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Hook0 vs Svix: catalog facts
Hook0	Svix
Freemium Free hosted plan with no credit card required, plus paid plans.	Freemium Free to start on the hosted service and free to self-host, with paid plans for larger use.
Web, Self-hosted	Web, Self-hosted
Handles retries and HMAC signing of outgoing webhooks Hosted in the EU with a free plan	Automatic retries and delivery monitoring Embeddable portal for customers to manage endpoints
SSPL licence is source-available, not open source Aimed at developers adding webhooks to their own product	For sending webhooks from your own app, not receiving them Some features are aimed at the enterprise hosted plans
Self-hosted, Hosted service	Self-hosted, Hosted service
Closed source	Open source
License: SSPL-1.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.