Best Voice Calling API & SDK Providers for WhatsApp

Use the language you already love to prototype ideas quickly, develop production-ready communications applications, and run serverless applications on one API-powered platform. Twilio is a single fully-programmable platform with flexible APIs for any channel, built-in intelligence, and global infrastructure to support you at scale. Quickly integrate powerful APIs to start building solutions for SMS and WhatsApp messaging, voice, video, and email. Browse documentation and SDKs in multiple coding languages, including Ruby, Python, PHP, Node.js, java, and C#, or jumpstart your first project with our open source code templates to quickly build production-ready communications apps. Consult our community of over 9 million developers for guidance and inspiration on your next project. Sign up and start building today.

Bird (formerly MessageBird), the next-generation CRM, is a powerful tool for marketing, sales, and payments. It powers over 5 trillion messages per year across Email, WhatsApp, and SMS. Bird helps leading brands grow more cost-efficiently through personalized interactions via Email, SMS, or WhatsApp. Bird's APIs and applications are used by the most innovative companies in the world to build communication solutions. Start today and communicate with your customers on any channel, for any purpose, anywhere in the globe. Marketing messages, push notification, order updates, shipping alerts, and more. Operational bottlenecks limiting your growth? Automated conversations and workflows can be used to collect critical information, reduce manual tasks, implement Self-Service flows, and route chats directly to the right agent. Our auto-scaling, reliable APIs are available with comprehensive documentation, complete API references, and intuitive SDKs.

Engage customers like never before, on any channel. CPaaS, APIs for SMS Voice, Video, and Verification. In seconds or less, reach every mobile phone in the world. Engaging customers in the right way can help increase your webshop orders by more than just doubling. We're experts in this field. A major telco company was able to do exactly that using an online chatbot. We assisted a major automative company to re-engage and convert end of funnel prospects who were not responding to emails. The personalized Rich SMS campaign's results speak for themselves. Are your customers missing important appointments? SMS reminders can help you and your customers increase revenue. Trusted by developers all over the globe. With just a few lines code, you can build confidence and boost your business. Connect with your customers and add value every step of their journey.

Global SMS/RCS and voice-cloud communications allow you to deliver timely, personalized information. Get a deeper understanding of customers using actionable global phone numbers and subscriber data intelligence. TeleSign's Messaging API allows you to code once and send messages to your customers at scale. It also supports waterfall delivery between channels. TeleSign Messaging API supports SMS, RCS and WhatsApp, allowing you to create secure digital communications that can connect you with customers around the globe. Integrate a single MessagingAPI to send secure, reliable SMS, RCS, and WhatsApp messages directly to your customers. You can choose one or all of these channels to expand your programmable messaging strategy. Reach more customers through 120+ optimized points of presence and 700+ direct to-carrier routes

Conversations are the best way to create customer journeys. Engaging experiences that move customers. Developers love it. Built for business. Vonage Communications APIs (formerly Nexmo), help growing startups and agile businesses improve their customer experience and realize new business results at scale. Our APIs, global platform and expert support make it easy to simplify communications and innovate faster. Voice interactions can be reimagined to transform customer experiences. Every message should be viewed as an opportunity for you and your customers. Secure and private logins are made easier with this tool. Cloud-based voice applications that are modern and high-quality. You can programatically send and get SMS from almost every country. Get real-time information on any phone number around the globe. You can make and receive calls using your existing VoIP infrastructure.

Our cloud communications platform is used by thousands of businesses to strengthen their relationships with customers. Communication Platform is a trusted tool for global connectivity and digital transformation. It supports the most innovative technologies around the globe and combines all options. You can send push notifications, delivery alerts and order updates. Rich media chat and chatbots can be used to empower your team and cater to all client's needs, anywhere and anytime. Access a large library of API references to build your workflows however you like. Secure 2-factor authentication and seamless verification can help protect user identities and accounts from online fraud.