Sleek: open-source and to-do app based on todo.txt. (Free software)

sleek is an open-source (FOSS) todo manager based on the todo.txt syntax. Stripped down to only the most necessary features, and with a clean and simple interface, sleek aims to help you focus on getting things done.

All classic todo.txt attributes are supported and enhanced by additional features. Creating todos is straightforward, and tag-based filtering in tandem with highly customisable grouping and smart full-text search allow for rapid information retrieval. Completed todos can be hidden or archived into separate done.txt files. Easy integration with other todo.txt apps is facilitated by continuously scanning todo.txt files for changes.

sleek is available for Windows, MacOS and Linux, and in several languages. For a detailed list of features, see below. Many useful information can be found in sleek's wiki.

It has a modern and simple GUI and many functions which help users get things done, it can be used in full-text search as filters or to group and sort tasks list.

It is easy to integrate sleek with other todo.txt apps, it can be filtered by contexts, project, and properties, has a dark and light mode, hyperlinks are detected automatically on it, it supports multi-line to-dos, filters, and more.

Furthermore, it is released under the MIT licensed and written with JavaScript, CSS, and more.


  • Uses existing todo.txt files or creates new ones
  • Add and search for todos by:
    • priorities
    • contexts
    • projects
    • due dates
    • creation dates
    • recurrences (repeating todos)
    • threshold dates
  • Sort and group todos by priority, due and creation date, context and project or as they occur in the text file
  • Filter todos by context, project and priority
  • Find todos using full-text search compatible with todo.txt syntax
  • Inline autocomplete available
  • Dates and priorities can be selected by built-in picker elements
  • Navigable via keyboard shortcuts
  • Tabindex available
  • Options for due date reminders and notification badges
  • Easily toggle between dark and light mode
  • Compact view and zoom available
  • Completed todos can be shown, hidden and archived
  • Multi line todos can be created
  • Filters are sorted alphanummerically and can be renamed or deleted
  • Hyperlinks detected automatically
  • File watcher scans todo.txt files for changes
  • Simultaneously manage multiple todo.txt files
  • Language options
    • English
    • German
    • Italian
    • Spanish
    • French
    • Simplified Chinese
    • Brazilian Portugese
    • Japanese
    • Turkish
    • Hungarian
    • Czech
    • Polish
    • Russian


macOS Windows, Linux


MIT license


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