| Hetzner | Website and application hosting | Hosts the Stowspace website and server-side API endpoints and processes the request traffic needed to deliver them. |
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| Supabase | Authentication and database | Account authentication, profiles, consent and audit records, sync metadata, and user-scoped application records. |
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| Google | Optional identity provider | Authenticates users who choose Google sign-in and supplies identity details to Supabase Auth. |
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| Cloudflare | R2 object storage | Private article HTML, thumbnails, video blobs, and related synced file content. |
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| Cloudflare | Turnstile | Bot and abuse checks on selected authentication and account forms. |
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| Upstash | Redis | Short-lived rate-limit keys, counters, and expiry data used to protect public and authenticated endpoints. |
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| OpenRouter | AI routing | Routes the text and instructions for an AI action started by the user to the selected model provider. |
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| Selected AI model provider | AI inference | Processes the relevant text and instructions for the requested summary, key points, or tag suggestion. |
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| Polar | Merchant of record | Checkout, payment collection, taxes, invoices, refunds, subscription administration, and the customer billing portal. |
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| Sentry | Error reporting | Processes account-unlinked, sanitized website errors and optional desktop, mobile, and extension error events when enabled by the user on those clients. |
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| GitHub | Desktop release distribution | Hosts public desktop release metadata and installer downloads used by update checks. |
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