AI visibility report
Knock ranks #1 in Communications APIs AI search.
Outside the top three on 13 of the 25 prompts buyers actually ask.
Twilio is cited on 6 of those losses.
Free trial. Setup comes pre-filled for Knock.
Track Knock across these prompts daily.
Start free trialBest among 12 vendors · still absent from 77.3% of tracked prompt responses
Top-3 citations across 150 prompt × platform pairs
Peer Ranking
Key Metrics
Platform Breakdown
Grok
Gemini Search
Google AI Mode
Perplexity
ChatGPT
Bing CopilotMost visible, not fully covered. Knock has the most presence among 12 vendors, but appears in only 22.7% of tracked prompt responses. Presence is absolute coverage; share of voice shows how much of the citation pool it owns.
Where Knock is losing
Prompts where competitors are visible and Knock is not.
These prompt-level losses are the first prompts to track and repair.
Where Knock is winning5
Which communications APIs integrate best with CRMs and marketing automation tools so sales teams can see notification history alongside customer records?
Avg # 1.0 · 1 platform
Which email API providers make switching SPF, DKIM, and DMARC records easiest without disrupting deliverability?
Avg # 1.0 · 1 platform
Which communications API providers give the best visibility into delivery failures, retries, and notification debugging?
Avg # 2.5 · 2 platforms
Which notification infrastructure platforms integrate with CDPs to drive personalized cross-channel messaging automatically?
Avg # 2.5 · 2 platforms
Which notification infrastructure platforms handle user preference management best so recipients can control what they receive and on which channel?
Avg # 5.4 · 5 platforms
Where Knock is losing5
Which unified communications APIs handle both programmatic email sending and visual template editing for non-technical teams?
Competitors on 5 platforms
Track this promptWhat transactional email APIs handle very high-volume bulk sends alongside triggered one-to-one emails without separate infrastructure?
Competitors on 3 platforms
Track this promptWhich communications API platforms are designed with portability in mind — making it easy to swap providers for routing and template logic without a full rewrite?
Competitors on 3 platforms
Track this promptWhich SMS API providers make it easiest to migrate sending infrastructure without breaking existing 2FA flows for users?
Competitors on 3 platforms
Track this promptWhich voice API platforms handle IVR flows and programmable call routing well for building a basic customer support phone system?
Competitors on 2 platforms
Track this prompt
Track Knock daily before the next report refresh.
Track these gapsResearch dossierCapabilities, use cases, sources, reviews, pricing, and FAQ
Overview
Knock (knock.app) is a developer-first notification infrastructure and customer engagement platform founded in 2021 and headquartered in Brooklyn, New York. Built by Sam Seely and Chris Bell—previously engineering and product leaders at Frame.io—Knock provides a unified API, workflow engine, and UI component library that enables SaaS product teams to orchestrate cross-channel notifications across email, SMS, push, in-app feeds, and chat without building and maintaining custom infrastructure. Knock delivers hundreds of millions of messages per month and is used in production by companies including Vercel, Amplitude, Webflow, Medium, Discogs, and Clay. The platform is SOC 2, HIPAA, GDPR, and CCPA compliant with a stated 99.99% uptime target.
Knock is notification infrastructure and customer engagement software that gives engineering and product teams a single platform to design, orchestrate, and deliver cross-channel messaging. Its core primitives include a visual workflow editor with batch, delay, branch, throttle, and AI agent step functions; an in-app UI component library (feeds, toasts, guides); a broadcast tool for one-time campaigns; a preference and unsubscribe management system; and a developer toolkit (CLI, CI/CD integration, MCP server, SDKs in 8 languages). Knock acts as an orchestration layer on top of downstream email, SMS, push, and chat providers rather than replacing them.
Key Facts
- Founded
- 2021
- HQ
- Brooklyn, New York, US
- Founders
- Sam Seely, Chris Bell
- Employees
- 11-50
- Funding
- $18M
- Status
- Private
Target users
Key Capabilities10
- Multi-channel workflow engine (email, SMS, in-app, push, chat) with visual editor
- Batch, delay, throttle, and branch logic functions within workflows
- Pre-built and bring-your-own in-app notification feed, inbox, and toast components
- Broadcast messaging for one-time campaigns to custom audiences
- User preference management and commercial unsubscribe controls
- AI-native workflow building via Knock Agents, MCP server, and agent toolkit
- Infrastructure-as-code: CLI, version control, environments, and CI/CD integration
- Cross-channel observability, analytics, and Datadog/warehouse streaming
- Multi-tenancy with per-tenant branding, preferences, and translations (i18n)
- SDKs in 8 languages plus a Management API for programmatic dashboard control
Key Use Cases8
- Product notification systems (user invites, activity alerts, access requests)
- Transactional and lifecycle messaging across email, push, and SMS
- In-app notification feeds, inboxes, and real-time toasts
- Marketing and feature announcement broadcasts
- AI agent human-in-the-loop messaging workflows
- B2B SaaS multi-tenant notification infrastructure
- Alerting and monitoring notification pipelines
- Replacing homegrown, hard-to-maintain in-house notification systems
Knock customer outcomes
In-app feed prototype in <1 hour
Vercel built a working in-app feed demo using Knock in less than an hour, shipped multi-channel notifications with WebSocket-powered real-time feeds and React hooks, and enabled customer success engineers and product managers to troubleshoot and update notification templates with
~3 days for non-engineer to build and ship an email end-to-end
Medium shifted notification creation from an engineering bottleneck to a self-serve function: non-engineers can now build, test, and ship an email in approximately three days, and the marketing team ran the Black Friday push notification campaign mostly hands-off for engineering.
Days to ship vs. 1+ month previously
Clay unblocked its marketing and education teams to launch in-app notifications in days rather than a month or more by installing the React SDK, customizing CSS, and going live without deep engineering investment.
Weeks of work reduced to minutes
Amplitude's engineering team reported that complex notification flows—including batching, delays, and multi-channel delivery—that previously took weeks to implement now take minutes using Knock's workflow engine and dashboard.
Recent Trend
How AI describes Knock3
Knock : A developer-focused notification infrastructure that offers a visual workflow builder and template editor, allowing non-engineers to manage multi-channel notifications.
Which SMS API providers make it easiest to migrate sending infrastructure without breaking existing 2FA flows for users?
https://knock.app/blog/build-v-buy-notifications 
38The 5 best notification infrastructure platforms for developers in 2026 | Knock
knock.app·Blog Post
- 11
Knock vs Novu | Best Novu alternative for notifications
knock.app·Blog Post
- 9
Introduction to notification infrastructure | Knock
knock.app·Documentation
- 9
Top 11 SMS providers for developers in 2026 | Knock
knock.app·Comparison
- 9
The top 7 marketing data platforms in 2026 | Knock
knock.app·Blog Post
- 7
The 11 best transactional email services for developers in 2026 | Knock
knock.app·Comparison
Alternatives in Communications APIs6
Knock positions itself as developer-first notification infrastructure purpose-built for product-led SaaS teams, sitting between raw CPaaS providers (Twilio, Sinch) and marketer-oriented engagement platforms (Braze, Iterable).
- Its differentiator is a unified workflow engine that abstracts multi-channel orchestration—batching, throttling, preferences, in-app feeds—into a single API layer, enabling engineering teams to treat notifications as production infrastructure (with CI/CD, version control, and CLI) while also giving non-engineers a no-code dashboard to manage templates and campaigns.
- Knock increasingly competes upmarket against traditional customer engagement platforms on developer experience and AI-native tooling.
Reviews
Praised
- Clean, well-documented APIs
- Fast time-to-implement (hours not weeks)
- Visual workflow builder with batching and delay logic
- Responsive customer support and Slack support channel
- Empowers non-technical team members to manage notifications
- Reliable, production-grade infrastructure
- Rich in-app notification feed and UI components
- Centralizes multi-channel notifications in one platform
Criticized
- Missing features flagged by multiple reviewers
- Limited template creation options
- Weak campaign performance analytics
- Golang SDK quality and typing issues
- Learning curve for advanced workflow configurations
- Notification delivery issues noted by some users
- No declarative workflow definition (e.g., Terraform provider)
- Customers still pay separately for downstream channel providers
Knock holds a 4.6/5 rating across 144 G2 reviews (81% five-star), praised primarily for its clean and well-documented APIs, fast time-to-implement, powerful visual workflow builder, and highly responsive customer support. Product Hunt reviewers highlight reliability and breadth of features including templating, scheduling, in-app feeds, and out-of-the-box integrations. Common criticisms include missing features flagged by some reviewers, limited campaign performance analytics compared to full marketing platforms, and some SDK quality gaps (notably the Go client). Overall sentiment is strongly positive, with users frequently citing that Knock replaced weeks of custom engineering work.
Pricing
Knock offers three tiers. Developer (free): up to 10,000 messages/month, 500 guide active users, 500 AI agent credits, unlimited workflows and channels, 99.9% uptime SLA. Starter ($250/month): 50,000 messages included ($0.005 per additional), 2,500 guide active users ($0.05 per additional), 2,000 AI agent credits, removes Knock branding. Enterprise (contact sales): flexible volume-based or monthly notified-user pricing, annual commit discounts, dedicated infrastructure, HIPAA BAA, SAML 2.0 SSO, SCIM directory sync, Datadog/warehouse analytics streaming, 90-day log retention, and enterprise SLAs. Knock does not charge for workflow triggers or recipients—only for messages successfully sent.
Limitations
- G2 reviewers flag missing features (cited by 19 reviewers), limited template options (8 reviews), and difficult learning curve for advanced use cases (7 reviews).
- Some users note limited campaign performance analytics compared to dedicated marketing platforms.
- One technical review cited a sub-par Golang SDK with limited strong typing support and no clean git-based payload spec management.
- Knock does not manage billing for downstream providers (e.g., Twilio, Postmark), so customers pay Knock fees plus downstream channel costs.
- The free Developer plan caps at 10,000 messages/month.
Frequently asked questions
Topic coverageCoverage by buyer topic
Topic Coverage
Prompt-Level Results
| Prompt | ChatGPT | Bing Copilot | Gemini Search | Google AI Mode | Perplexity | Grok |
|---|---|---|---|---|---|---|
Capability2/5 cited (40%) | ||||||
Which voice API platforms handle IVR flows and programmable call routing well for building a basic customer support phone system? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited |
Which communications APIs support building real-time in-app chat with message threading, reactions, and file attachments, not just simple notifications? | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
What transactional email APIs handle very high-volume bulk sends alongside triggered one-to-one emails without separate infrastructure? | A competitor was cited | A competitor was cited | Your brand and a competitor were cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited |
Which unified communications APIs handle both programmatic email sending and visual template editing for non-technical teams? | A competitor was cited | A competitor was cited | A competitor was cited | A competitor was cited | A competitor was cited | A competitor was cited |
Which multi-channel notification platforms support fallback logic — like falling back to SMS if a push notification isn't opened within an hour? | A competitor was cited | A competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited |
Developer Experience3/5 cited (60%) | ||||||
Which communications API platforms give product teams control over notification templates without engineering involvement day-to-day? | A competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited | Your brand and a competitor were cited |
Which communications API platforms are least opinionated about the user data model and easiest to integrate with an existing user table? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited | A competitor was cited |
Which notification infrastructure platforms handle user preference management best so recipients can control what they receive and on which channel? | Your brand and a competitor were cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited | Your brand was cited | Your brand was cited | Your brand and a competitor were cited |
What are the best tools for testing SMS and email sending locally without hitting real phone numbers or sending actual messages? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited |
Which communications API providers give the best visibility into delivery failures, retries, and notification debugging? | A competitor was cited | Neither your brand nor a competitor was cited | Your brand was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited |
Integrations & Ecosystem4/5 cited (80%) | ||||||
What are the best tools for piping delivery and open events from a communications API back into a product analytics pipeline via webhooks? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which communications APIs integrate best with CRMs and marketing automation tools so sales teams can see notification history alongside customer records? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Your brand was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which communications API platforms are designed with portability in mind — making it easy to swap providers for routing and template logic without a full rewrite? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited | A competitor was cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited |
Which communications API platforms have native workplace chat notification channel support for internal alerting alongside customer-facing messages? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited |
Which notification infrastructure platforms integrate with CDPs to drive personalized cross-channel messaging automatically? | Neither your brand nor a competitor was cited | Your brand was cited | A competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited |
Performance & Reliability3/5 cited (60%) | ||||||
Which transactional email API providers deliver the best inbox placement rates and give you the most control over deliverability factors? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited |
Which SMS API providers handle carrier routing and failover best for high delivery rates across different countries? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Your brand was cited | Your brand and a competitor were cited |
Which real-time in-app messaging APIs maintain low latency at 10,000 concurrent connected users? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited |
What tools help load test a notification system to ensure it handles a burst of 1 million emails without queue buildup? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which communications API providers queue and retry in-flight notifications during outages rather than dropping messages? | A competitor was cited | Neither your brand nor a competitor was cited | Your brand was cited | Your brand was cited | Your brand was cited | Your brand and a competitor were cited |
Setup & First Run5/5 cited (100%) | ||||||
Which notification infrastructure platforms support both push and email channels from a single API for mobile apps? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | Your brand was cited | Your brand was cited | Your brand and a competitor were cited |
Which email API providers make switching SPF, DKIM, and DMARC records easiest without disrupting deliverability? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Your brand was cited | Neither your brand nor a competitor was cited | A competitor was cited |
Which SMS API providers make it easiest to migrate sending infrastructure without breaking existing 2FA flows for users? | A competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | A competitor was cited | A competitor was cited | Your brand and a competitor were cited |
I'm evaluating multi-channel notification platforms to architect from the start — which ones scale well as the product grows? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited |
What's the fastest transactional email API to set up for a new SaaS app so that signup and password reset emails reliably hit the inbox? | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Neither your brand nor a competitor was cited | Your brand and a competitor were cited |
Turn this matrix into daily prompt monitoring.
Track prompt changesVertical Ranking
| # | Brand | PresencePres. | Share of VoiceSoV | DocsDocs | BlogBlog | MentionsMent. | Avg PosPos | Sentiment |
|---|---|---|---|---|---|---|---|---|
| 1 | Knock | 22.7% | 17.7% | 5.3% | 16.0% | 30.0% | #24.0 | +0.29 |
| 2 | Twilio | 19.3% | 22.5% | 10.7% | 0.0% | 60.0% | #35.1 | +0.38 |
| 3 | Resend | 11.3% | 6.2% | 0.0% | 10.7% | 14.7% | #17.3 | +0.25 |
| 4 | Vonage | 10.7% | 9.3% | 1.3% | 0.7% | 31.3% | #32.5 | +0.26 |
| 5 | Novu | 9.3% | 12.1% | 5.3% | 0.0% | 28.0% | #46.7 | +0.29 |
| 6 | Stream | 6.0% | 6.5% | 0.0% | 4.7% | 15.3% | #26.1 | +0.37 |
| 7 | Postmark | 6.0% | 8.4% | 1.3% | 4.0% | 24.0% | #37.1 | +0.19 |
| 8 | Mailgun | 6.0% | 7.6% | 0.0% | 3.3% | 0.0% | #40.8 | +0.21 |
| 9 | Plivo | 4.0% | 5.6% | 2.0% | 3.3% | 15.3% | #51.4 | +0.13 |
| 10 | Sinch | 2.7% | 2.5% | 0.0% | 0.7% | 0.0% | #29.3 | +0.24 |
| 11 | Nylas | 1.3% | 0.8% | 0.0% | 0.0% | 0.7% | #4.7 | +0.35 |
| 12 | Bird | 1.3% | 0.8% | 0.7% | 0.0% | 0.0% | #9.3 | +0.72 |
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