Legal
Subprocessors
Last updated August 2026
Callilio Ltd uses the subprocessors below to deliver the service. Each is bound by a data processing agreement. This page is the complete list — there is no separate list available on request.
Current subprocessors
| Subprocessor | What it does | Where it processes |
|---|---|---|
| Supabase | Database, authentication, file storage | United Kingdom (London) |
| Vercel | Web application hosting and serverless functions | United States |
| Fly.io | Real-time voice agent runtime | European Union (Frankfurt) |
| Twilio | Inbound and outbound calls, SMS | United States |
| LiveKit | Real-time call media transport | Global (nearest edge) |
| Deepgram | Speech-to-text — receives raw call audio | United States |
| Cartesia | Text-to-speech (voice output) | United States |
| ElevenLabs | Text-to-speech (alternative voice output) | United States |
| OpenAI | Language model — call and chat transcripts | United States |
| Anthropic | Language model (alternative) | United States |
| Groq | Language model (alternative) | United States |
| Resend | Transactional and marketing email | United States |
| Stripe | Subscription billing and payments | United States / Ireland |
| Sentry | Error monitoring (personal data removed before sending) | European Union (Germany) |
| Vercel Analytics | Aggregated product analytics (loads only with your consent) | United States |
| Calendar integration, maps and geocoding | United States | |
| Microsoft | Calendar integration | United States |
| Firecrawl | Reads the public website of a business during setup | United States |
International transfers
Where a subprocessor processes personal data outside the EEA or the United Kingdom, we rely on the EU Standard Contractual Clauses or the UK International Data Transfer Addendum, together with supplementary measures where required. Transfers from the EEA to the United Kingdom rely on the European Commission's adequacy decision for the UK.
Changes to this list
We update this page before a new subprocessor begins processing personal data. If you want to be told when it changes, write to legal@callilio.com — we will notify you of changes to this list.
Contact
Callilio Ltd, registered in England & Wales, Company No. 17425850. Registered office: 71-75 Shelton Street, Covent Garden, London, WC2H 9JQ, United Kingdom. Questions about this list: legal@callilio.com