Svix and HookWatch both have “webhooks” at the centre, which is enough to get them compared — but they sit on opposite ends of the arrow. Svix is primarily about the sending side: infrastructure a platform uses to deliver webhooks to its own customers. HookWatch is about the receiving side: capturing, monitoring, and recovering the webhooks your team receives from providers. That single distinction explains almost everything else on this page, including why many teams end up wanting both.
Which direction does the arrow point
Every webhook has a sender and a receiver, and tooling tends to specialise in one:
- Sending side. You run a platform — a payments API, a SaaS product, a developer tool — and your customers want to be notified when things happen in it. You need to deliver webhooks to thousands of customer endpoints reliably, with signing, retries, and a way for your customers to manage their own endpoints. This is the problem Svix is primarily built for: outbound webhook infrastructure you put in front of your product’s events.
- Receiving side. You consume webhooks from providers like Stripe, GitHub, or Shopify, and you need to capture what arrives, know when a delivery fails, and re-run events after a fix. This is the problem HookWatch is built for.
They are not competing implementations of the same thing. They are tools for the two ends of the same wire.
What Svix addresses
Svix is, at its core, webhook-sending infrastructure as a service, aimed at platforms that need to send webhooks to their customers, plus the related tooling around that job — endpoint management for your customers, signing so your customers can verify the events came from you, and reliable outbound delivery at scale. If you are the one emitting events for others to consume, that is the side of the problem you have.
HookWatch does not do this. HookWatch is a receiving-side tool; it is not infrastructure for sending your own product’s outbound webhooks to your customers. If your need is “my platform must reliably deliver events to my users”, a sending-side product is what you are looking for, and HookWatch is not it.
What HookWatch addresses
HookWatch is for the team on the receiving end of someone else’s webhooks. Point an endpoint at it and every delivery is recorded in full — request headers and body, response status and body, and a numbered attempt history. Failures get a per-delivery analysis; repeated failures on an endpoint are grouped into an incident; alert rules can notify a Slack channel or an outbound webhook when failures spike. Retries are opt-in per endpoint with jittered backoff, and replay re-sends the exact captured payload — one at a time or in bulk — after you have deployed a fix.
Verifying that an inbound webhook genuinely came from the provider lives here too: HookWatch can check inbound signatures using its own HMAC-SHA256 scheme or a custom scheme matching your provider’s header, algorithm, and encoding. If your need is “I receive webhooks and I need to see, trust, and recover them”, that is the side HookWatch is built for. The general technique is covered in how to verify webhook signatures.
Side by side
| Dimension | Svix (sending emphasis) | HookWatch (receiving emphasis) |
|---|---|---|
| Side of the flow | Sending webhooks to your customers | Receiving webhooks from providers |
| Typical user | A platform emitting events for its users | A team consuming events from third parties |
| Endpoint management | Your customers’ endpoints, managed for them | Your own endpoints receiving inbound traffic |
| Signing / verification | Signs outbound events so customers can verify them | Verifies inbound signatures from providers |
| Reliability focus | Reliable outbound delivery at scale | Retry of retryable failures, plus replay of captured payloads |
| Debugging focus | Your customers’ delivery experience | Your own capture, failure analysis, and incidents |
The table is not a scorecard — nearly every row is “different job”, not “better or worse”. A tool that signs and delivers your outbound events is not trying to do what a tool that captures and recovers your inbound events does.
Which side am I on? A quick diagnostic
If the sending-versus-receiving distinction feels abstract, three questions settle it:
- Who owns the event? If the event happened in your system and someone else needs to hear about it, you are sending. If the event happened in someone else’s system and you need to hear about it, you are receiving.
- Who manages the endpoint? If your customers register URLs with you and you deliver to them, that is the sending side. If you register a URL with a provider and they deliver to you, that is the receiving side.
- Which signature are you handling? If you are producing a signature so others can verify events came from you, that is sending. If you are verifying a signature to trust an event came from a provider, that is receiving — the job covered in how to verify webhook signatures.
Answer those and the tool category follows. It is common to answer “sending” for one part of your system and “receiving” for another, which is exactly why the two sit side by side rather than in competition.
A both-at-once example
Consider a SaaS product that integrates a payment provider. It has webhooks going in both directions at once:
- Outbound. When a subscription changes, the product notifies its own customers’ systems. That is a sending-side job — reliable delivery to many customer endpoints, with signing so those customers can verify the events. A sending-side product such as Svix is built for this half.
- Inbound. The payment provider sends the product webhooks about charges and disputes. Those need capturing, monitoring, and recovering when a delivery fails. That is a receiving-side job, and it is where HookWatch fits — full capture, incidents, and replay of the exact payload after a fix.
Neither half makes the other redundant. The same team can run a sending-side tool for the events it emits and a receiving-side tool for the events it consumes, and the two never touch the same wire.
Why they often coexist
Because the two sides are independent, the same company frequently needs both, without any conflict:
- Your platform sends webhooks to your customers — a sending-side concern, where something like Svix fits.
- Your platform also receives webhooks from the providers you integrate — a payment processor, a source-control host, a shipping API — and those need capturing, monitoring, and recovering, which is where HookWatch fits.
Choosing between them only makes sense if you have genuinely mistaken one problem for the other. If you are emitting events, look at sending-side infrastructure. If you are consuming them and want visibility and recovery when they fail, that is the receiving-side problem HookWatch is for — and the same retry principles matter on both ends of the wire, even though the tooling for each end is different. Work out which direction your arrow points first; the choice follows from that.