OverFlow
Legal
Subprocessors
Third parties that process personal information on our behalf to provide OverFlow, per our Data Processing Agreement. We bind each to service-provider restrictions and will update this page before adding or replacing a subprocessor.
Last updated July 29, 2026
| Subprocessor | Function | Personal information involved |
|---|---|---|
| Supabase | Database hosting and authentication (multi-tenant Postgres) | All stored caller and staff data |
| Vercel | Application hosting / infrastructure | Data in transit; logs |
| Twilio | Inbound voice, call-recording transport, SMS (A2P 10DLC) | Phone numbers, recordings, SMS content |
| Retell | Voice-AI agent orchestration | Audio and transcript (real time) |
| Retell's LLM provider | Large-language-model inference used by the voice agent | Transcript / call content sent for inference |
| Stripe | Payment processing (tokenized cards) | Customer billing data (not caller data) |
| Resend | Transactional email (alerts, receipts, daily digest) | Staff email addresses; lead summaries |
| Expo (Expo Application Services) | Mobile push relay for the OverFlow companion app | Device push tokens; alert content for lead, voicemail, inbound-referral and emergency notifications (caller name, callback number, problem/message summary) |
| Apple Push Notification service | OS-level push delivery to iOS devices | Device push tokens; alert content as above |
| Google Firebase Cloud Messaging | OS-level push delivery to Android devices | Device push tokens; alert content as above |
| Google Maps Platform (Geocoding API) | Geocoding property addresses to coordinates (primary when configured), and interactive map display in the customer dashboard (loads Google scripts and cookies in the signed-in dashboard) | Property address / ZIP |
| OpenStreetMap Nominatim | Geocoding property addresses to coordinates | Property address / ZIP |
Questions? Email admin@overflowvoice.com.