List of the Top 9 Voice Calling API & SDK Providers for Flutter in 2025

Sendbird’s Voice and Video APIs enable organizations to incorporate high-quality, real-time voice and video communication into their applications. These APIs facilitate both one-on-one and group calls, offering an extensive array of features such as video mirroring, call muting, and screen sharing, all designed to enhance user interaction and experience. The platform also boasts multi-device and cross-platform functionalities, coupled with robust security measures including media stream encryption and HIPAA compliance. Perfect for sectors like healthcare, e-commerce, and social media, Sendbird allows businesses to develop engaging and secure communication solutions with minimal development complexity.

Twilio's Voice Calling API and SDKs provide organizations with the tools needed to embed voice communication features directly into their applications, facilitating smooth and effective interactions with customers via phone. This integration empowers companies to refine their customer engagement tactics by delivering tailored and immediate voice conversations. The Voice Calling API allows organizations to programmatically initiate, receive, and manage calls, granting a significant level of flexibility and oversight over their voice communication processes. This functionality is essential for businesses aiming to streamline call operations, such as customer service lines, appointment notifications, or sales outreach, ultimately leading to enhanced operational effectiveness and improved customer experience. Twilio's Voice SDKs are compatible with multiple platforms, including Android, iOS, JavaScript, and React Native, enabling developers to create voice-capable applications that function seamlessly across various devices.

MirrorFly serves as a tailored CPaaS solution, enabling businesses and enterprises to engage in real-time communications like instant messaging, voice calling, and video conferencing through its advanced Chat APIs and SDKs. No matter the specific requirements, technology stack, or devices used, MirrorFly empowers global brands to create their own chat platforms with extensive customization options and no restrictions. Among the numerous advantages offered by MirrorFly’s CPaaS are: ✅ Self-hosting capabilities for added control ✅ Limitless customization options to suit unique needs ✅ Complete ownership of data ensuring privacy ✅ An extensive array of over 1000 features ✅ Tailored security measures including Gmail, Phone, and Biometric options ✅ The ability to upload large files exceeding 3 GB ✅ Support for multi-tenant servers ✅ Scalability to accommodate over 1 billion concurrent users ✅ Complimentary migration and integration services ✅ The option to hire a dedicated team specifically for your project With these features, businesses can enhance their communication strategies effectively and efficiently.

EnableX simplifies the process of incorporating real-time communication capabilities into various applications and workflows. Specifically tailored for Service Providers and Systems Integrators, it offers a powerful, scalable, and secure communications platform that alleviates the burdens of network infrastructure management and complexity. With EnableX's wide array of programmable SDKs and APIs, developers can effortlessly customize and integrate communication features such as voice, video, and SMS into their existing systems and workflows. Furthermore, businesses can engage with customers globally through Virtual Number services, while also taking advantage of advanced functionalities including AI and natural language processing. This flexibility allows for enhanced interaction and connectivity in a rapidly evolving digital landscape.

CometChat serves as a versatile live chat platform that enables seamless interaction and collaboration between users and customers. Built with an API and Chat SDK, it can be installed either on-premises or in the cloud. This solution empowers users to engage in video, text, and voice conversations with their clientele, as well as share images through broadcast videos, enjoy games, and utilize whiteboards for enhanced communication. Among its key features, CometChat boasts WebRTC capabilities, file and screen sharing, real-time translation for different languages, and extensive customization options for layouts, languages, and color schemes. It also offers functionalities such as typing indicators, notifications for last seen status, read receipts, and a wide array of emojis and stickers, while allowing users to easily transition from text to video chatting. In addition to these primary features, CometChat provides several supplementary services, including broadcast messaging, guest login functionality, access to past messages, the ability to block or unblock users, and options for video broadcasting and voice notes. The pricing structure for this platform is determined by the number of monthly active users, and customer support is readily available through both email and phone channels, ensuring users receive assistance when needed.

Dyte's Video SDK and APIs adhere to SOC 2, GDPR, and HIPAA standards, ensuring a high level of security and compliance. You can effortlessly integrate scalable, customizable, and secure video calling capabilities into your web or mobile applications using only a few lines of code. The SDK supports various platforms, including Android, iOS, React Native, Angular, and numerous other languages. Boasting an impressive uptime of 99.99%, alongside comprehensive documentation, a user-friendly UI kit, and pre-built plugins, you can tailor the video experience to meet your specific needs in just minutes. This flexibility allows developers to enhance their applications quickly and efficiently, providing users with a seamless communication experience.

You can avoid spending months developing in-app messaging and activity feeds, as they can be implemented in just weeks through Stream's chat APIs or activity feeds. With Stream’s adaptable UI kits, dependable APIs, and developer-friendly SDKs, product teams can seamlessly add sophisticated communication features akin to those on popular social media platforms like Instagram and WhatsApp. Boasting an impressive 99.999% uptime guarantee, Stream's APIs support over a billion users and accommodate 5,000,000 concurrent connections, making them exceptionally scalable for both established enterprises and emerging startups. The intuitive software components streamline the process of deploying comprehensive activity feeds and in-app chat features, enabling faster delivery and enhancing your product's competitive advantage. As a result, you can focus on innovation and user experience while leveraging the power of advanced technology.

Transform your applications by incorporating engaging real-time voice, video, and in-app chat features with ZEGOCLOUD's robust communication APIs. By implementing just four simple lines of code, you can initiate the integration and gain access to a multitude of interactive functionalities. Take advantage of our extensive voice, video, and in-app chat SDKs to customize the communication features that your users crave, enabling them to connect, share, and interact anytime and anywhere. Enhance the user experience with a rich array of add-ons, including emotionally aware avatars, AI-driven video effects, and interactive whiteboards, among others. Ensure high-quality communication in real-time while also acquiring significant insights into user behavior through our sophisticated monitoring and analytics platforms, allowing you to promptly tackle any issues and continuously refine your services. ZEGOCLOUD's pioneering social solutions empower you to establish personalized one-on-one and group video calls, energetic audio rooms, and lively social live streaming, creating opportunities for users to connect and enjoy memorable experiences. By utilizing these tools, you can nurture a thriving community where individuals build lasting bonds and cherish shared moments together, thereby fostering a sense of belonging among users. This integration not only enhances user engagement but also positions your application as a leader in innovative communication solutions.

The seamless integration of a chat API and messaging SDK for mobile and web platforms is crucial for improving user engagement. This adaptable messaging SDK supports the creation of instant messaging applications, enabling real-time communication while providing a native chat interface. By utilizing a comprehensive messaging API, developers can greatly enhance the collaborative aspects of their messaging platforms. The SDK is crafted for perfect compatibility with various third-party applications, thereby broadening the functionality of the chat API. Users are empowered to design personalized chat applications that deliver a rich experience, encompassing features like voice and video calls, native messaging capabilities, multimedia sharing, and many more. Moreover, this solution facilitates the building of network communities and engaging social chat interfaces while ensuring consistent real-time messaging. Apphitect's instant messaging framework not only accommodates individual conversations but also promotes lively group chats that invigorate everyday exchanges. Furthermore, users can conveniently organize hangouts within their mobile chat applications, enhancing social interactions. In summary, this messaging SDK equips developers with the tools to create engaging and multifaceted communication solutions that truly resonate with their audience, ultimately transforming the way people connect and communicate.