Brainscape looks like another huge app with promotions like "The ultimate study weapon." and "Use AI to find or make flashcards from any source. Learn faster with spaced repetition." Let's see what I think of it!
Well, a lot of YouTube videos. They like to make these.
Millions of users. Scientifically backed methods.

- Create your own word list. Example: "Days of the week in French"
★ One free if successful - YES
★ Easy to start creating - YES
★ Easy to make a long list - YES
★ Easy to use with keyboard only - YES
★ Automatic translations - NO - but it shows a lot of AI options
Score: 80

- Select an existing list + AI
★ Easy to select, find options - YES
★ Select a decent list - YES - a lot of lists are only accessible with premium
★ Have more options to choose from - YES
★ Generate a list using AI - YES
★ Take over a list from an image - NO - I expected this one but really couldn't find it
Score: 80

- Learn this list. Error hard on the first three. Error a bit on the next two. Make the last two perfect.
★ I can learn - YES
★ I have multiple options to answer: flashcard, write the words down - NO - unexpected, but I only found flashcard mode
★ The errors are repeated until answered correctly - YES
★ There is a prompt to rehearse again in time - YES
★ After the right period of time, the questions are asked again - YES - proper spaced repetition
Score: 80

- Easy to use rating
★ Modern app, looks smooth - YES
★ Good-looking, nice colors/logo or something - YES - clean colors, material design
★ Easy to start, no hiccups - YES
★★ Easy to do the actions above - YES, no complaints
Score: 100, a perfect score, but there is no "first love" for the design.

- Try to share, import, and export a list
★ Share one list easily, e.g., by URL - BIT - Strangely enough, from your profile, you can navigate to a single list
★ Share all your lists easily - YES - you can share your profile. It is public. You need a pro account to make it private
★ Export your list in an understandable format - YES, easy CSV
★ Import a list from an easy-to-create format - YES, quite nice. You can even fix the result with AI
★ Export all your lists at once - YES (MOSTLY) - you can easily export a single "Class" (one subject)
Score: 90

- Special features
★ A lot of courses - making content together
★ AI generation - make flashcards from notes/PowerPoints/videos
★ Create your own course from your decks
Score: 60

- Gaming elements
★ Progress bars
★ Confidence scores
Score: 40 - I expected just a bit more. It is a serious app.

- Pros
★ Sharing with a class - make courses together
★ Proper spaced repetition
★ A lot of classes in various subjects
Score: 60

- Cons
★ No multiple ways to learn (e.g., no write-down option)
★ Slow. Some really basic actions took time (e.g., just making an empty deck—I even got a gateway timeout once)
★ Free version has some serious limitations. E.g., you cannot learn languages both ways.
Score: 60

- Price
Freemium model. Limited free version, Pro version for $8 per month.
Score: 40

Overall:
A very decent app to help you learn. The option to write down an answer while learning is really missing. If you want to learn words in a foreign language, this is a really effective option. I don’t see a reason why it is missing. I am also missing some elements to make learning a bit more fun. If Brainscape is all you know, you would be really happy with it. For most users, I don’t expect Brainscape to be the best app.