> The open source license is designed for you to use Isotope to build open source and personal projects. The Isotope open source license is GPLv3. The GPLv3 has many terms, but the most important is how it is sticky when you distribute your work publicly. From the GPL FAQ:

>> If you release the modified version to the public in some way, the GPL requires you to make the modified source code available to the program's users, under the GPL.

> Releasing your project that uses Isotope under the GPLv3, in turn, requires your project to be licensed under the GPLv3. If you are okay with this, feel free to use Isotope under the GPLv3, without purchasing a commercial license.

https://isotope.metafizzy.co/license.html#open-source-licens...

Isotope's code is available under GPLv3 with no further restrictions. Although the page says that the project's use of GPLv3 is "designed for you to use Isotope to build open source and personal projects", it does not say that Isotope cannot be used for commercial projects under GPLv3.

I shudder at these confident, definitive statements when they're off the mark this far. It's not just "freeware" when you can see, modify, sell and redistribute under the same licence. It's open source.