Question: I need a secure way to share documents with clients and track their engagement in real-time.

If you need a secure way to send documents to clients and monitor their activity in real-time, Bit.ai is a top contender. It's got high-end document collaboration, real-time analytics and a variety of sharing options, including trackable links and password protection. With features like AI-assisted writing, interactive documents and smart editor abilities, it's good for keeping client communications and collaboration on track.

Another top pick is Dropbox, a well-established and secure service for storing and sharing files. Dropbox's real-time document analytics and permission controls let you see how clients are engaging and control who gets access to your data. Its different plans accommodate different needs, from individuals to enterprise teams, so it's a good option for any business.

If you're on a budget, check out Papermark. This open-source service lets you customize document sharing with real-time analytics, and it's free to use compared with DocSend. Papermark's different plans accommodate different user needs, whether you're a startup or a nonprofit, so it's a secure and inexpensive option for sharing documents and tracking engagement.

Last, Magic Documents is an AI-powered document management service that helps you work more efficiently while also protecting your data with enterprise-level security. It indexes, summarizes and extracts data from documents to cut down on errors and boost productivity, so it's a good option for automating document processing and collaboration.