Best Open-Source Webhook Server
Hook0 is fully open-source under SSPL; audit every line of code, self-host for compliance, or use Hook0 Cloud for managed infrastructure, automatic updates, and EU hosting. Bootstrapped, no open-core tricks.
Why Your Webhook Server Should Be Open-Source
Audit Every Line of Code
Webhooks carry sensitive payloads. With open-source, your security team can audit exactly how data is handled, signed, and delivered. No black boxes.
No Vendor Lock-in
If the vendor disappears, raises prices, or pivots, you still have the code. Fork it, maintain it, or migrate at your own pace. Your webhook infrastructure is yours.
Self-Host Anywhere
Deploy on your own servers, your own cloud, or air-gapped networks. Open-source means you choose where your data lives, not the vendor.
Community & Contributions
Report bugs, send PRs, request features. Open-source projects align incentives: the product gets better because users can shape it directly.
Webhook Licensing Models Compared
| Criteria | SSPL (Hook0) | Open-Core (Svix) | MIT (Convoy) | Proprietary (Hookdeck) |
|---|---|---|---|---|
| Source code available | Yes, 100% on GitHub & GitLab | Partial (core only) | Yes, on GitHub | No |
| Can audit code | Every line, including infra | Core only, enterprise is closed | Yes | No |
| Can self-host | Yes, free (Docker / K8s) | Enterprise plan only | Yes, free | No |
| Feature parity (cloud = self-host) | Same codebase, all features | Different editions, features gated | Cloud is a separate product | N/A (cloud-only) |
| Vendor lock-in risk | Low; fork anytime, standard PostgreSQL | Medium; enterprise features lost if you leave | Low; MIT allows forking | High; no source, no self-host |
| Data sovereignty | Full control (self-host or EU Cloud) | US cloud or enterprise self-host | Self-host only | US cloud, no self-host option |
| Community contributions | PRs welcome on full codebase | PRs on core only | PRs welcome | No community access |
| License restrictions | Cannot resell as managed service | Enterprise features require paid license | None (permissive) | All usage subject to vendor terms |
What Sets Hook0 Apart
Audit Every Line
Webhooks carry sensitive payloads. Your security and compliance teams can review the entire codebase; API, worker, database schema; before deploying to production. No closed-source black boxes.
No Vendor Lock-in
Migrate anytime. No proprietary APIs, no proprietary data formats. Hook0 stores everything in standard PostgreSQL. If you leave, your data and infrastructure knowledge come with you.
Cloud When You Want It
Start with Hook0 Cloud for the fastest path to production. Switch to self-host later for compliance or data sovereignty; or the other way around. Same codebase, zero migration effort.
Common Questions
Is Hook0 open-source?
Yes. Hook0 is fully open-source under the SSPL-1.0 license. Every line of code is on GitHub and GitLab. There is no proprietary enterprise edition.
What license does Hook0 use?
SSPL-1.0 (Server Side Public License). You can freely self-host, modify, and audit the code. The only restriction is offering Hook0 as a managed service to third parties without open-sourcing your stack.
What does self-hosting Hook0 require?
Self-hosting Hook0 requires Docker Compose or Kubernetes and a PostgreSQL database. You manage your own infrastructure, scaling, backups, updates, and monitoring. The self-hosted binary is built from the same codebase as Hook0 Cloud; no features are stripped out. Hook0 Cloud handles all of that for you if you prefer a managed path.
What are the risks of open-core webhook tools?
Open-core webhook tools split their codebase into a free community edition and a paid enterprise edition. The risk: features you rely on today (SSO, advanced monitoring, self-hosting support) can be moved behind the paywall at any time. You cannot audit the closed-source parts for security. And if you self-host, you run a stripped-down version. Hook0 avoids this; the full codebase is available under SSPL, with no enterprise edition.
Is Hook0 really free to self-host?
Yes. Hook0 is open-source and self-hostable at no license cost. Hook0 Cloud adds managed infrastructure, automatic updates, EU hosting, priority support, and SLA; so you can focus on your product instead of operating webhook infrastructure. Start with the free cloud tier (100 events/day, no credit card).
Is there an open-source webhook platform that is also EU-hosted?
Yes. Hook0 is open-source under SSPL-1.0, and Hook0 Cloud runs its data plane on Clever Cloud in France (inside the EU) on every plan. Many EU-hosted webhook services are closed-source and cloud-only, so you cannot read the code or run it yourself. With Hook0 you can audit the code, self-host it, or use the EU cloud; the CDN in front of the cloud is Cloudflare (US), disclosed in our public sub-processor list.
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