I am the author of this Dual Sub Chrome Extension: https://chromewebstore.google.com/detail/learn-finnish-dual-subtit/olmapcjpickcoabnjleheppoignffpdd .
Here is landing page: https://finnish-streaming-dual-sub.netlify.app/ and demo video: https://www.youtube.com/watch?v=O3B7BCvd99Y
It is an open-source project, translates Finnish subtitle to other languages. Users need to register to DeepL system and get DeepL token / translation key. By this way, motivated users can get their own key and the project can live well without active maintenance from my side. Now my app gets more than 250 installations without marketting.
I'd like to raise one concern regarding the recent pricing changes. The Free and Pro tiers have been replaced by Developer and Growth, with Growth costing €29.75/month for 1 million characters. For individual language learners, 150,000 characters per month is typically more than enough — making the Growth tier feel disproportionately expensive.
Would it be possible to introduce a more accessible B2C tier? Something like a €5 base price with pay-as-you-go for extra usage would make a real difference. It would also help greatly if users could purchase translation keys via Google Pay, Apple Pay, or PayPal — credit card requirements can feel intimidating for individual users and create unnecessary friction.