Question: Can you recommend a chat messaging API that supports offline messaging and advanced moderation tools?

For a chat messaging API that supports offline messaging and advanced moderation tools, Stream is another top contender. Stream's Chat Messaging API offers offline support, a global EDGE network for high availability, and moderation tools. The service also comes with an Activity Feeds API for real-time updates and customizable ranking, and a Video & Audio API for secure and compliant video conferencing. With a range of pricing tiers, including a free tier for small-scale usage, Stream offers detailed documentation and UI kits to help with integration and customization.

Another top contender is Sendbird, a communications API platform that can handle a variety of communication channels like chat, voice and video. It also offers features like targeted messaging, group chat and AI-powered conversations. Its highly abstracted APIs and SDKs work on a broad range of platforms and industries. The service offers a free developer plan and several paid tiers, so it can accommodate a range of needs. That makes it a good option for developers.

Ably is a real-time digital experience platform that offers a variety of APIs for building powerful apps. That includes live chat, data synchronization and multiplayer collaboration, all with a publish/subscribe messaging pattern. Ably has a high uptime SLA and supports many programming languages through its library. That makes it a good option for apps that need powerful real-time features.

Last, ZEGOCLOUD offers APIs and SDKs for adding real-time voice, video and chat to mobile and web apps. It offers offline messaging, read receipts and live streaming. It supports multiple programming languages and has a pay-as-you-go pricing model. ZEGOCLOUD is designed for scalability and high availability, so it's good for many industries. The service also offers a lot of resources for developers, including documentation and tech support.