Question: I need a secure and private note-taking solution that protects my data and offers advanced search features.

If you want a private and secure note-taking app with powerful search, mymind is a good option. This AI-based tool lets you store and organize notes, photos and highlights without folders or tags, with options like keyword search, AI-powered smart bookmarking and text recognition. Mymind doesn't track or sell user data, and it offers several pricing tiers, including a free version.

Another powerful option is Capacities, which stores information in a non-hierarchical data model using objects like books, people or ideas. It offers daily notes, media capture and full-text search. The AI Assistant can engage with your notes to offer suggestions for improvement, and the service protects data with GDPR compliance, encrypted servers and two-factor authentication. Capacities is available as a mobile app and with a public API for programmatic access.

If you want an AI-infused tool with more advanced abilities, Reflect uses GPT-4 and Whisper technology for features like voice note transcription, article summarization and grammar checking. The app supports end-to-end encryption and works online or offline on multiple devices. It also integrates with services like Zapier, Readwise, Google and Outlook, making it a good option for more elaborate note-taking.

Last, Supernotes is a collaborative note-taking app that supports rich formatting and has a relatively simple but effective system for organizing your notes. It uses AI for spotting typos and grouping ideas and stores data privately and securely. Supernotes is available on multiple devices and works offline with automatic synchronization, so it's good for a variety of situations and tasks.