Abba

Abba is a simple a/b testing self-hosted framework built to help improve conversion rates on your site.

Simple JavaScript API
Multi variant support
Filter results by date and browser

Setup

Requirements:

Ruby 1.9.3
Mongo

The default username and password are guard / llama. Change these in config.yml, unless you want everybody to access your test results. SSL is required in an production environment by default.

To run locally:

bundle install
thin start

Heroku 10 seconds setup

git clone git://github.com/stripe/abba.git && cd abba
heroku create
heroku addons:add mongohq:sandbox
git push heroku master
heroku open

The default username and password are guard / llama.

A/B testing API

First include abba.js using a script tag. The host of this url will need to point to wherever you deployed the app.

<script src="//localhost:4050/v1/abba.js"></script>

Then call Abba(), passing in a test name and set up the control test and variants.

<script>
  Abba('test name')
    .control('test a', function(){ /* ... */ })
    .variant('test b', function(){ /* ... */ })
    .start();
</script>

The control is whatever you're testing against, and is usually the original page. You should only have one control (and the callback can be omitted).

The variants are the variations on the control that you hope will improve conversion. You can specify multiple variants. They require a variant name, and a callback function.

When you call start() Abba will randomly execute the control or variants' callbacks, and record the results server side.

Once the user has successfully completed the experiment, say paid and navigated to a receipt page, you need to complete the test. You can do this by invoking complete().

<script>
  // On successful conversion
  Abba('test name').complete();
</script>

TLDR example

<script src="//my-abba.herokuapp.com/v1/abba.js"></script>

<script>
  Abba('Checkout')
    .control()
    .variant('Text: Complete Purchase', function(){
      $('form button').text('Complete Purchase');
    })
    .variant('Color: green', function(){
      $('form button').css({background: 'green'});
    })
    .start();
</script>

You can find a more complete example under ./public/test.

Options

If set the persist option to true, then the experiment won't be reset once it has completed. In other words, that visitor will always see that particular variant, and no more results will be recorded for that visitor.

<script>
  Abba('Pricing', {persist: true}).complete();
</script>

Credits

Thanks to the following projects: