A polished app you can actually program.
OpenPhone is a polished but closed app. VanceTel delivers the same finished softphone and shared inbox — then adds a real REST API, HMAC-signed webhooks, deep links and an MCP server, so the phone system becomes part of your software.
curl https://api.netexem.com/v1/webhook_endpoints \
-H "Authorization: Bearer $NETEXEM_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"url": "https://app.example.com/hooks/netexem",
"events": ["message.received", "call.completed"]
}'
# Every event is HMAC-SHA256 signed, so your endpoint can
# verify it came from us before acting on it.The same app — with a developer surface behind it.
OpenPhone vs VanceTel.
Both are finished apps. The difference is how far you can drive them from your own code. A fair, factual read.
| Capability | OpenPhone | VanceTel |
|---|---|---|
| Polished softphone app | Yes | Yes — iPhone, iPad, Mac, Vision Pro, desktop, web |
| Two-way SMS in a shared inbox | Yes | Yes |
| Production REST API | Limited public surface | Yes — send/receive SMS, calls, contacts |
| HMAC-signed webhooks | Limited | Yes — HMAC-SHA256 signed events |
| Deep links (pre-addressed call / text) | Not exposed for developers | Yes — pre-fills the recipient |
| MCP server for AI agents | Not provided | Yes — agents and Claude Code act in the loop |
| Website chat → two-way SMS | Not provided | Drop-in snippet |
| Drive from your own software | Mostly through the app UI | Yes — API, webhooks and deep links |
Capabilities and APIs change over time — check current docs for the latest on either platform.
The app, opened up.
OpenPhone is well built for teams who live inside the app. VanceTel is for teams who also want to wire the phone system into their CRM, their automations and their agents. Four developer surfaces make that possible.
A real REST API
Send and receive SMS/MMS, place click-to-call, create contacts and react to call events from your own code. The public API is write-and-event oriented — create, send and subscribe.
Signed webhooks
Subscribe to inbound messages, delivery receipts and call events. Every payload is HMAC-SHA256 signed so your endpoint can trust it before it acts.
Deep links
Open the softphone to a call or a pre-addressed text from any button, CRM record or dashboard. The deep link pre-fills the recipient — you keep control of the message.
An MCP server
Let AI agents and Claude Code act on the phone system in the loop — send a text, resolve a contact, check a message's status — without leaving their workflow.
OpenPhone comparison questions.
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How is VanceTel different from OpenPhone?
OpenPhone is a polished business phone app, and it is good at being an app. VanceTel delivers the same kind of finished softphone and shared SMS inbox, but adds a real developer surface on top: a production REST API, HMAC-SHA256 signed webhooks, deep links and an MCP server. The practical difference is that you can program VanceTel from your own software, while OpenPhone is used mostly through its app.
Does VanceTel have an API and webhooks?
Yes. VanceTel exposes a production REST API for sending and receiving SMS and MMS, placing click-to-call and creating contacts, plus HMAC-SHA256 signed webhooks for inbound messages, delivery receipts and call events. The public API is write-and-event oriented — create, send and subscribe — rather than a full read-CRUD surface.
Do I lose the polished app if I want programmability?
No. That is the point. VanceTel keeps the finished softphone — on iPhone, iPad, Mac, Apple Vision Pro, desktop and web — and the shared inbox your team works in. The API, webhooks, deep links and MCP server sit underneath the same app, so adding automation does not mean giving up the product.
What can the MCP server do?
The VanceTel MCP server lets AI agents and Claude Code act on your phone system in the loop — send a text, resolve a contact, or check a message's status — alongside the REST API and webhooks. It turns the phone system into something an agent can operate, not just a screen a person clicks.
Keep the polish. Add the API.
See the finished VanceTel softphone and the REST API, webhooks and MCP server that open it up — in one 20-minute walkthrough.