Just tried Toucan and it can't be disabled on localhost, a major pain for using it during work as an engineer. For those that haven't used toucan, it's an extension that translates words/phrases inline on a page with various levels of replacement frequency and complexity based on your proficiency with the language.
This [1] help article says that it's free. Not sure how much we should trust that though. Did you find a better source?
Nice idea - although I hate having to start from scratch and having to "train" the system to know my level and vocabulary. I think it's a bummer that it's not common to be be able to exchange vocabulary lists between apps.
I wasted 10 minutes trying to find the pricing page. There’s no way I’m going to use an app that deliberately hides the pricing information.