---
title: "The Twelve-Factor App"
source: Twelve-Factor App
source_url: https://github.com/heroku/12factor
licence: MIT
domain: engineering
subdomain: 12factor
date_added: 2026-04-25
---

# The Twelve-Factor App

Source for the content app running at: https://12factor.net/

## Development

### Prerequisites

You will need [Ruby](https://www.ruby-lang.org/en/documentation/installation/), [heroku](https://devcenter.heroku.com/articles/heroku-cli?utm_source=redirect&utm_campaign=cli)

### Run
```sh
bundle install
heroku local:start &
open http://localhost:5000
```

## Deployment

Changes should take place through Pull Requests. Deployment of changes is automatic when merged into `main`.

## Meta

Created by Adam Wiggins

Contributions from: James Lindenbaum, Mark McGranaghan, Chris Stolt, Ryan
Daigle, Mark Imbriaco, Keith Rarick, Will Leinweber, Jesper Jørgensen, James
Ward, Adam Seligman, Phil Hagelberg, Jon Mountjoy, Matthew Turland, Daniel
Jomphe, Mattt Thompson, Anand Narasimhan, Lucas Fais, Pete Hodgson

Translations and edits by:
[@sigerello](https://github.com/sigerello),
[@mahnunchik](https://github.com/mahnunchik),
[@francescomalatesta](https://github.com/francescomalatesta),
[@astralhpi](https://github.com/astralhpi),
[@liangshan](https://github.com/liangshan),
[@orangain](https://github.com/orangain),
[@Keirua](https://github.com/Keirua),
Clément Camin,
Bob Marteen,
[@dmathieu](https://github.com/dmathieu),
[@fernandes](https://github.com/fernandes),
[@gwmoura](https://github.com/gwmoura),
[@lfilho](https://github.com/lfilho),
[@Arturszott](https://github.com/Arturszott),
[@melikeyurtoglu](https://github.com/melikeyurtoglu),
[@filiphanes](https://github.com/filiphanes)
and [more](https://github.com/heroku/12factor/graphs/contributors).

Released under the MIT License:
https://opensource.org/licenses/MIT
