Best Voice Calling API & SDK Providers

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Compare the Top Voice Calling API & SDK Providers as of April 2025

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What are Voice Calling API & SDK Providers?

Voice calling API and SDK providers offer developers with the necessary tools to integrate voice calling functionality into their applications. These providers typically offer a range of options, including APIs that allow for an easy integration process, as well as SDKs that provide more advanced features such as call recording and real-time transcription. They also often provide comprehensive documentation and technical support to assist developers in implementing these services. Some of the major players in this field include Twilio, Voximplant, and Nexmo, each offering their own unique set of features and pricing plans. In general, these providers aim to make it easier for businesses to incorporate voice calling capabilities into their products without having to build them from scratch. Compare and read user reviews of the best Voice Calling API & SDK providers currently available using the table below. This list is updated regularly.

  • 1
    Bird

    Bird

    Bird

    Bird (formerly MessageBird) is the next-generation CRM for Marketing, Sales, and Payments, powering over 5 trillion annual messages across Email, SMS, and WhatsApp. Leading brands grow cost-efficiently with Bird through personalized interactions on Email, SMS, and WhatsApp. The world's most innovative companies build communication solutions using Bird's applications and APIs. Get started today and talk to your customers over any channel, for any use case, anywhere in the world. Marketing messages, push notifications, order updates, delivery alerts and more. Operational bottlenecks slowing your growth? Use automated conversations and workflows to collect critical information up front, reduce manual tasks, implement self-service flows, and route chats to the right agent. Get up and running in minutes on our reliable, auto-scaling APIs with extensive documentations, complete API references and intuitive SDKs.
    1 Rating
    Starting Price: $45 per month
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  • 2
    Twilio Voice
    Create a scalable voice experience with the API that connects millions globally. With Twilio Voice, you can build unique phone call experiences with one API, to create, receive, control and monitor calls with just a few lines of code. Create an engaging voice experience that you can quickly scale and modify with a wide array of customization options and resources, like our Voice SDK. Then, add on features like Interactive Voice Response (IVR), recording transcriptions, and speech recognition to create an experience that your customers will appreciate. Whether you're looking to set up global conferencing or alerts & notifications, Twilio has the support you need for building with Voice. Find docs, code samples, helper libraries, and developer tools such as Twilio Runtime and our visual workflow builder, Studio.
    Starting Price: $0.0085 per min
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