List of the Top 16 Free Chat SDK & API Software in 2025

Introducing a comprehensive in-app collaboration API and SDK, designed to seamlessly integrate contextual activity feeds, chat, and document collaboration into your applications, ultimately enhancing user engagement, boosting in-app retention, and decreasing customer attrition. In today's digital landscape, it's essential for modern applications to incorporate sophisticated collaboration capabilities. The reality is that many developers find it challenging to balance the development of primary functionalities with the integration of essential collaboration tools that enhance user interaction and productivity. Leading B2B technology companies are actively acquiring or developing features like chat, secure file sharing, contextual activity feeds, and threaded conversations, indicating that all applications will require these functionalities to remain relevant in the marketplace. This is precisely where Weavy steps in to provide the necessary tools for success. Moreover, Weavy empowers developers to focus on their unique offerings while effortlessly embedding collaboration features that meet user expectations.

Digital Samba offers an advanced video conferencing platform that leverages cutting-edge technology and features to meet the diverse communication and collaboration requirements of its users. Businesses utilize this solution for various purposes, including routine meetings, webinars, online education, and application development. Over the course of nearly two decades, the company has amassed significant expertise in the video conferencing field, leading to the creation of a highly versatile platform that evolves with technological advancements and shifts in workplace dynamics. Esteemed clients such as McDonald's, Deloitte, Ferrari, Raiffeisen Centrobank, and American Express trust Digital Samba for their conferencing needs. Moreover, with the Digital Samba Embedded SDK, integrating a comprehensive video conferencing experience into your own application is as simple as copying and pasting a few lines of JavaScript code, making it accessible to a wide range of developers. This seamless integration not only enhances user engagement but also streamlines workflow by providing high-quality communication solutions directly within existing applications.

Bird, formerly known as MessageBird, is a state-of-the-art CRM designed specifically for Marketing, Sales, and Payments, processing more than 5 trillion messages each year through various channels such as Email, SMS, and WhatsApp. Leading brands are leveraging Bird to drive their growth by facilitating personalized interactions through these platforms. Global innovators utilize Bird’s wide range of applications and APIs to develop effective communication strategies. Start your journey now and connect with your customers on any platform, catering to numerous use cases worldwide. Whether your needs involve marketing messages, push notifications, or tracking order and delivery updates, Bird is equipped to meet those demands. If operational challenges are stalling your growth, enhance your processes with automated dialogues and workflows that collect vital information efficiently, reduce manual intervention, create self-service capabilities, and route inquiries to the right representatives. With our reliable, auto-scaling APIs, you can easily initiate setup and integration, bolstered by exhaustive documentation, thorough API references, and intuitive SDKs, ensuring a smooth assimilation into your current systems. Embrace the future of communication with Bird and transform how you engage with your audience.

A Unified Platform for Instant Communication: An innovative solution designed for creating and managing real-time interactions across web, mobile, AI/ML, IoT, and edge computing applications. Streamlined and Accelerated Deployments: With SDK compatibility for over 50 environments including mobile, web, server, and IoT (supported by both PubNub and the community), alongside more than 65 ready-made integrations with various external and third-party APIs, the platform ensures you have access to essential features, irrespective of your programming language or technology stack. Unmatched Scalability: Recognized as the most scalable platform in the industry, it can effortlessly accommodate millions of simultaneous users, ensuring rapid expansion with minimal latency and high uptime, all without incurring financial penalties, making it a reliable choice for growing businesses. Furthermore, this platform is designed to evolve with your needs, supporting future advancements in technology seamlessly.

Ably stands out as the leading platform for realtime experiences. With more WebSocket connections than any competing pub/sub service, we facilitate connections for over a billion devices each month. Companies rely on us for their essential applications, including chat, notifications, and broadcasts, ensuring that these services run reliably, securely, and at an impressive scale. Our commitment to excellence makes us the preferred choice for businesses seeking to enhance their realtime capabilities.

ApiRTC is a user-friendly library that enables developers to effortlessly integrate real-time communication features, including chat, audio, and video, into web and mobile applications. By leveraging WebRTC technology, it guarantees that media streams are securely encrypted and can ideally be transmitted through direct peer-to-peer connections; in cases where this is not feasible, a TURN server can be utilized for media relay. Serving as the core of our platform, ApiRTC is responsible for managing user connections, tracking presence, and setting up media interactions. The library is available in multiple formats to suit a variety of integration requirements, whether for web platforms, hybrid applications utilizing JavaScript, or native apps designed for iOS and Android systems. Additionally, Apizee's offerings for audio and video communication are based on the widely adopted WebRTC standard, which is supported by an expanding array of internet browsers. This increasing compatibility not only improves the performance of our solutions but also guarantees that users can enjoy audio and video streaming on most PCs, tablets, and smartphones, significantly enhancing the accessibility of our communication tools. Moreover, developers can tap into the versatile capabilities of ApiRTC for diverse use cases, making it a crucial component in the toolkit for contemporary application development, thus ensuring that their projects meet modern user demands effectively.

Based in Silicon Valley, Gupshup stands out as a premier conversational messaging platform that empowers enterprises to create captivating conversational experiences effortlessly across more than 30 messaging channels through a unified API. The platform features a user-friendly omnichannel messaging API, a sophisticated bot-building framework, and effective mobile marketing solutions. Each month, Gupshup's messaging service processes over 6 billion messages, assisting over 39,600 businesses in communicating with billions of users via widely-used messaging platforms including SMS, Voice, WhatsApp, Mobile Web, Android RCS, Instagram, Twitter, Telegram, WeChat, FB Messenger, Slack, Viber, Skype, and various others. Its single API solution simplifies the integration of one-way and two-way messaging on WhatsApp, along with a fallback to SMS service in over 225 countries, all while providing a multi-channel auto-routing feature. Furthermore, the Gupshup Bot platform is equipped to manage over 36,000 bots and efficiently addresses WhatsApp FAQ Bots, enabling seamless live agent transitions for diverse customer support scenarios. This adaptability makes Gupshup a vital tool for businesses aiming to enhance their messaging capabilities and improve customer engagement.

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.

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.

Infobip stands as a prominent figure in the realm of omnichannel communication, boasting over 700 direct carrier connections and more than 60 offices spread across six continents. Our mission is to streamline the ways in which brands interact with, engage, and captivate their customers on a global scale. Our robust communications platform offers a comprehensive array of tools designed for superior customer engagement and support, along with essential security and authentication features, accessible through a vast array of communication channels. THE INFOBIP EDGE (1) Tailored omnichannel customer interactions Enhance customer involvement through a diverse range of local and international communication options, such as SMS, RCS, WhatsApp, voice, video, email, and leading chat applications. (2) Worldwide influence with localized service With over 60 offices worldwide, we can respond swiftly to client needs. Our team provides round-the-clock customer support, delivering technical solutions tailored to specific local demands, grounded in established best practices. (3) Comprehensive customer engagement solutions Boost your business performance by enriching your communication strategies with our fully integrated offerings, which include contact center capabilities, marketing automation, and chatbot development, all powered by insights from our customer data platform. Additionally, our commitment to continuous improvement ensures that we remain at the forefront of innovation in customer engagement.

Mesibo stands out as a comprehensive platform for real-time communication, allowing for the effortless integration of features such as messaging, group chats, voice calls, and video conferencing within mobile and web applications. In creating the Mesibo APIs, our central aim was to prioritize reliability, performance, and scalability, as we understood that overly intricate APIs could introduce unnecessary complications and higher rates of errors in applications. Instead of adhering to the trend of complex API frameworks, we chose to emphasize simplicity while retaining robust capabilities. This section will explore the detailed workings of Mesibo's real-time APIs. To better understand how these APIs function in practice, it is recommended to examine the source code of one of the sample applications hosted on GitHub, as this will enhance your ability to write cross-platform code seamlessly. Following this, we will provide a detailed overview of the APIs, including their names and parameters, to ensure you have a thorough grasp of their functionalities. Moreover, this knowledge will equip you to effectively implement these APIs within your own projects, thereby maximizing their potential. Understanding the underlying architecture of these APIs will also aid in troubleshooting and optimizing your applications.

Effortless Integrations for Your SaaS Applications. Kloudless is a sophisticated API integration platform that merges various SaaS APIs' endpoints and data structures, enabling you to write code a single time while effortlessly linking your application to multiple SaaS providers. Having tackled the intricacies of over 150 APIs for you, we allow you to concentrate on your main product instead. Partner with us to ensure that your application can effortlessly connect to any SaaS solution that your customers may need. Our Unified APIs streamline the integration process by aligning endpoints and data models from diverse SaaS APIs, allowing you to write once and integrate many. By simplifying the disparities among countless SaaS APIs, our Unified APIs accelerate integration development, enabling you to launch new features more swiftly. We also offer invaluable tools such as real-time activity monitoring and pre-built features like the File Picker and Crawler, which often aren't provided by the SaaS providers themselves, further enhancing your integration capabilities. With Kloudless, you can elevate productivity and provide outstanding value to your users, ensuring a competitive edge in the ever-evolving tech landscape.

Presenting a state-of-the-art Real-time Chat SDK and Messaging API designed specifically for both applications and websites. With the ChatCamp platform, users can easily incorporate in-app messaging into their mobile apps and websites, promoting a fluid and engaging user experience. Our architecture is built to scale your infrastructure effortlessly, making it perfect for handling a vast number of concurrent users. By utilizing the robust infrastructure of Google Cloud Platform, we ensure a service that stands out for its reliability and efficiency. We strictly follow the highest industry standards to protect data security and uphold user privacy. Focus on enhancing your application without the burden of developing chat functionality from scratch, as we offer extensive support. By using our chat SDK and messaging API, you can develop a fully functional chat application that works seamlessly with Android, iOS, JavaScript, and various platform APIs, which allows you to concentrate on creative development. Whether you're launching a new startup or are part of an established enterprise, our solutions are designed to significantly improve your communication capabilities and foster deeper connections with your audience. In today’s digital landscape, effective communication tools are essential for success, and our offerings are poised to meet those demands efficiently.

For optimal voice quality, messaging capabilities, and additional features, it's crucial to select an API provider that operates its own nationwide network. By doing so, you can remove intermediaries, reduce expenses, enhance your control, and develop the application that your customers truly desire. While this idea is not novel, you will require a partner to help you achieve the scale you are capable of reaching. Bandwidth is the solution that can assist you in unlocking your full potential, whether you aim to launch your own carrier or build a customized solution tailored to your needs. With the right collaboration, the possibilities for innovation and growth are limitless.

Countless individuals. Infinite interactions. A singular API. The Nylas APIs are the driving force behind applications that seamlessly integrate email, calendar, and contacts, syncing data from any inbox worldwide. Nylas stands out as the sole provider of an API that encompasses all email, calendar, and contacts integrations. Users can enrich contact records by filling in any missing details. Additionally, a connection graph enhances introductions by making them more personal. By merging data from various address books, you can establish a unified data source, ensuring consistency and accuracy across platforms. This comprehensive integration transforms how applications interact with essential communication tools.

Build your personalized messaging platform equipped with chat and video call functionalities in mere minutes by leveraging the QuickBlox chat API and SDK. QuickBlox provides an instant messaging API that effortlessly incorporates chat and calling capabilities into any application, be it for Android, iOS, or web platforms. It includes all the vital features necessary for creating a premium messaging application, offering high-quality one-on-one and group calling experiences supported by WebRTC technology. Moreover, it supplies adaptable data and file storage options that significantly enhance your messaging interactions. You can also seamlessly integrate ongoing business processes with real-time alerts and notifications, as well as share a variety of file formats, such as images, audio, video, and documents. Trusted by over 30,000 developers and organizations worldwide, QuickBlox serves as a HIPAA-compliant chat solution, earning the confidence of healthcare providers globally. This service caters to a broad range of clients, from large enterprises managing substantial healthcare and insurance records to forward-thinking startups that depend on our platform for telemedicine communications. Such adaptability underscores QuickBlox's capacity to fulfill diverse needs across various sectors, ensuring that users have access to reliable and effective communication tools. In a rapidly evolving digital landscape, QuickBlox stands out as a robust choice for those looking to innovate their messaging solutions.