Mongoose Embedded Web Server Library License types

Our license model is simple and includes full access to source code and accompanying documentation.

Non Commercial Project

All non commercial projects can be run using our open source code under the GPLv2 licensing. As long as your project remains in this category there is no charge.


If you are working on a prototype that may lead to a commercial product, you can start off using the Open Source Code under GPLv2 for free. However, once the project is commercialised, you need to change to a Commercial license.

Commercial Application

Once your end device or application is commercial you need to either open the source code of your end product completely to continue using Mongoose Library free of charge under GPLv2 license or alternatively purchase a Commercial license.

If you are unsure which type of license is right for you, contact us to discuss.

Commercial License Benefits

  • The right to develop and modify our software to embed in your commercial products
  • Ability to redistribute your closed source products with Mongoose Web Server Library included
  • Option to access Software Maintenance & Support for updates, upgrades and technical support
  • Proactive security alerts notifications

Commercial License Options

Our license model is built around our customers and their specific needs. It is divided into 3 options:

One Product License

This license covers only one product type commercially positioned and sold to the end customers and modifications of this product in the future

Product Family License

This license covers a group of related products commercially positioned and sold to the end customers with similar functionality and united under one product line

Custom Field License

Custom license for your business across product lines. This model allows us to be flexible and value-driven towards your integration project. Simply let us know the details of your project, and we will provide the most effective license option for you.

Non Compliance and License Incompatibilities

Integrating Cesanta's software in a commercial product without fully releasing your source code or purchasing a commercial license can have legal ramifications. You agree to the terms under GPLv2 as you integrate our source code.

Incompatibilities, through taking different components of different sources and ignoring any license restrictions, can result in the software pieces you choose not to be permitted to be used in a single product.

Frequently Asked Questions

When do I need a commercial license?

Once your product is commercial you need to either open your source code completely to continue using Mongoose free of charge under GPLv2 license or alternatively purchase a commercial license. To enquire about licensing, just get in touch.

So what’s the price?

Our pricing is bespoke to your project. Not every project has the same scale, so we want to be sure you get the right license at the right level needed. Nothing more, nothing less. Click here to get in touch for pricing, tell us more about your project and will then get the price ready for you.

What’s the difference between product and product family licenses?

We work with two broad licensing groups: Product and Product Family.

Is your license royalty-free?

Yes, our license is royalty-free. However, we do understand that this model does not suit everyone. If your needs require a custom license, we’d be happy to work on a solution with you.

How long does the licensing process take?

From Cesanta's side it takes couple of days. But, your company may want to do legal reviews which in some cases can take months. We suggest buying your license 6 months in advance of your product launch.