Just a small feedback: I scrolled through 3/4 of the page and still have no clue what is the product. An integration to other apps? A twitter bot? A separate app like Anki? A website version of Anki?
Okay, I have to admit that I misunderstood you product, and my original comment was unnecessarily harsh.
If the content stays in the original apps I would highlight that on the landing page, as that's not really obvious (at least to me), and goes counter to how most apps operate.
What about the study progress? To a lot of SRS people study progress is almost as precious as the cards themselves.
You have 4 algorithms to choose from currently (SM2 is one of them) https://neuracache.com/spaced/
+ I am working on SRS editor that will allow you to define your own intervals.
You can quickly access your decks via tags/notebooks etc
The parent comment has a point, I opened the homepage and searched for the word "data", 0 results found. Perhaps adding something along the lines of "Stay in control of your data with ..." would be a selling point?