Buildkite
Buildkite is forcing a major agent upgrade and handing agents a shortcut through failures.
Comparison · Infra & APIs
Clerk vs Knock
A side-by-side editorial comparison of Clerk and Knock — release velocity, themes, recent moves, and the top alternatives to consider.
Clerk vs Knock: at a glance
| Feature | Clerk | Knock |
|---|---|---|
| Sector | Infra & APIs | Infra & APIs |
| Velocity score | 0.0 | 6.3 |
| Sparks · 30d | 0 | 1 |
| Top themes | authentication, machine-auth, agent-tooling, scim | notifications, workflow-orchestration, developer-experience, agent-native |
| Last editorial update | 2h ago | 1h ago |
| Website | Visit → | — |
What is Clerk?
Clerk is building auth for machines: API keys, a CLI agents can drive, per-verification pricing.
Two threads dominate. The first is machine authentication: API keys reached general availability with usage-based billing at $0.001 per creation and $0.00001 per verification, and a new CLI is described as a tool for developers and their agents to manage auth and billing. The second is enterprise readiness — Directory Sync (SCIM) generally available with custom attribute mapping and IdP role assignment, plus an Application Logs event stream across auth, billing, and organizations. Dashboard polish and Expo theming fill in around them.
What is Knock?
Notification infrastructure grows a memory: workflows can now wait on the real world.
Knock sells notification infrastructure — workflows, broadcasts, in-app guides, and multi-channel delivery that product teams wire up instead of building themselves. July was dense and unusually broad: a rebuilt Notion-style template editor, saved views and tags, schema management for how properties surface across the dashboard, passkey login, branch rebasing, and sandbox test runs that skip delay steps. Underneath the polish, two structural additions landed — message events syncing into the data warehouse, and a workflow step that pauses until an event arrives.
Clerk vs Knock: editorial side-by-side
Clerk
0.0INFRA · APIS
Clerk is building auth for machines: API keys, a CLI agents can drive, per-verification pricing.
◆ Current state
Two threads dominate. The first is machine authentication: API keys reached general availability with usage-based billing at $0.001 per creation and $0.00001 per verification, and a new CLI is described as a tool for developers and their agents to manage auth and billing. The second is enterprise readiness — Directory Sync (SCIM) generally available with custom attribute mapping and IdP role assignment, plus an Application Logs event stream across auth, billing, and organizations. Dashboard polish and Expo theming fill in around them.
◆ Where it's heading
Clerk is extending from human sign-in toward credentials for software acting on a user's behalf, and pricing that surface by the call rather than by the seat. The CLI framing makes the direction explicit: the control plane should be operable by an agent, not only by a person in a dashboard. Meanwhile SCIM, logs, and billing controls are the enterprise checklist that lets it sell upmarket while that bet plays out.
◆ Prediction
Expect the machine authentication suite to deepen around delegated and scoped access for agents — finer-grained key permissions or short-lived credentials — with usage-based pricing extended to whatever ships next.
Knock
6.3INFRA · APIS
Notification infrastructure grows a memory: workflows can now wait on the real world.
◆ Current state
Knock sells notification infrastructure — workflows, broadcasts, in-app guides, and multi-channel delivery that product teams wire up instead of building themselves. July was dense and unusually broad: a rebuilt Notion-style template editor, saved views and tags, schema management for how properties surface across the dashboard, passkey login, branch rebasing, and sandbox test runs that skip delay steps. Underneath the polish, two structural additions landed — message events syncing into the data warehouse, and a workflow step that pauses until an event arrives.
◆ Where it's heading
The developer-workflow half of the product is being treated like a codebase: branches that rebase onto main, tests that run in sandbox without delivering, tags and saved views for navigating a growing workspace. The engine half is moving in a different direction — toward workflows that hold state over time. A wait-for-event step, combined with the Clay data source triggering messaging as rows finish enriching, describes journeys rather than notifications. The analytics work is arriving twice over: raw events into the warehouse for teams with their own stack, and natural-language questions to the Knock agent for teams without one.
◆ Prediction
Wait-for-event is the primitive that makes journey-shaped use cases possible, so expect the next releases to address what it exposes — timeouts, observability into workflows sitting paused, and limits on how long one can wait before it becomes a support problem.
Alternatives to Clerk and Knock
Other Infra & APIs products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either Clerk or Knock.
Statsig
Statsig is packaging its own workflows as skills for someone else's agent to run.
Rootly
Rootly's AI stops summarizing incidents and starts investigating them.
WorkOS
Auth infrastructure that agents can drive and developers can run locally.
Expo
Expo shut down its own coding agent and kept the MCP server — it wants to be the substrate.
Airbyte
Airbyte 2.0 made the pipeline run both ways: data activation turns the warehouse into a source.
Recent activity from Clerk and Knock
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 23h agoKnockAnalytics in the Knock agent
- 1d agoKnockWait for event function ⚡
- 2d agoKnockClay data source
- 7d agoKnockRedesigned template editor
- 14d agoKnockBranch rebasing
- 16d agoKnockPasskey authentication
- 2mo agoClerkImproved observability with Application Logs
- 3mo agoClerkClerk CLI ⚡
- 3mo agoClerkClerk homepage captured as a changelog entry
- 3mo agoClerkAPI keys reach GA with usage-based billing active
- 3mo agoClerkAPI Keys General Availability
- 3mo agoClerkTheme Expo native components from a JSON fileCategorySDKPublishedApr 16@clerk/expo now supports a JSON-based theme for native iOS and And…
Frequently asked questions
What is the difference between Clerk and Knock?
They serve adjacent needs but don't currently overlap on shipped themes. Knock is currently shipping more aggressively (velocity 6.3 vs 0.0), with 1 editorial sparks in the last 30 days against 0. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Clerk better than Knock?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Knock is currently shipping more aggressively (velocity 6.3 vs 0.0), with 1 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other Infra & APIs products to evaluate alongside.
What are the best alternatives to Clerk?
Top Clerk alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "Clerk alternatives" section above for the current picks, or visit /alternatives/clerk for the full list with editorial commentary on each.
What are the best alternatives to Knock?
Top Knock alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "Knock alternatives" section above for the current picks, or visit /alternatives/knock for the full list with editorial commentary on each.