Knock vs CircleCI
Notifications-as-a-service: in-app feeds, email, push, SMS, chat via one API
vs. Fast, configurable CI/CD with Docker, ARM, GPU runners and orbs
Pricing tiers
Knock
Developer
Free forever. 10K messages, 500 guide users, 500 AI credits/month.
$0 base (usage-based)
Starter
$250/mo. 50K messages, 2.5K guide users, 2K AI credits. Remove branding.
$250/mo
Enterprise
Custom pricing. White-label, i18n, data warehouse, Datadog, SCIM, SAML, HIPAA/BAA.
Custom
CircleCI
Free
$0. 6,000 build minutes/mo (Linux medium). 30 users. Unlimited projects.
Free
Performance
$15/mo (3 users). Credit-based: 80K-240K credits/mo bundles. More concurrency.
$15/mo
Scale
$2,000/mo+ (custom). High concurrency, self-hosted runner support, SSO.
$2000/mo
CircleCI Server
Custom. On-prem deployment of CircleCI. Enterprise only.
Custom
Free-tier quotas head-to-head
Comparing starter on Knock vs free on CircleCI.
| Metric | Knock | CircleCI |
|---|---|---|
| guide users | 2500 users | — |
| guide users overage | $0.05/user USD/user | — |
| messages monthly | 50000 messages/mo | — |
| messages overage | $0.005/message USD/message | — |
Features
Knock · 13 features
- AI Agents — Autonomous notification drafting & workflow generation.
- Batch + Digest — Group notifications into digests on schedule or window.
- Chat — Slack, Microsoft Teams, Discord.
- Email — Send via SendGrid/Postmark/Resend/Mailgun/AWS SES as relays.
- Guides — In-product messaging, announcements, modals, banners.
- i18n / Localization — Translate templates by user locale.
- In-App Feed — Notification inbox with React/Vue/iOS/Android drop-in components.
- Multi-tenancy — Per-tenant branding, preferences, quiet hours.
- Outbound Webhooks — Subscribe to delivery events.
- Preferences — User + tenant preference center with granular controls.
- Push — iOS (APNs), Android (FCM), Expo, Web Push.
- SMS — Twilio, MessageBird, Telnyx, Vonage as providers.
- Workflows — Visual notification orchestration (branch, batch, delay, throttle).
CircleCI · 17 features
- ARM + GPU Runners — ARM64 + T4 GPU resource classes.
- .circleci/config.yml — Single source of truth (YAML 2.1).
- Contexts — Org-scoped shared env vars.
- Deploy Markers — Track deployments + rollback.
- Docker Layer Caching — Reuse Docker layers.
- Dynamic Config — Generate config based on changed paths.
- Manual Approval — Gate workflows with manual step.
- Matrix Jobs — Parameterized parallel jobs.
- Orbs — Packaged reusable jobs + commands.
- Parallelism — Split a job across N parallel containers.
- Rerun with SSH — SSH into failed job.
- Restricted Contexts — RBAC for secrets.
- Scheduled Pipelines — Cron-triggered runs.
- Self-Hosted Runners — On your infra.
- Test Insights — Flaky test detection + trends.
- Test Splitting — By timings, filenames, classnames.
- Workflows (DAG) — Fan out, fan in, conditional.
Developer interfaces
| Kind | Knock | CircleCI |
|---|---|---|
| CLI | Knock CLI | circleci CLI |
| SDK | knockapi (Python), knockapi (Ruby), knock-elixir, knock-go, knock-java, @knocklabs/node, @knocklabs/react | — |
| REST | Knock REST API | CircleCI REST API v2 |
| MCP | Knock MCP Server | — |
| OTHER | Outbound Webhooks | .circleci/config.yml, CircleCI Orbs Registry, CircleCI Webhooks, CircleCI Web UI, Self-Hosted Runner |
Staxly is an independent catalog of developer platforms. Some links to Knock and CircleCI may be affiliate links — Staxly may earn a commission if you sign up through them, at no extra cost to you. Pricing is verified against vendor pages at publication time — reconfirm before buying.
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