PROGRAMMATIC VOICE

Simple, secure 
in-app video and voice SDKs

Let your users make secure, high-quality calls right inside your app. Keep them engaged, reduce telephony costs, and protect user privacy with end-to-end encryption.

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in-app video and voice SDKs
Join over 150,000 businesses, including 8 of the 10 largest tech companies in the world

WHY SINCH IN-APP CALLING

Keep users engaged and connected without leaving your app

In-app calling uses WebRTC and VoIP to deliver HD voice and video while lowering costs. With Sinch SDKs for iOS, Android, and JavaScript, integration is a breeze, so you can focus on creating a great user experience.

Higher engagement

In-app video and voice calling keeps users in your app, for better satisfaction, retention, and conversion.

Global reliability

Regional data centers across five regions provide low-latency connections and 99.95% uptime.

Pay-as-you-go cost

With $0.003 per minute pricing for both making and receiving calls, you can save on international calling.
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BETTER COMMUNICATION & ENGAGEMENT

Keep users talking without leaving the app

Give your users high-quality voice and HD video directly in your app. Users stay engaged without switching platforms, leading to fewer drop-offs and more completed interactions.

  • HD voice using the Opus codec

  • App-to-app and app-to-phone flexibility

  • Improves user satisfaction and loyalty

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INCREASED SECURITY & PRIVACY 

Secure every call with end-to-end encryption

Security is built in. Sinch is ISO 27001 certified and GDPR compliant, keeping sensitive data private—perfect for healthcare, finance, and other regulated businesses.

  • End-to-end encrypted calls 

  • Fraud prevention within your app ecosystem

  • Peace of mind for you and your users

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COST SAVINGS & GLOBAL REACH

Connect worldwide without breaking the bank

Internet-based VoIP and WebRTC replace expensive PSTN minutes. Sinch’s global network across five regions keeps latency low, with most calls connected peer-to-peer for speed and reliability.

  • $0.003 per minute pricing

  • 99.95% uptime SLA worldwide

  • Instantly scalable with no new hardware

REAL-WORLD USES 

Add value across industries 

Customer support

Offer real-time voice or video help within e-commerce, banking, or service apps for faster resolutions.

Healthcare

Support secure telemedicine sessions and remote patient check-ins without leaving the provider’s app. 

Marketplaces and logistics 

Connect buyers, sellers, drivers, and customers safely, with number masking when needed.

Social and dating apps

Keep communities active with person-to-person voice and video.

Financial services

Provide secure, compliant communications between clients and advisors.

POWERFUL TOOLS 

Everything you need for in-app video and voice calling 

Cross-platform SDKs 

iOS, Android, and JavaScript SDKs make integration simple. 


HD voice and video 

Opus codec and HD video for clear, reliable conversations. 


App-to-app and app-to-phone 

Connect users inside your app or reach traditional phone numbers. 

End-to-end encryption 

Built-in security for every call. 



Global network 

Regional data centers for low latency and high availability. 

Customizable UI 

Match the calling interface to your app’s branding. 


99.95% SLA 

Enterprise-grade reliability you can count on. 


Easy integration 

Abstracts WebRTC complexity so you can launch faster. 

Frequently asked questions about in-app video and voice calling

In-app video and voice calling lets users make secure calls within a mobile or web app, without having to leave the app.  

In-app calling uses the internet (VoIP/WebRTC) instead of cellular networks, saving costs and integrating better with your app. 

Yes. Sinch in-app calling is end-to-end encrypted, ISO 27001 certified, and GDPR compliant, making it more secure than traditional PSTN calls and ideal for regulated industries. 

It’s possible, but building your own solution is complex and resource-intensive. Sinch offers a pre-built, scalable, and reliable platform with support. 

Developers integrate Sinch SDKs for iOS, Android, or JavaScript. When a user makes a call, Sinch handles signaling and connects the call over the internet to another user or a phone number. 

You need a Sinch account and developers experienced in mobile or web apps. End-users need a compatible device, internet connection, and your app with in-app calling included. 

Sinch offers pay-as-you-go pricing at $0.003 per minute for both making and receiving calls. 

Yes. Sinch SDKs allow you to brand and customize the calling UI to match your app’s design. 

Yes. Sinch supports both HD voice and video calling within your app. 

Sinch provides SDKs for iOS, Android, and JavaScript, providing cross-platform support for mobile and web apps. 

Talk to an expert about adding voice and video to your app

Learn how to integrate secure, high-quality voice and video calling with our SDKs and keep users connected without leaving your app.