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πŸŽ’ Portable Programmable Text Convertor Hosted on URL:
Vue TypeScript HTML JavaScript
Branch: develop
Clone or download


Launch now as Web App

Mini Application Hosted on URL
Nipp is inspired by itty.bitty.

Nipp Word Count


The main purpose is to keep code safe in URL. Even if the service is shutdown, the code stays alive in URL. You don't lose time and efforts to write a code. You can save a code as a bookmark easily.


  • πŸŽ’ Portable
    • Application is hosted only on URL!
  • ⚑ Real-time response
    • All computation is done on client!
  • ☁️ No-server side execution
    • Nipp site is static hosted.
    • Your code are not sent to the web server
    • PWA - Progressive Web Apps

Quick Start

Try on, which counts the number of words!
Then, you can create your own apps!

Example Apps

(NOTE: The original source of World Clock is located at Thank you very much, SHIMIZU-san!)
(NOTE: The original source of 2048 Game is located at gabrielecirulli/2048. Thank you very much, the creators!)


Default language of Nipp is Ruby because Ruby makes us comfortable to write program!
Nipp is highly powered by Opal, which is a transpiler to JavaScript. Thank you very much, Opal project!

Also JavaScript Not Only Ruby

Nipp is not only for Ruby. JavaScript is also available. Here is Tetris on Nipp! Nipp Tetris

Try on The Tetris program is from an Japanese article - Commentary of Only 565 Bytes Tetris Programming.

URL Structure

Here is a structure of Nipp URL.<Page Title>/<Options>/<Compressed Code>

  • <Page Title> is title of your app
  • <Options> can be es2017, lzma, es2017,lzma, lzma,es2017 or etc.
  • <Compressed Code> is code compressed by deflate (no header, no checksum) or LZAM for now and encode it by Base64

Note that <Page Title>, <Options> and <Compressed Code> are under URL fragment #. This means your code is not send to Nipp web server!


  • es2017: Use ES2017 (default: Ruby(Opal))
  • func_es2017: Use ES2017 but evaluated by (new Function(...))() not eval(), so output is always empty but faster
  • lzma: Compress code by using LZMA (default: deflate)
  • click_run: Click to run not real-time evaluation
  • promise_wait: Wait for Promise evaluation in output

PWA - Progressive Web Apps

Nipp runs even offline! Note that Nipp is available in flight mode ✈️.

Nipp PWA

Examples of promise_wait


Icons made by Freepik from is licensed by CC 3.0 BY
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