LockNote is an iPhone application developed by Pingtan Maque Information Technology Co. Ltd., offering encrypted note-taking capabilities for users. The program supports various functions including notes, accounting, checklists, and card packages. With the notepad function, users can encrypt or hide notes, and choose to store data offline or back it up to Lock Cloud, iCloud, or locally. Users can also integrate graphics, pictures, videos, audios, event reminders, and rich text editing within their notes, and export them as long pictures or PDFs. Additionally, the app provides automatic synchronization for seamless data management.

LockNote's accounting book function supports multiple record types, quick shorthand entries, and automatic synchronization. The list function allows users to manage various types of lists with automatic synchronization. The card package function also offers automatic synchronization for easy data management. Users can utilize "My iCloud" to manage their data backups independently. Other features include a tourist mode, file management for transferring files to and from computers, personalized password settings, and customizable skin fonts to enhance user experience.