Best Mobile App Live Chat SDKs softwares in 2025

OneSignal is a notification delivery platform for developers and product teams that sends push notifications, in‑app messages, email, and SMS to web and mobile users. It’s aimed at apps, websites, and marketing teams that need event-driven, segmented messaging with analytics and automation.

CometChat provides SDKs, APIs and prebuilt UI kits to add real-time messaging, voice and video calling, moderation, notifications and AI agents into web and mobile apps. It is aimed at product teams, developers, and engineering organizations that need a scalable, secure communication backend without building infrastructure from scratch.

Real-time messaging and pub/sub APIs for developers building collaboration, chat, notifications and live-updates into web and mobile apps. Designed for engineering and product teams that need scalable WebSocket-based channels, presence information, and event delivery without building a custom realtime backend.

Chat | Twilio provides an API-first conversational chat capability (powered by MessagingX and the Conversations API) for adding in-app and web chat, plus cross-channel messaging (SMS, MMS, WhatsApp, Facebook Messenger). It’s intended for product teams, customer support, e-commerce operations, and developers who need a programmable, scalable chat layer integrated with Twilio’s messaging platform.

Stream provides cloud-hosted APIs and SDKs for real-time activity feeds and in-app chat. It is designed for product teams, mobile and web developers, and companies that need scalable, low-latency feeds and messaging without building an entire backend from scratch.

PubNub provides a globally distributed publish/subscribe network, SDKs, and real-time APIs to build, manage, and optimize messaging-driven applications at massive scale. It’s aimed at developers, product teams, and enterprises building chat, presence, multiplayer, IoT, and live data experiences.

AI customer service platform that provides omnichannel, context-aware AI agents for enterprises. Sendbird AI is designed for support and sales teams that need conversational automation integrated with tools like Zendesk and Salesforce, with enterprise-grade security, auditing, and professional services.