reliability (99.99% uptime, handles hundreds of millions of messages)
- Compliance with HIPAA, SOC2, GDPR, CCPA
Cons
- Pricing for higher volumes can become significant with per-message/user costs
- Enterprise features like advanced security and support require custom quotes
- Requires technical integration for full utilization of developer tools
Ratings Across the Web
4.9(70 reviews)
Ratings aggregated from independent review platforms. Learn more
Preview
Key Features
Send messages across email, SMS, push, chat, and in-appDrag-and-drop editor for messaging journeysGlobal styles, layouts, reusable blocks, and live previews for on-brand messagingPreference centers and send windows for user-first controlsIn-app messaging with custom components (paywalls, dialogs, nudges)Real-time data ingestion from product, warehouse, CDP, and reverse ETL sourcesDynamic segmentation using attributes, events, and relationsTrigger workflows from API calls, usage events, or segment changes
Pricing Plans
Pricing checked Jun 12, 2026
Developer
$0 / month
- 10K messages
- 500 guide active users
- Unlimited notification workflows
- Unlimited broadcasts
- Unlimited delivery channels
- Unlimited team members
- Batch and delay notifications
- Built-in multi-tenancy
Starter
$250 / month
- 50K messages
- Prepaid usage, then $.005 per message
- 2.5K guide active users
- Prepaid usage, then $.05 per user
- Everything in Developer
- Remove Knock branding
Enterprise
Contact us
- Flexible volume-based pricing
- Discounts available for high-volume customers
- Monthly notified user pricing available
- Everything in Starter
- Per-customer branding and preferences
- Translation (i18n) support
- Send analytics data to any data warehouse
- Send observability data to Datadog
How Knock's pricing compares
At $250/mo, Knock is the most premium of its 2 direct competitors.
Entry paid plan, monthly. Pricing checked Jun 12, 2026.
Reviews
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4.9/5
Across 70 verified user reviews on G2, Capterra
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Best Knock Alternatives
Top alternatives based on features, pricing, and user needs.
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Customer.ioPaid
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IterablePaid
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LeanplumFreemium
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Knock FAQ
How does Knock support real-time data activation for messaging?
Knock unifies and activates real-time data from both product and warehouse sources. This allows businesses to trigger relevant and timely messaging based on user attributes, events, or specific actions. It supports data ingestion from Customer Data Platforms (CDPs) and reverse ETL processes.
Which teams benefit most from using Knock?
Knock is ideal for product-led growth teams and developers who need to build custom messaging experiences. Its developer-first tooling, including SDKs, a CLI, and CI/CD integration, makes it suitable for engineering teams looking to integrate messaging into their existing workflows and AI-powered IDEs.
How does Knock compare to Iterable for cross-channel messaging?
Knock, similar to Iterable, offers comprehensive cross-channel messaging capabilities across email, SMS, push, chat, and in-app notifications. However, Knock emphasizes a strong developer-first approach with extensive tooling like SDKs and CLI, designed for deep integration into development workflows, while also providing an intuitive drag-and-drop editor.
What kind of messaging journeys can be built with Knock?
Knock allows for the creation of product, marketing, and transactional messaging journeys. Users can build these using an intuitive drag-and-drop editor, incorporating global styles, reusable blocks, and live previews to ensure on-brand and error-free communication.
Does Knock include a free tier?
Yes, Knock offers a free tier for users to get started. Paid plans are available for those requiring more usage and additional features beyond what the free tier provides.
What are the main trade-offs when considering Knock?
A primary trade-off for Knock is that pricing for higher volumes can become significant due to per-message or per-user costs. Additionally, full utilization of its developer tools requires technical integration, and enterprise features like advanced security and support necessitate custom quotes.
Can Knock integrate with existing development workflows?
Yes, Knock is built for developers and offers SDKs in major languages, a CLI, environments, and version control. It supports CI/CD integration, making it suitable for seamless integration into existing development workflows and AI-powered IDEs.
Source: knock.app