APIs · head to head
Svix vs Windmill
Svix
APIs
Outbound webhook sending as a service, with retries, signing and a customer-facing portal
- From
- Free
- Rated
- -
Windmill
Automation Integration
Open-source developer platform for building scripts, workflows, and internal apps
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Svix the Professional tier at 490 US dollars a month includes the same 50,000 messages as the free tier, so the upgrade buys SLA, throughput and retention rather than volume, which is a jarring step for a growing product.; Windmill free self-hosted tier caps SSO users at 10 and workspaces at 3, requiring Enterprise for larger teams.
- They diverge on capability: Svix covers Automatic retries, Windmill covers Script-to-workflow engine.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Svix and Windmill actually diverge.
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Svix
- Automatic retries
- Payload signing
- Consumer portal
- Event types and filtering
- Delivery logs and replay
- Rate limiting
- Static source IPs
- Language SDKs
Only in Windmill
- Script-to-workflow engine
- Auto-generated UIs
- Self-hosted deployment
- Git sync
- SSO support
- Audit logs
What people use each for
The jobs each tool is most often brought in to do.
Svix
- A SaaS company adding webhooks to its API that does not want to build retry, signing and a customer debugging UI from scratchnot Windmill
- A payments or fintech product whose customers need signature verification libraries in several languages they did not writenot Windmill
- An engineering team drowning in support tickets from customers whose endpoints silently failed and who need self-service delivery logsnot Windmill
- A platform with a small number of very slow customer endpoints that must not delay deliveries to everyone elsenot Windmill
Windmill
- Turning ad-hoc scripts into scheduled jobs and APIsnot Svix
- Building internal tools from existing Python/TypeScript codenot Svix
- Self-hosted automation for engineering teamsnot Svix
- Orchestrating multi-language workflowsnot Svix
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Svix
- The Professional tier at 490 US dollars a month includes the same 50,000 messages as the free tier, so the upgrade buys SLA, throughput and retention rather than volume, which is a jarring step for a growing product.
- Only attempted messages count toward usage, but a customer with many subscribed endpoints multiplies a single event into many billable messages, and forecasting that fan-out before launch is difficult.
- The open source server is MIT licensed but trails the hosted product in features, so self-hosting is a fallback position rather than a genuinely equivalent option.
- Routing outbound customer traffic through a third party puts a vendor in the delivery path for events your customers may treat as contractual, which some security reviews will not accept.
- Payload retention is 30 days on the free tier and 90 on Professional, so anyone needing longer delivery history for audit must pay for Enterprise or log independently.
Windmill
- Free self-hosted tier caps SSO users at 10 and workspaces at 3, requiring Enterprise for larger teams.
- Compute unit and seat-based pricing (developer vs. operator seats, worker compute units) adds pricing complexity beyond a flat monthly fee.
- Email triggers are capped at 100/day on the free tier, limiting event-driven use cases without upgrading.
- Smaller ecosystem of pre-built integrations compared to more established automation tools like n8n.
Pricing, plan by plan
Svix
Free- FreeFree
- 50,000 messages a month included
- Overage at $0.0001 per message
- 99.9% uptime SLA
- Professional$490/month
- 50,000 messages included, same as free
- 99.99% uptime SLA
- 800 messages per second
- Enterprise$undefined/year
- Custom volume and rate limits
- 99.999% uptime SLA
- Custom retention
Windmill
Free- Free / Open-sourceFree
- Unlimited executions
- Self-hosted deployment
- Max 10 users with SSO
- Enterprise$120/month
- Unlimited executions and workspaces
- Uncapped SSO seats
- 24/7 priority support (3-hour response)
Which should you pick?
Choose Svix if
- You need automatic retries.
- You want to start without paying.
- You work on Web, Cloud, Docker.
- You also want payload signing.
Choose Windmill if
- You need script-to-workflow engine.
- You want to start without paying.
- You work on web, api, linux, windows, mac.
- You also want auto-generated uis.
Questions people ask
- Is Svix or Windmill better?
- Neither clearly leads. Svix starts at Free and Windmill at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Svix or Windmill?
- Svix starts at Free and Windmill at Free.
- Does Svix or Windmill run on more platforms?
- Svix runs on Web, Cloud, Docker. Windmill runs on web, api, linux, windows, mac.
- Can I use Svix for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Svix best used for?
- Svix is most often used for a saas company adding webhooks to its api that does not want to build retry, signing and a customer debugging ui from scratch, a payments or fintech product whose customers need signature verification libraries in several languages they did not write, an engineering team drowning in support tickets from customers whose endpoints silently failed and who need self-service delivery logs, a platform with a small number of very slow customer endpoints that must not delay deliveries to everyone else. Of those, a saas company adding webhooks to its api that does not want to build retry, signing and a customer debugging ui from scratch and a payments or fintech product whose customers need signature verification libraries in several languages they did not write are not what Windmill is typically brought in for.
- What can Svix do that Windmill cannot?
- Svix covers Automatic retries, Payload signing, Consumer portal, Event types and filtering. Windmill covers Script-to-workflow engine, Auto-generated UIs, Self-hosted deployment, Git sync.
Answered from the vendors’ own pages
Svix: How much does Svix cost?
Free up to 50,000 messages a month; Professional starts at 490 US dollars a month with the same included volume but better SLA and throughput.
Windmill: What does Windmill cost?
Windmill's Free and Open-source edition is $0/month for self-hosted use with unlimited executions, while Enterprise starts at $120/month with unlimited workspaces and uncapped SSO seats, priced further by developer/operator seats and compute units.
SourceSvix: Can I self-host it?
Yes, there is an MIT licensed server, but it lags the hosted service in features and has no SLA.
Windmill: Is there a free plan and what are its limits?
The free self-hosted plan supports unlimited executions but caps SSO at 10 users, workspaces at 3, groups/permissions at 4, and email triggers at 100 per day.
SourceSvix: What counts as a message?
Attempted or transformed deliveries. Retries and messages filtered out because no endpoint subscribed are not charged.
Windmill: How is usage metered on Windmill Enterprise?
Enterprise usage is metered through seats (developer seats at $20/month, operator seats at $10/month) and compute units, e.g. $100/month for 2 standard-worker compute units.
SourceSvix: Does it handle inbound webhooks?
Its focus is outbound sending on behalf of API providers, not receiving webhooks from third parties.
Windmill: What happens to a self-hosted Windmill deployment if the company shuts down?
The pricing page addresses this directly as an FAQ topic, noting that self-hosted applications built on the open-source edition can continue running independently of Windmill the company.
SourceRelated pages
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