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QwikTape: Do calculations, annotate like you would on a paper

QwikTape logo by Viral Ghelani
Do calculations, annotate it like you would on a paper “qwikly”.

       100.00 my wallet balance
-       40.00 food

Create unlimited documents called tapes and switch between created tapes easily using browser like tabs.

  • Write text, calculate, annotate it like you would on a paper or in a book.
  • Never forget what was the calculation about by annotating it.
  • Do calculations like addition +, subtraction -, division ÷, multiplication ×, percentage % and power ^.
  • Create unlimited tapes using [+] button in tabs bar, switch between tapes using tabs.
  • View/Rename/Delete your saved tapes in the Bookmark menu, use the top left menu to view all tapes.
  • Tapes are auto saved.
  • The numbers will auto format and auto indented as you type.
  • Numbers are formatted according to the locale.
  • User 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 use 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.

+      2.00
×      3.00
  • Expressions use operator precedence. myvar = 1 + 2 × 3 myvar is 7.
  • All the calculations are done with infinite precision, so 0.1 + 0.2 = 0.3


Download QwikTape from releases,


git clone --recurse-submodules

and run

run-win.bat for windows
sh for linux
sh for macosx

QwikTape the name is inspired by QuickJs used by Sciter, the engine which powers this application, and Tape which is what it used to be called for such documents.

The logo is inspired by the Rail-Road diagram the QwikTape grammar generates and a calculator.

Chevrotain toolkit to build the parser.

Also inspired by CalcTape, Numi, Soulver, Calca

  • i18n
  • Themes
  • Printing support
  • PDF export

To execute linux binary after downloading use this command.

To execute macosx binary use this command.

sudo chmod +x qwiktape
sudo xattr -d qwiktape

QwikTape uses awesome Sciter SDK for its gui and chevrotain for the parser,

Clone the repo with submodules using,

git clone --recurse-submodules

Directory structure,

  • sdk the sciter-js-sdk as a submodule

  • src the source directory of the application

    • assets icons and logos
    • components all the reactor widgets
    • chevrotain the parser toolkit
    • parser the heart of it all
    • storage the database logic
    • main.htm the entry point
  • tests all the tests goes in here

  • run-dev.html for developers to debug and support in making changes.

Start developer mode by using,

run-win.bat -dev for windows

sh -dev for linux

sh -dev for macosx

from the prompt, it will give you developer view of QwikTape with controls to help you make changes. It launches scapp from sciter-js-sdk with run-dev.html in --debug mode. Use inspector to inspect.


  • Diagram to produce rail-road diagram of the parser grammar.

  • Refresh to refresh the application frame for any changes to css or html.

  • Tests to bring up all the tests, run tests from the toolwindow.

  • Screen Shot to capture the image of the main application.

  • Build to produce final builds. (right now just windows)

I’ve build all assets like icons and logos inside src/assets in figma and are licensed under CC.

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