Best Free Chat SDK & API Software of 2025

The complete in-app collaboration API and SDK. Add contextual activity feeds, chat, and document collaboration directly into your apps to increase user engagement, improve in-app retention, and reduce customer churn. Modern apps need advanced collaboration features. Period. And let’s face it — a lot of app developers struggle to prioritize building their core functionality versus adding the contextual collaboration features that keep users engaged and productive. The big B2B tech players are already acquiring or building out chat, secure file sharing, contextual activity feeds and threaded conversations functions, which means every app is going to need them to stay competitive. That’s where Weavy comes in.

Digital Samba is a video conferencing solution that uses innovative features and technology to fulfil its customers' communication and collaboration needs. Clients use the platform for daily business meetings, webinars, online learning, application development, etc. The platform is the result of 19 years of experience at the forefront of the video conferencing space. This experience has helped create a feature-rich platform ready to adapt to changing technologies and workplace practices. Digital Samba's customers include world-renowned companies like McDonald's, Deloitte, Ferrari, Raiffeisen Centrobank, American Express and more. Thanks to the Digital Samba Embedded SDK, you’ll be able to integrate and control a full video conference experience inside your application by simply copy-pasting a few lines of JavaScript code.

Bird, previously known as MessageBird, stands as a cutting-edge CRM tailored for Marketing, Sales, and Payments, facilitating over 5 trillion messages annually through platforms like Email, SMS, and WhatsApp. Notable brands enhance their growth efficiently with Bird by engaging in personalized communication via these channels. Innovative enterprises across the globe leverage Bird's diverse applications and APIs to craft effective communication solutions. Begin your journey today and engage with your customers across any channel, addressing a wide array of use cases globally. Whether it's marketing communications, push notifications, or updates on orders and deliveries, Bird has you covered. Are operational hurdles hindering your expansion? Streamline your processes with automated conversations and workflows that gather essential information early, minimize manual efforts, establish self-service options, and direct chats to the appropriate representative. You can quickly set up and start utilizing our dependable, auto-scaling APIs, supported by comprehensive documentation, detailed API references, and user-friendly SDKs, enabling seamless integration into your existing systems.

One Platform for Realtime Communication: A platform to build and operate real-time interactivity for web, mobile, AI/ML, IoT, and Edge computing applications Faster & Easier Deployments: SDK support for 50+ mobile, web, server, and IoT environments (PubNub & community supported) and more than 65 pre-built integrations with external and third-party APIs to give you the features you need regardless of programming language or tech stack. Scalability: The industry’s most scalable platform capable of supporting millions of concurrent users for rapid growth with low latency, high uptime, and without financial penalties.

ApiRTC serves as a developer-friendly library designed to seamlessly embed real-time communications, such as chat, audio, and video, into both web and mobile applications. Utilizing WebRTC technology, it ensures that media streams are encrypted and ideally transmitted through peer-to-peer connections; however, if necessary, a media relay via a TURN server can be employed. Acting as the central hub of our platform, ApiRTC handles the establishment of all user connections, presence tracking, and media setup. The library is offered in various formats to cater to different integration needs, whether for web applications, hybrid apps using JavaScript, or native applications developed for iOS and Android platforms. Furthermore, Apizee's solutions for audio and video communication are built on the WebRTC standard, which is increasingly supported by a wide range of internet browsers. This growing compatibility not only enhances the functionality of our solutions but also ensures that users can access audio and video streaming across most PCs, tablets, and smartphones, thereby significantly broadening the reach of our communications tools. Additionally, developers can leverage the flexibility of ApiRTC for a variety of use cases, making it an invaluable asset for modern application development.

Headquartered in Silicon Valley, Gupshup is a leading conversational messaging platform that enables businesses to build engaging conversational experiences seamlessly across 30+ messaging channels using a single API. Gupshup offers an easy-to-use omnichannel messaging API, advanced bot-building platform and mobile marketing tools. Gupshup's messaging platform handles over 6 billion messages per month enabling over 39,600 businesses send messages to several billion users across popular messaging channels such as SMS, Voice, WhatsApp, Mobile Web, Android RCS, Instagram, Twitter, Telegram, WeChat, FB Messenger, Slack, Viber, Skype and many more. Our Single API solution for 30+ messaging channels has enabled businesses to easily integrate 1-way and 2-way messaging on WhatsApp with fall back to SMS connectivity in over 225 countries with multi-channel auto routing option. Additionally, Gupshup Bot platform supports over 36,000 bots and can easily handle WhatsApp FAQ Bots with live agent handoff for various customer support use cases

Dyte's Video SDK and APIs are SOC 2, GDPR, and HIPAA compliant. Embed scalable, customisable and secure video call into your web or mobile app with just few lines of code. It is compatible with Android, iOS, React Native, Angular and many more languages. With an uptime of 99.99%, industry-leading documentation, UI kit and out of the box plugins, customize the video experience within minutes.

Enhance your applications by integrating captivating real-time voice, video, and in-app chat functionalities through ZEGOCLOUD's communication APIs. With just four lines of code, you can kickstart the process and unlock a wealth of interactive features. Utilize our comprehensive voice, video, and in-app chat SDKs to tailor the communication capabilities your users desire, allowing them to connect, share, and engage with one another at any time and from anywhere. Elevate the user experience with a diverse range of add-ons such as emotionally intelligent avatars, AI-enhanced video effects, interactive whiteboards, and much more. Ensure seamless communication quality in real-time while also gaining valuable insights into user interactions through our advanced monitoring and analytics tools, empowering you to swiftly address any challenges and perpetually enhance your offerings. ZEGOCLOUD's innovative social solutions enable you to create personalized one-on-one and group video calls, lively audio rooms, and dynamic social live streaming, fostering connections and enjoyable experiences for your users. By leveraging these tools, you can cultivate a vibrant community where users can forge lasting relationships and share memorable moments together.

With over 700 direct carrier connections and 60+ offices on 6 continents, Infobip is a global leader in omnichannel communication. We make it our business to simplify how brands connect with, engage and delight their customers at global scale. Our programmable communications platform delivers a suite of tools for advanced customer engagement and support, plus security and authentication. We make this available to you across the widest range of communication channels possible. THE INFOBIP ADVANTAGE (1) Personalized omnichannel customer connections Achieve deeper customer engagement across the widest selection of local and global channels, including: SMS, RCS, WhatsApp, voice, video, email and the most popular chat apps. (2) Global reach, local presence Our 60+ offices around the world allow us to react faster. We provide 24/7 customer support, technical solutions in-line with needs and local requirements — based on proven best practices. (3) Full stack customer engagement Deliver better outcomes for your business by enhancing your communications with fully integrated contact center, marketing automation, and chatbot building solutions informed by our customer data platform.

Mesibo serves as a robust real-time communication platform that enables the seamless integration of messaging, group chats, voice calls, and video conferencing into both mobile and web applications. When developing the Mesibo APIs, our primary focus was on ensuring reliability, performance, and scalability, as we recognized that overly complex APIs can lead to unnecessary complications and increased error rates in applications. Rather than following the trend of convoluted API designs, we have prioritized simplicity while maintaining powerful capabilities. In this section, we will delve into the intricacies of Mesibo's real-time APIs. It is advisable to check out the source code of one of the sample applications available on GitHub to gain insights into how these APIs are effectively utilized. This approach will facilitate your ability to write cross-platform code seamlessly. In the subsequent sections, we will outline the APIs along with their respective names and parameters, providing you with a comprehensive understanding of their functionality. Additionally, this will empower you to implement the APIs more effectively in your projects.

Streamlined SaaS App Integrations Made Effortless. Kloudless is an advanced API integration platform that consolidates endpoints and data structures from various SaaS APIs, allowing you to write code just once and seamlessly connect your application with multiple SaaS providers. We have navigated the complexities of over 150 APIs on your behalf. Our expertise in communicating with and managing these numerous APIs means you can focus on your core product. Collaborate with us to ensure your application can connect with any SaaS solution your customers desire. Our Unified APIs simplify the integration process by harmonizing endpoints and data models from various SaaS APIs, enabling you to code once and integrate many. By abstracting the differences among numerous SaaS APIs, our Unified APIs facilitate rapid integration development, helping you bring new features to market faster. Additionally, we provide valuable features such as real-time activity monitoring and pre-built tools like the File Picker and Crawler, which are not always available from the SaaS providers themselves, further enhancing your integration capabilities. With Kloudless, you can maximize efficiency and deliver exceptional value to your users.

Introducing a cutting-edge Real-time Chat SDK and Messaging API tailored for applications and websites. With the ChatCamp platform, you can seamlessly integrate in-app messaging for both mobile applications and websites, ensuring a smooth user experience. Our product architecture is designed to effortlessly scale your infrastructure as needed, making it ideal for accommodating thousands of concurrent users. Leveraging the exceptional infrastructure of Google Cloud Platform, we guarantee a service that is both reliable and efficient. We adhere to the highest industry standards to safeguard data security and maintain user privacy. Concentrate on developing your application without the hassle of creating chat functionality from the ground up, as we provide comprehensive support. Utilize our chat SDK and messaging API to craft a fully operational chat application compatible with Android, iOS, JavaScript, and various platform APIs, allowing you to focus on innovation. Whether you're a startup or an established business, our solutions are crafted to elevate your communication capabilities.

You want the best voice quality, messaging, and other features. You need an API provider that has its own network across the country to get them. You can eliminate the middleman, cut costs, gain more control, and create the application your customers want. This is not a new concept. However, you need a partner to help reach the scale you are capable of. Bandwidth can help you reach your full potential, whether you are bringing your own carrier to market or creating your own solution.

Billions of people. Trillions of connections. One API. The Nylas APIs are powering applications with email, calendar and contacts that sync from any inbox around the globe. Nylas is the only company that provides an API for all email, calendar and contacts integrations. Contact records can be updated with missing information. A connection graph can make intros more warm. To create a single data source, combine data from each address book.

Create your own messaging platform complete with chat and video call capabilities in just a few minutes by utilizing the QuickBlox chat API and SDK. QuickBlox offers an instant messaging API that seamlessly integrates chat and calling features into any application, whether it be for Android, iOS, or the web. It encompasses all the essential functionalities needed to develop a top-notch messaging app, including high-quality one-on-one and group calls powered by WebRTC. Additionally, it provides flexible data and file storage solutions that enhance your messaging experience. You can easily integrate ongoing business workflows with real-time alerts and notifications, as well as share and link a wide array of file types, including images, audio, video, documents, and more. QuickBlox is currently utilized by over 30,000 software developers and organizations around the globe. As a HIPAA-compliant chat solution, QuickBlox is trusted by healthcare providers worldwide, catering to a diverse clientele that ranges from large corporations managing millions of healthcare and insurance records to innovative startups relying on our services for their telemedicine communication needs. This versatility highlights the effectiveness of QuickBlox in meeting various industry demands.