Write text, calculations, and annotations with the same ease as you would on paper or in a book. Annotate your calculations to avoid forgetting what they were about. Perform calculations such as addition +, subtraction -, division ÷, multiplication ×, percentage %, and power ^. Create unlimited tapes using + button in tabs bar, switch between tapes using browser like tabs. View/Rename/Delete your saved tapes in the Bookmark menu, use the top left menu to view all tapes. Tapes will auto save, allowing you to pick up right where you left off. The numbers will auto format and auto indented as you type. Numbers are formatted according to your locale. You can define variables and use it in calculations. Hover cursor over variables to check it's value. Customize colors using the settings menu, number of decimals to display and indent length can be changed too. Tape calculation doesn't use operator precedence, the results will be as you would type it on a calculator.