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Best open-source webhook tools compared

Pick wrong and you'll spend months migrating later. We've been there. Here's what we know about the webhook infrastructure landscape.

Feature comparison​

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

FeatureHook0SvixHookdeckHostedhooks
SaaS (managed)✅✅✅✅
Self-hosting✅ Full feature parity⚠️ Open-core (limited)❌❌
Open-source license✅ SSPL-1.0⚠️ Open-core❌ Proprietary❌ Proprietary
Outbound webhooks✅✅⚠️ Primarily inbound✅
Inbound webhook proxy❌❌✅ Core focus❌
Multi-tenant filtering✅ Label-based⚠️ Basic❌❌
HMAC signatures✅✅✅✅
Automatic retries✅ Fixed schedule + jitter✅✅✅
Dead letter queue✅✅✅❌
Event type hierarchy✅ Dot-notation✅❌⚠️ Flat
Custom retry schedules✅✅✅❌
Delivery logs & replay✅✅✅⚠️ Logs only
REST API✅✅✅✅
SDK supportJS, RustJS, Python, Go, Ruby, JavaJS, Python, Go, RubyJS
AuthenticationBiscuit tokens + Service tokensAPI keysAPI keysAPI keys
Self-funded✅❌ $13M raised❌ $5.5M raisedUnknown

Funding and feature data last verified: January 2025

Detailed comparisons​

  • Svix vs Hook0: Both focus on outbound webhooks. Difference: open-core vs open-source.
  • Hookdeck vs Hook0: Hookdeck is an inbound webhook proxy. Hook0 is an outbound webhook server. Different problems.
  • Hostedhooks vs Hook0: Proprietary vs open-source. Hostedhooks has fewer features but simpler setup.
  • Build vs Buy: What it actually costs to build webhook infrastructure from scratch.
  • AWS EventBridge vs Hook0: Event bus vs dedicated webhook delivery.

What matters if you're a startup​

Time to integrate: Hook0 and Svix both have good APIs. First webhook in under 10 minutes with either. Hookdeck is fast too, but it solves a different problem (receiving webhooks, not sending them).

Cost at scale: Self-hosting Hook0 costs you nothing beyond your own infrastructure. With Svix's open-source version, you get a subset of features. With Hookdeck and Hostedhooks, you pay per message with no self-hosting escape hatch.

Lock-in: Hook0 is SSPL-1.0. You can view, modify, fork, and self-host the code. The only restriction: if you offer Hook0 as a managed service to others, you must open-source your entire stack. For self-hosting your own webhook infrastructure, there are no extra obligations. If we disappeared tomorrow, your webhook infrastructure would keep running.

Open-source options​

Hook0 is the only webhook server where the self-hosted and cloud versions have the same features. Svix is "open-core" -- the open-source version lacks features available in the paid tier.

If you need source access for auditing, compliance, or to avoid vendor dependency, Hook0 is the only real option here.

FAQ​

Which webhook service has the best free tier?​

Hook0 Cloud offers a free tier for development and testing. But the real free tier is self-hosting: run Hook0 on your own infrastructure with zero per-message costs, forever.

Can I migrate from Svix to Hook0?​

Yes. Both use similar REST API patterns. The main work is mapping Svix's "endpoints" to Hook0's "subscriptions" and updating your SDK calls. Most teams complete the migration in a day.

Is Hookdeck a replacement for Hook0?​

No. They solve different problems. Hookdeck is a webhook proxy for receiving and routing inbound webhooks. Hook0 is a webhook server for sending outbound webhooks from your application. Many teams use both.

Do I need a webhook service if I use message queues?​

Message queues (RabbitMQ, Kafka, SQS) handle internal communication. Webhooks handle external communication: delivering events to your customers' HTTP endpoints. They're complementary, not competing.

What is the best open-source webhook management tool?​

Hook0 is the only webhook server where the self-hosted and cloud versions have the same features. Svix is open-core: the open-source version lacks features available in the paid tier. Convoy (Go) handles both inbound and outbound but is VC-funded. For teams that want full source access with no feature gating, Hook0 is the strongest option.

How does pricing compare at scale?​

At 1M events/month: Hook0 Cloud and Svix are in similar price ranges. Hookdeck charges per request. Self-hosting Hook0 eliminates per-message costs entirely. You only pay for compute and storage.

Next steps​