Minnit is a cloud-hosted group chat service geared for live events and webinars. It can be easily integrated with an iframe and doesn't require people to register. Features include responsive design, lots of customization options, moderation controls, and file uploads and polls. Minnit has a range of pricing options for events of different sizes and complexity.
Another powerful option is TalkJS. It offers a full-featured chat API and SDK for a range of chat use cases, including group chat, AI chatbots and live events. With features like prebuilt UI, customizable styling and real-time translation, TalkJS is geared for fast development and large-scale use. Pricing is based on Monthly Active Users, but there's a free development mode for testing.
If you want more advanced group chat abilities, check out GroupMe. The app is designed for structured discussions with up to 10,000 members and comes with features like topic chats, AI help, group calling and mod controls. It's good for events where people need to communicate in an organized way and where ease of use is important.
Last, Ably is a real-time digital experience platform with APIs for live chat, data broadcasting and other services. It offers a variety of tools to build scalable, reliable apps, including real-time data synchronization and uptime guarantees. It's good for big events where you need powerful, secure communication services.