This add-on is operated by Brighter Planet

Track the carbon footprint of your web application


Last Updated: 19 March 2014

add-on environment

The Tronprint add-on is currently in beta.

Table of Contents

Tronprint tracks the carbon footprint of your web application, provided by Brighter Planet.

Deploying to Heroku

Tronprint requires a persistent datastore to store your application’s usage statistics. Any datastore supported by moneta will work. The easiest datastore to use with Heroku is MongoHQ.

To install MongoHQ:

$ heroku addons:add mongohq:free

Once you have chosen a datastore, install the tronprint add-on:

$ heroku addons:add tronprint:commercial

Depending on what Ruby web framework you’re using, follow the relevant directions below.

Rails 3 configuration

Add Tronprint and mongo (if using MongoHQ) to your Gemfile:

# Gemfile
# ...
gem 'tronprint'
gem 'mongo'

Somewhere in your views, you can use the methods provided in TronprintHelper to display the site’s total footprint, a link to the foot print calculation’s methodology, and a CM1 badge.

In whichever controller(s) that will use TronprintHelper (or in ApplicationController), simply require the helper:

class FoosController
  helper TronprintHelper

Rails with ActiveRecord

If you’d like to use your Rails app’s existing ActiveRecord datastore for storing Tronprint statistics, simply add the following to a new file, config/initializers/tronprint.rb:

Tronprint.aggregator_options = { :adapter => :active_record }

Before you get started with Tronprint on ActiveRecord and you’re using a relational database, (e.g., mysql) then you need to create the table Tronprint will use for storage. The easiest way to do this is add to your Rakefile:

require 'tronprint/rake_tasks/active_record'

Then, run rake tronprint:moneta.

Sinatra configuration

In your app.rb, add:

require 'tronprint'
require 'mongo'

TronprintHelper is Rails 3 specific, but if demand for a Sinatra-compatible helper module arises, we will make one. For now, you can use the source of TronprintHelper to help you display your footprint.

Configuring Tronprint

If you choose to use a different datastore than MongoHQ, you’ll need to configure Tronprint when your application initializes. In Rails, Tronprint’s aggregator (the interface to the key/value store) can be initialized in config/initializers/tronprint.rb:

Tronprint.aggregator_options = {
  :adapter => :my_adapter,
  :configuration_setting_a => 'foo',
  :configuration_setting_b => 'bar'


Support is available from Brighter Planet at the following locations:

  • via IRC at #brighterplanet on Freenode during normal US business hours.
  • via Twitter
  • via Email