OpenHabitTracker is:

• Free and Ad-Free
• Open Source
• Privacy Focused: All user data is stored locally on your device
• Available on Windows, Linux, Android, iOS, macOS, and as a web app
• Localized to English, German, Spanish, Slovenian

Key features:

• Markdown support for notes
• Use categories and priorities to organize your notes, tasks, and habits
• Advanced Search, Filter, and Sort
• Data Export/Import: JSON, YAML, TSV, Markdown
• Import your notes from Google Keep
• Available in 26 themes with Dark and Light modes