Knock vs. Inflection
Unlock customer engagement that runs itself
Modern teams choose Knock to launch messaging flows with a prompt. Set your goals, and Knock agents identify, build, and ship the customer journeys to hit them.
Top reasons teams choose Knock over Inflection
Learn why companies reach for Knock when looking for Inflection alternatives.
Agentic customer engagement
Knock is built for agents to do the work. Build complex customer journeys with a prompt, generate on-brand templates, and manage all your messaging from Claude, Slack, or the terminal.
One system for all messaging
Manage your product, marketing, and transactional messaging from one place. Send messages across email, in-app, SMS, push, and chat, triggered from API calls, events, or audience changes.
Native in-app messaging
Show in-app banners, modals, and cards that use your own UI components. Guides share audiences and analytics with broadcasts and workflows, so in-app nudges can be coordinated with other messaging in one system.
Advanced sending controls
Apply batching, digests, throttling, and idempotency to lifecycle messaging and product notifications. Send timely messaging without fear of notification overload. No custom logic needed.
Infrastructure-grade reliability
Knock's messaging infrastructure powers billions of notifications in production for world-class organizations like Vercel, Webflow, and Zapier, with 99.99% uptime, git-style versioning, and full observability.
Usage-based pricing
Connect providers you already use, such as Amazon SES and Twilio, and only pay for the messages you send. Every plan gives you unlimited contacts, team members, workflows, and channels on every plan, with no hidden costs.
Ship coordinated, cross-channel messaging
Coordinate in-app and out-of-app flows that reach the right users at the right moments. Send dynamic, on-brand messages across email, in-app, push, SMS, and chat.
The New user onboarding workflow in the builder, at Collab.io. An agent step is dragged in from Add a step under the new-user-signup trigger and its prompt is typed: Claude Sonnet 5 writes a welcome line for the recipient that fits their role, into a welcome_line response property. The welcome email greets the recipient by first name, then uses that line. After a 3 day delay, a branch on Created a project? sends a Day 3 tips email to people who have not created one yet and an in-app feed message to everyone else.
Trigger smart automations that send messages across any channel.
email / in-app / push / SMS / chat
Unify product, CDP, and warehouse data
Sync data and events from your product, CDP, warehouse, and connected tools to build dynamic audiences and trigger messaging based on any attribute or signal.
Product usage from the Knock SDKs, traits from a CDP such as PostHog, Segment, or Amplitude, account data synced by Hightouch from a warehouse such as Snowflake, Databricks, or BigQuery, and billing data from Stripe flow into one user model in Knock as user properties.
A dynamic audience updates as those properties change, and a user entering the audience triggers a workflow.
Knock vs. Inflection feature comparison
| Feature | Knock | Inflection |
|---|---|---|
| Lifecycle and marketing | ||
| One-time and recurring broadcasts to audiences | Yes (broadcasts, sent from the dashboard) | Yes (campaigns) |
| Dynamic audiences built from user properties and events | Yes, reusable across workflows, broadcasts, and guides | Yes (segments) |
| Multi-step lifecycle journeys (onboarding, activation, win-back) | Yes (workflows with branching, delays, and AI agent steps) | Yes (email journeys) |
| Workflow and broadcast analytics | Yes | Yes |
| Goals with conversion attribution | Yes | Campaign reporting |
| In-app messages, banners, and nudges in your own components | Yes (guides) | No |
| Drag-and-drop email editor for non-technical users | Yes | Yes |
| Self-serve copy and targeting edits without a deploy | Yes | Yes |
| One system for every message | ||
| Product, lifecycle, and transactional messaging in one platform | Yes | Focused on email marketing |
| Email, SMS, push, in-app, Slack, Microsoft Teams, and WhatsApp | Yes, native | Email, with webhooks for other channels |
| Bring your own providers (25+, such as Amazon SES and Twilio) | Yes | Inflection email sending, plus webhooks |
| Batching, digests, throttling, and idempotency | Yes, built in | Campaign sending limits |
| Cross-channel user preference center | Yes | Yes |
| Multi-tenancy | Yes | Separate accounts |
| Reliability and control | ||
| Delivery logs with downstream provider responses | Yes | Campaign activity logs |
| Git-style versioning and multiple environments | Yes | Campaign edit history |
| CLI, Management API, and MCP server | Yes | REST API |
| 99.99% uptime | Yes | Contact Inflection for SLA details |
Frequently asked questions
Knock and Inflection both run lifecycle marketing: broadcasts, audience targeting, multi-step journeys, and campaign analytics. The difference is that Knock runs those campaigns on the same platform that sends your product and transactional messages, so marketing, product, and engineering work from one set of audiences, templates, preferences, and delivery logs. Inflection focuses on email marketing, so many teams run a separate system for product and cross-channel notifications.
Yes. Marketing and growth teams use Knock broadcasts to send one-time and recurring campaigns to dynamic audiences, workflows to run onboarding, activation, and win-back journeys, and guides to show in-app announcements and nudges. Broadcasts can chain channels, for example an in-app message followed by an email if the user doesn't engage, and can reference tenant data such as a customer's current plan. Workflow and broadcast analytics and goals with attribution show which campaigns drive conversions.
Yes. While getting Knock connected to your messaging providers, data warehouse, and other third-party integrations may require some technical involvement, non-technical users can create messaging workflows, manage notification templates, edit and send one-time messages, ship in-app messaging, and view analytics without developer involvement.
Yes. Knock covers the lifecycle campaigns teams run in Inflection, including one-time and recurring broadcasts, dynamic audiences, and multi-step journeys, and it also sends product and transactional messages. Marketing, product, and engineering share one set of audiences, templates, preferences, and delivery logs.
Both provide campaign engagement analytics. Knock reports opens, clicks, impressions, and dismissals across workflows and broadcasts, tracks goals with attribution, and streams data to your warehouse. Knock also adds end-to-end delivery observability, so any team can see why a specific message did or didn't reach a user, including the provider's response.
You can, and some teams start that way while migrating. Running two systems means duplicate audiences, inconsistent templates, separate preference settings, and two bills. Because Knock handles lifecycle, product, and transactional messaging, most teams consolidate onto Knock once their campaigns are moved.
Inflection can send transactional email. Knock applies transactional primitives such as batching, digests, and idempotency across its workflow engine, alongside in-app messaging, delivery logs, versioning, and multiple environments.
Knock sends billions of messages in production for companies such as Vercel, Webflow, and Zapier with 99.99% uptime, and handles both scheduled campaigns and real-time, event-driven messages on the same infrastructure.
Inflection supports email, and reaches other channels through webhooks. Knock supports email, SMS, push, and in-app, plus native Slack, Microsoft Teams, and WhatsApp, and webhooks for custom channels. You can connect 25+ providers, for example Amazon SES for email or Twilio for SMS in 180+ countries, and switch providers without rebuilding campaigns.
Knock has transparent usage-based pricing that starts at $0 for the first 10,000 messages, with volume discounts for larger companies. All plans include unlimited data ingestion and unlimited channels with no onboarding or service fees; you pay for messages sent. Inflection prices by contacts and plan.
Knock holds SOC 2 Type 2 certification and supports GDPR and CCPA requirements on every plan.
Most teams migrate in 2 to 4 weeks, depending on how many campaigns and workflows they run. Knock's support team helps with both campaign and workflow moves.