Subprocessors
The full list of third parties Horizon uses to deliver Steward. We do not add a subprocessor without updating this page. If you want to be notified of changes, tell us at /talk-to-us.
Last updated: .
Current subprocessors
| Subprocessor | Purpose | Location |
|---|---|---|
| AWS | Compute, database, object storage, secrets management for the Steward application. | United States (us-east-2) |
| Cloudflare | DNS for the product domain. Static hosting for this marketing site. Cookieless analytics on this site only — no in-product tracking. | Global edge |
| Postmark | Transactional email delivery (login links, digest emails to reps). No marketing email — Steward does not send to mailing lists. | United States |
Inference
Steward's language model runs on infrastructure we operate directly. There is no third-party inference vendor. See Security & DFR posture.
How we add a subprocessor
- We do not add a subprocessor without updating this page.
- For locals with an executed deployment agreement that requires notice, we notify the primary contact before the change takes effect.
- If a subprocessor is added in response to an incident, we notify immediately rather than waiting.