Question: Is there a note-taking and task management app that offers advanced organization features, such as document hierarchy and tag-based categorization?

If you're looking for a high-end note-taking and task management app, IXORD is well worth a look. It's got a sophisticated note organization system with a document hierarchy and tagging system for categorization. It also has AI-generated explanations of tasks, a shared to-do list, and the ability to create tasks and subtasks. IXORD also has a powerful search function, a dock panel to pin important notes for easy access, and AES-256 encryption to protect your data. It's available on multiple platforms and is good for freelancers, businesspeople and students, with a free trial and a basic plan that costs $7.99 per month.

Another strong contender is Reflect. The app uses AI tools like GPT-4 and Whisper for features like transcribing voice notes, summarizing articles and checking grammar. Reflect lets you link notes with backlinks so you can easily follow information trails, and you can import web clips, Kindle highlights and other links across devices. It also integrates with services like Zapier, Google and Outlook, and it's got end-to-end encryption for security. Reflect is available on mobile, desktop and web versions and costs $10 per month annually.

If you want AI help organizing documents, Otio is worth a look. The AI-native workspace can automatically summarize documents and chat with you, and it's got AI-powered text editing and support for more than 20 languages. It can help you organize documents and generate ideas, which makes it a good fit for researchers, students and analysts. Otio offers a free plan with unlimited access to its AI models, so it's a good option if you want to try it out or use it for a variety of tasks.