Add telephony to your platform in 10 minutes
The Callizy Widget SDK embeds calls and SMS directly into your application. Your users no longer need to leave your tool.
3 lines of code. That’s it.
Integrate the widget into any web application in seconds.
See it in action
The widget opens, the call starts, the conversation begins — without leaving your app.
Integration
How it works
Create your app
Sign up for the developer portal and receive your client_id in minutes.
Integrate the widget
Paste 3 lines of code into your application. The widget appears, ready to use.
Your users connect
They authenticate with their Callizy account via OAuth. Zero friction.
What the widget offers
A complete softphone, embedded in your app. Not a gadget.
Full softphone
Inbound and outbound calls directly from your application. HD quality.
Integrated SMS
Send and receive SMS without leaving your platform. Threaded conversations.
Contextual history
Filter history by client via setContext(). Each record shows its own calls.
Automatic Caller ID
The right number displays based on the selected line. Multi-line supported.
Event bus
call.started, call.ended, sms.received — listen to every event to enrich your UI.
Click-to-call
Callizy.call(’+1...’) from your client records. One click, the call starts.
Use cases
One widget, dozens of scenarios
Real Estate
The agent calls the prospect directly from the property listing.
Healthcare / Clinics
The receptionist calls the patient without leaving the medical record.
Logistics
The freight forwarder calls the client from the package or shipment record.
Recruitment
The recruiter calls the candidate directly from the ATS.
Technical
For developers
Built to integrate cleanly, without breaking your stack.
OAuth 2.0 + PKCE
Secure authentication, no client-side secret.
Event bus complet
Listen to call.started, call.ended, sms.received and more.
API publique
Callizy.call(), Callizy.sms(), Callizy.setContext()
Shadow DOM
Zero CSS conflicts with your existing application.
~50 KB gzippé
Lightweight. No impact on your app performance.
Mises à jour auto
The widget updates via CDN. Nothing to maintain.
Why integrate Callizy
Retention
Your users stay in your platform for their calls.
Zero telephony development
No phone system to manage, no compliance. We handle it.
Support managed by Callizy
Infrastructure, technical support and updates — we handle it.
A real need
Your clients already need the phone. Give it to them.
Frequently asked questions
Ready to integrate?
Request developer access and add telephony to your platform today.