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Svix vs Hook0

Svix is a webhook service backed by $13M in VC funding. Svix and Hook0 both focus on outbound webhook delivery. The difference: Svix is open-core (the self-hosted version has fewer features), Hook0 has the same features in cloud and self-hosted.

Legend: ✅ = Full support | ⚠️ = Partial support | ❌ = Not available

Feature comparison​

FeatureSvixHook0
SaaS✅✅
Self-hosting⚠️ Open-core (limited features)✅ Full feature parity
Open-Source⚠️ Open-core✅ SSPL-1.0
Multi-tenant filtering⚠️ Basic filtering✅ Label-based filtering
HMAC signatures✅✅
Automatic retries✅✅ Fixed schedule + jitter
Dead letter queue✅✅
Event type hierarchy✅✅ Dot-notation
Custom retry schedules✅✅
Delivery logs✅✅
Manual replay✅✅
REST API✅✅
SDK languagesJS, Python, Go, Ruby, Java, Kotlin, C#JS, Rust
Authentication modelAPI keysAPI keys and Biscuit tokens with attenuation
Self-funded❌ $13M raised✅ Fully self-funded

Funding data last verified: January 2025

Pick Hook0 if...​

  • You need full self-hosting. Hook0's self-hosted version has every feature the cloud version has. Svix's open-source version strips out features to push you toward their paid tier.
  • You want actual open-source. SSPL-1.0 means you can audit every line, fork it, and self-host. The only restriction is offering Hook0 as a managed service to third parties. No feature gates, no "contact sales for enterprise features."
  • Multi-tenant filtering matters. Hook0's label-based filtering works for SaaS platforms where different tenants need different webhook routing rules.
  • You're self-funded or cost-conscious. Self-host Hook0 with zero per-message costs. You own the infrastructure.

Pick Svix if...​

  • You need SDKs in many languages. Svix has official SDKs for Python, Go, Ruby, Java, Kotlin, and C#. Hook0 currently supports JavaScript and Rust.
  • You want a larger ecosystem. Svix has been around longer and has more third-party integrations and community content.
  • The open-core trade-off works for you. If you'll use the cloud version anyway and don't plan to self-host, Svix's feature limitations in the open-source version won't affect you.

Architecture differences​

Svix and Hook0 use the same high-level architecture: API server, queue, workers, delivery. The implementation differs:

  • Svix uses Redis for queuing and PostgreSQL for storage. The open-source version supports Redis and PostgreSQL.
  • Hook0 supports two queue backends. The default setup uses PostgreSQL for both queuing and storage -- one database, nothing else to manage. Workers poll for pending deliveries using FOR UPDATE SKIP LOCKED for concurrent processing. For high-throughput setups, you can switch to Apache Pulsar for queuing with S3-compatible object storage for payloads and responses. It's a config change, not a code change.

Migration path​

Moving from Svix to Hook0:

  1. Map Svix "endpoints" to Hook0 "subscriptions"
  2. Map Svix "event types" to Hook0 event types (both use dot-notation)
  3. Update SDK calls (API patterns are similar)
  4. Migrate endpoint URLs and secrets

Most teams finish the API integration in under a day, then spend a few days on testing and validation.

Further reading​