From https://juce.com/get-juce "JUCE is dual licenced under both the JUCE licenc...

diskzero · on Sept 11, 2021

Pricing isn't too bad if you don't want to go the GPL route.

If your funding or revenue is $50k and under, there is no cost, but there is a "Made with JUCE" splash screen.

If your funding or revenue is $500k and under, $800 one time fee and there is no splash screen.

You can pay $2600 once with no revenue or funding limit and no splash screen.

Free for education.