Short verdict
Good fit for
Developers who do not want to build notifications by email, SMS, push and in-app themselves, with a generous free plan.
Less suited to
Anyone who wants data in the EU: Knock stores in the US and expects EU hosting only at the end of 2026.
Key facts
- Free up to 10,000 messages per month
- Data in the US, EU hosting expected end of 2026
- Starter costs $250 per month
What is Knock?
Knock is notification infrastructure from Knock Labs, Inc. in New York (US). Through one API you send notifications to email, SMS, push, Slack and an in-app feed in your own product, with templates, per-user preferences and workflows. For delivery you use your own providers, such as SendGrid, Postmark or Twilio.
According to the privacy statement, data is stored in the US. Knock is covered by the EU-U.S. Data Privacy Framework and uses standard contractual clauses; there is a data processing agreement (Data Processing Addendum). On the security page, Knock writes that it expects EU data residency at the end of 2026. SOC 2 Type 2 applies to all plans.
Good: the free plan with 10,000 messages per month is enough for a small app. No set-up costs.
Less good: the step from free to Starter is big ($250 per month) and prices are in dollars. Data in the EU is not yet possible.
How much does Knock cost?
Starting price
On request
Prices in dollars: Starter $250 per month for 50,000 messages, then $0.005 per message. Free: up to 10,000 messages per month, without a credit card. You pay the costs of your email or SMS provider (such as Postmark or Twilio) there separately.
- ✓ Free plan
- No free trial
- The vendor does not say whether this is excl. VAT
Price alert for Knock
According to the Knock site on . The current plans are on the vendor's site. Has the price changed? Let us know.
The Netherlands check
Useful if you run a business in the Netherlands. "Unknown" means we could not verify it.
Data in the EU: No
An API you build into your product often processes your customers' data. If that data is outside the EU, you have to explain that in your own privacy statement and data processing agreement.
More about data in the EU →Data processing agreement: Yes
If you build an API into your product, the vendor becomes a sub-processor for your customers. Without a data processing agreement you cannot cover that chain.
More about the data processing agreement →Company in the Netherlands: No
A Dutch company falls under Dutch law. For some businesses that matters, for example in a dispute.
Checked on . Something no longer correct? Report an error.
Integrations
According to its own site, Knock integrates with, among others:
- SendGrid
- Postmark
- Twilio
Slack- Segment
- RudderStack
- Hightouch
- Census
Alternatives to Knock
- ZernioFree plan1 of 3 NL checkCompare
- FirecrawlFree plan1 of 3 NL checkCompare
- Context.devFree plan1 of 3 NL checkCompare
- CodeRabbitFree plan1 of 3 NL checkCompare
Knock is based outside the EU. 1 European alternative to Knock
User reviews
No reviews yet. Reviews do not count towards our verdict.
Loading…
Something not right?
We check everything on the Knock site, but prices and terms change. Do you see an error, or are we missing an alternative? You don't need to log in. We check every report ourselves within 5 working days. How we handle corrections.
Report an error
Suggest an alternative
Frequently asked questions about Knock
How much does Knock cost?
Knock has a free plan. Prices in dollars: Starter $250 per month for 50,000 messages, then $0.005 per message. Free: up to 10,000 messages per month, without a credit card. You pay the costs of your email or SMS provider (such as Postmark or Twilio) there separately.
Who is Knock for?
Knock is aimed at freelancers, SMEs and large companies. Notification infrastructure to send email, SMS, push, Slack and in-app messages from your own app through one API.
Does Knock store my data in the EU?
No, Knock does not store your data in the EU. You can sign a data processing agreement.
Does Knock support iDEAL and Peppol?
Knock does not support Peppol.
Which banks and tools does Knock integrate with?
Knock integrates with SendGrid, Postmark, Twilio, Slack, Segment, RudderStack, Hightouch and Census, among others.