Best Voice Calling API & SDK Apps for iPhone of 2025

Compare the Top Voice Calling API & SDK Apps for iPhone as of July 2025

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What are Voice Calling API & SDK Apps for iPhone?

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 apps for iPhone currently available using the table below. This list is updated regularly.

1

Sendbird

Sendbird

Sendbird’s Voice and Video APIs empower businesses to integrate high-quality, real-time voice and video communication into their apps. With support for both direct and group calls, these APIs provide a rich set of features such as video mirroring, call muting, and screen sharing, ensuring a seamless and interactive user experience. The platform supports multi-device and cross-platform capabilities, along with strong security features like media stream encryption and HIPAA compliance. Ideal for industries such as healthcare, e-commerce, and social platforms, Sendbird enables businesses to create engaging and secure communication solutions without complex development overhead.

126 Ratings

Starting Price: $399/month

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2

Agora

Agora.io

The Real-Time Engagement Platform for meaningful human connections. People engage longer when they see, hear, and interact with each other. With Agora, you can embed vivid voice and video in any application, on any device, anywhere. Agora provides the SDKs and building blocks to enable a wide range of real-time engagement possibilities. Our network monitors activity in real time and automatically selects the most efficient routing path for sub-second latency globally across 200+ data centers. Compatible with all popular development platforms and mobile-device friendly with minimal battery consumption. Architected to withstand sudden spikes in traffic, gracefully scaling from one to millions of concurrent users as your business demands. Developers can create unique experiences with our extensive APIs, customizable UI and pre-integrated third-party extensions. Deliver the best quality real-time voice and video to your users with ultra-low latency and intelligent routing.

Starting Price: $0.0265 per minute

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3

Nexa|Voice

AWARE

Nexa|Voice is an SDK that offers biometric speaker recognition algorithms, software libraries, user interfaces, reference programs, and documentation to use voice biometrics to enable multifactor authentication on iOS and Android devices. Biometric template storage and matching can be performed either on a mobile device or on a server. Nexa|Voice APIs are reliable, configurable, and easy to use, complemented by a level of technical support that has helped make Aware a trusted provider of quality biometric software and solutions for over twenty-five years. High-performance biometric speaker recognition for convenient and secure multifactor authentication. The Knomi mobile biometric authentication framework is a collection of biometric SDKs running on mobile devices and a server that together enable strong, multi-factor, password-free authentication from a mobile device using biometrics. Knomi offers multiple biometric modality options, including facial recognition.

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