Lesli

Lesli is a SaaS Development Framework designed to help you build highly scalable, secure, and customizable software products with ease.

It’s built on top of industry-proven technologies like Ruby on Rails, PostgreSQL, Hotwire, Bulma, SASS, AlpineJS and many other fantastic open-source libraries, gems, and tools.

Lesli provides a robust set of built-in features and a standard process for extending its capabilities through modules, making it easy to create your own custom components when needed.

Lesli goes beyond being just a starter kit or boilerplate. It’s a Ruby on Rails-based core gem that enables you to build modular applications (a.k.a. engines) by leveraging its built-in features, generators, components, and industry best practices. With Lesli, you can easily extend existing functionality or develop fully customized solutions tailored to your specific needs.

Why Lesli?

Lesli is fully open source and comes packed with tools and features that can save you months of development time. Thanks to its modular architecture, you can seamlessly extend Lesli’s functionality by adding pre-built modules — allowing you to get your SaaS product up and running in minutes.

Lesli is published under the GNU General Public License version 3 (GPLv3). This means you’re free to use, copy, redistribute, and/or modify Lesli, as long as you comply with the terms of the GPL.

How Does It Work?

Ruby on Rails

Ruby on Rails (commonly referred to as Rails) is a popular open-source web application framework written in the Ruby programming language. Rails follows the Model-View-Controller (MVC) architectural pattern, providing developers with a structured, efficient approach to building web applications.

By using Rails as its foundation, Lesli benefits from Rails’ mature ecosystem, conventions, and built-in features. Rails simplifies common tasks such as routing, database management, and user authentication, allowing developers to focus on building the core functionalities of their SaaS applications more efficiently.

SaaS Framework

In the context of SaaS development, Lesli leverages Ruby on Rails to deliver scalable and customizable software solutions accessible through the web.

SaaS (Software as a Service) is a delivery model where applications are centrally hosted and offered to customers as a service. This model eliminates the need for users to install or maintain software locally — everything runs in the cloud and is accessed through a web browser.

Lesli’s architecture and tools are purpose-built to support this model, enabling developers to build robust SaaS applications faster and more efficiently.