You’ll have them at hello
It only takes seconds for people to decide if they
like a voice or not. Use our app to app phone
calling SDK to establish trust & build more
personal relationships with your customers.
Get to know your customers
Our easy to set up and use app to app phone calling API can help you get a handle on metadata & know the identity & context of callers to help them get to a solution quicker, making the customer experience and data voice calling a breeze.
Provide real-time communication
You’re in good hands, with over 250 million calls per month running through our app to app calling API, we know how to start personal conversations between you & your customers - it's a Sinch!
Get crystal clear quality
For over 10 years we’ve gathered deep knowledge on WebRTC, & fine-tuned our VoIP services, to make it easier for you to enjoy HD quality voice calls via our app to phone calling API and SDK.
No matter what connection you're on, we always prioritise voice quality to keep the conversation between you and your customers flowing.
Send the data directly to the receiver. Less travel time means better quality and we always take the fastest route.
Stability & support as standard
Carbonapps help friends & family keep in touch via yabChat
Carbonapps needed a reliable app-to-app voice and video calling solution for their yabChat Messenger app - they turned to Sinch for the answer.
"We opted for Sinch due to the quality, ease of integration and excellent customer support."
Eddie Siah-Armah, Director of Operations, Carbonapps
Enabling crisp, HD quality calls
Rebtel are an international VoIP company
Rebtel providing international calling apps for iPhone, Android, Windows Phone and PC are powered by app-to-phone calls and SMS by Sinch.
“Sinch gives us a mix of fantastic quality and solid reliability that the Rebtel app depends on."
Anna Alenius-Mathson, Head of Communications, Rebtel