Service providers
Last updated: October 27, 2026
These companies help us run Kalon. Each one gets only the information it needs to do its job. We'll update this page before adding a new provider that handles callers' information, and we'll email our clients when we do.
| Company | What it does for us | What it handles |
|---|---|---|
| Retell AI | Voice calling platform: answers the phone, turns speech into text and back, records calls | Call audio, transcripts, phone numbers. Retell's own providers are listed on Retell's trust page. |
| Anthropic | AI model (Claude) behind most of our assistants, and the AI we use to review calls and improve the assistants | The words of the call while it's happening, the business details the assistant needs, and saved transcripts when we review calls |
| OpenAI | AI model behind some of our assistants | The words of the call while it's happening, and the business details the assistant needs |
| Twilio | Phone numbers and text messages | Phone numbers, call routing, and Kalon Alerts text messages (the mobile numbers of people who signed up and the messages sent to them) |
| Railway | Hosting for the software that connects calls to booking systems, and for the client dashboard | Call details and appointment details while they're being handled. For the client dashboard: each client's own call history (call details, transcripts and links to recordings) and the email addresses of the people who can sign in |
| Resend | Sending the one-time sign-in codes for the client dashboard | The email address of the person signing in and the code |
| Cloudflare | Hosting for this website and the questionnaire | Questionnaire answers, text alert sign-ups, basic visit records |
| The client's booking system (for example Phorest or Cal.com) | Looking up openings and booking, moving, or cancelling appointments | Caller names, phone numbers, appointment details |
| Email alerts to business owners, and file storage for some clients' call logs | Call summaries sent to the business owner. For clients who use it, daily call logs stored in Google Drive. | |
| Apple (iCloud) | File storage for our own working copies of call records | Call transcripts and call details we keep to review calls and fix problems |
| Telegram | Instant alerts to business owners, for clients who choose it | Short call summaries sent to the business owner |