Ploi stores your data in the EU, Knock does not. Ploi is a Dutch company, Knock is not. Only Knock integrates with SendGrid, Postmark, Twilio, Slack, Segment, RudderStack, Hightouch and Census. Only Ploi integrates with DigitalOcean, Hetzner, Vultr, AWS EC2, UpCloud, Scaleway and Linode.
Which one do you choose?
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Knock
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.