Hook0 vs Webhook Relay Sending vs Receiving
Webhook Relay brings third-party webhooks into networks that have no public IP. Hook0 delivers your own events to your customers' endpoints. This page shows which direction each tool covers, where they overlap, and when Webhook Relay is the right call.
The Short Answer
Webhook Relay and Hook0 handle opposite ends of the webhook pipe. Webhook Relay is an inbound gateway that receives webhooks from services like GitHub or Stripe, filters and transforms them, and forwards them to localhost, servers behind a firewall, Kubernetes or cloud queues. Hook0 is outbound webhooks-as-a-service. It sends your product's events to your users' endpoints, with per-attempt logs, free retries, HMAC signatures and replay. They meet on local development, where the Hook0 CLI also forwards webhooks to localhost. If you receive webhooks, pick Webhook Relay. If you send them, pick Hook0.
Key Differences
Inbound Gateway or Outbound Delivery
Webhook Relay sits in front of your systems and takes in webhooks that GitHub, Stripe or Shopify send you, then routes them where you need them. Hook0 sits behind your product and publishes its events to every subscriber, so the delivery it manages goes out to your users.
Both Can Reach Localhost
Webhook Relay forwards to localhost and to servers with no public IP through its agent and tunnels. The Hook0 CLI covers the development case with hook0 listen 3000, a WebSocket tunnel to your local port that needs no account and runs through a relay you can host yourself.
EU Publisher, EU Cloud by Default
Hook0 is published by a French company with no US parent, subsidiary or establishment, and its managed cloud runs in the EU by default. Webhook Relay is published by AppScension Ltd, a UK company, and says it runs on Google Cloud; its public pages do not state a data region.
Open Source You Can Run Today
Hook0's server and relay are open source under SSPL-1.0 (source-available, not OSI-approved), and its client SDKs are MIT. You can self-host the whole stack without talking to anyone. Webhook Relay lists a self-hosted option through its sales team.
What Each One Handles
| Feature | Hook0 | Webhook Relay |
|---|---|---|
| Primary role | Outbound webhooks-as-a-service | Inbound webhook gateway and tunnels |
| Webhook direction | Outbound (you send to your users) | Inbound (you receive from third parties) |
| Destinations | Your subscribers' HTTP endpoints | Public URLs, private servers, localhost, Kubernetes, AWS, GCP and Azure services |
| Local development | hook0 listen tunnel, no account |
Tunnels from the Basic plan |
| Transformations | Not offered (payloads are sent as published) | JavaScript and Lua functions, filters |
| Signatures | HMAC-SHA256 on every delivery | Not stated |
| Subscriber portal | Embeddable | Not applicable (not an outbound sender) |
| Free plan | 100 events per day | 150 webhooks per month, no tunnels |
| Publisher | French company, no US entity | AppScension Ltd (UK) |
| Hosting | Managed EU cloud (Clever Cloud FR) + self-host | Google Cloud (region not stated) + self-hosted option via sales |
| Source | Server and relay SSPL-1.0, SDKs MIT | Not stated |
Where Webhook Relay Fits Better
Pick Webhook Relay when your problem is on the receiving side. Typical cases are getting GitHub, Stripe or Shopify webhooks into a CI server or a Kubernetes service with no public IP, reshaping payloads with a function before they land, or fanning one inbound webhook out to several internal targets and cloud queues. Hook0 does not transform inbound traffic, and its tunnel is a development tool.
Common Questions
Is Hook0 an alternative to Webhook Relay?
Only where they overlap. Both can forward webhooks to localhost during development. Beyond that they face opposite directions: Webhook Relay receives and routes the webhooks you get from third parties, and Hook0 delivers the webhooks your product sends to its users.
Can Hook0 forward webhooks to localhost?
Yes, for development. Run hook0 listen 3000 and the CLI prints a public URL on play.hook0.com. Every request sent to it is forwarded to localhost:3000 through a WebSocket tunnel. No account is needed, and you can run your own relay with --relay-url.
Does Hook0 transform or route inbound webhooks?
No. Hook0 is outbound webhooks-as-a-service. It signs, delivers, retries and logs the events you publish. Filtering, transforming and routing webhooks you receive from third parties is what Webhook Relay is built for.
Where is my data hosted?
Hook0 Cloud runs in the EU by default, and Hook0 is published by a French company with no US entity. Webhook Relay states that it runs on Google Cloud, and its public pages do not name a region. Both can be self-hosted, Hook0 from its open-source code and Webhook Relay through its sales team.
Which should I choose, Hook0 or Webhook Relay?
Pick by direction. Sending webhooks to your own customers with signatures, per-attempt logs, free retries and a subscriber portal: Hook0. Receiving webhooks from third-party services and routing them into private networks, CI or cloud queues: Webhook Relay.
Is Hook0 affiliated with Webhook Relay?
No. Webhook Relay is a trademark of its owner. Hook0 is independent and is not affiliated with or endorsed by Webhook Relay. This page is a factual comparison for teams evaluating both.
How we compared, and our sources
This page compares the role, destinations, hosting and public plans of Hook0 and Webhook Relay. Prices and quotas are each vendor's published figures. Company details come from the UK Companies House register.
Sources
- Webhook Relay home page (consulted 2026-10-06)
- Webhook Relay pricing (consulted 2026-10-06)
- AppScension Ltd on Companies House (consulted 2026-10-06)
This is an independent comparison. Hook0 is not affiliated with, endorsed by, or sponsored by Webhook Relay. Product names and trademarks belong to their respective owners, and every competitor figure links to a public source with the date we checked it.
Last reviewed 2026-10-06.
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