Price, integrations and Netherlands check side by side.
for freelancers and SMEs and large companies
Notification infrastructure to send email, SMS, push, Slack and in-app messages from your own app through one API.
Free planfor freelancers and SMEs and large companies
One API to post, schedule and analyse on Instagram, TikTok, LinkedIn, YouTube and other social channels.
Free plan| Knock | Zernio | |
|---|---|---|
| Price | Free plan | Free plan |
| Data in the EU | ✕ No | ✕ No |
| Data processing agreement | ✓ Yes | ✓ Yes |
| Company in the Netherlands | ✕ No | ✕ No |
| Integrations | SendGrid, Postmark, Twilio, Slack, Segment, RudderStack, Hightouch, Census | Instagram, Facebook, X, TikTok, YouTube, LinkedIn, Pinterest, Threads, Bluesky, WhatsApp, Google Business Profile, MCP |
| Free trial | None | None |
| Stackwijs verdict | No verdict yet | No verdict yet |
| User reviews | No reviews yet | No reviews yet |
| For whom | freelancers, SMEs, large companies | freelancers, SMEs, large companies |
Facts checked on the vendors' websites.
Only Knock integrates with SendGrid, Postmark, Twilio, Slack, Segment, RudderStack, Hightouch and Census. Only Zernio integrates with Instagram, Facebook, X, TikTok, YouTube, LinkedIn, Pinterest, Threads, Bluesky, WhatsApp, Google Business Profile and MCP.
We sometimes earn from a click. That does not change the order. How we make money
Notification infrastructure to send email, SMS, push, Slack and in-app messages from your own app through one API.
Suits developers who do not want to build notifications by email, SMS, push and in-app themselves, with a generous free plan.
On the Knock website
One API to post, schedule and analyse on Instagram, TikTok, LinkedIn, YouTube and other social channels.
Suits developers and agencies who want to build posting to many social channels into their own app or AI agent.
On the Zernio website
You get Knock or Zernio with the differences in a one-off email. We don't store your address for this.
We get a fee if you take out a subscription through us. That does not change our verdict.
