Thanks! My design is the one on the website. The neo-brutalism was done by a junior designer who was looking for her first project and she did extremely good job!
The real delight point for me was how painless it was to mark 700 words as already known and pickup a bunch of fairly common words i am not comfortable using (like “allerdings” and “eigentlich”) using that scroll-to-set-learned control.
That one took 3 completely different iterations and bunch of tweaking to get right. For example, when you open in, it scrolls a bit to the first word. When it did not scroll, a friend of mine was looking at it helplessly, trying to scroll on the left side with no success. UX is so difficult.
FWIW the one on the website is much cleaner, self-consistent and overall more pleasant to look at it. The one in the app (at least the iOS one) is a clear step down. Just 2c.