Subprocessors
Third-party services that process personal data on our behalf to deliver HelloGuestbook.
Last updated June 9, 2026HelloGuestbook uses the subprocessors below to operate our service. Each provider only receives the data necessary for their role and is bound by data protection obligations consistent with GDPR. For how we handle your information overall, see our Privacy Policy.
| Service | Purpose | Data categories | Location | Policy |
|---|---|---|---|---|
| Vercel | Website hosting, serverless functions | Request logs, performance metrics (browser, country, route) | EU (Stockholm) for compute; global CDN edge; US-based provider (EU-US DPF) | — |
| Supabase | Database hosting, authentication, and file storage | Account data, guestbook content, authentication tokens | EU (EU-North) | — |
| Cloudflare Turnstile | Bot protection on forms | Browser signals, challenge interaction data | Global | Turnstile Privacy Addendum |
| Stripe | Payment processing and subscription management | Billing details, email, subscription status | US (EU-US DPF) | Privacy Policy |
| Resend | Transactional emails | Email address, name, message content | US (SCCs) | — |
| Pirsch Analytics | Cookieless website analytics | Pseudonymous usage data, page views (IP not stored) | EU (Germany) | Privacy Policy |
| Sentry | Error monitoring and performance tracking | Error context, browser/device info, session replay data | US (SCCs) | Privacy Policy |
We may update this list when we add or change subprocessors. Material changes will be reflected here with an updated date.