New Features
I've added (or will shortly add) new features such as history, starring vocabulary items, writing notes, substituting translations etc. and these will need a login. Additionally, the parser is more accurate, some words have usage notes, and I'll be adding Japanese lessons etc.
Costs
In short, with the majority of users using adBlockers (which I understand) the running costs, which are substantial, are no longer covered by the ads. Also, there are issues with robots sending huge numbers of translation requests which a login system will prevent. In simple terms, it meant last year I was paying out of pocket to keep the site running!
No more ads for most users
Ads aren't a good experience anyway, so they are permanently removed for users who donate.
Mobile App?
As the site is now mobile friendly, there is no need to have an app (although I may make one in the future). So essentially, it works like an app.
Future Updates
I'm committed to continually improving the site, and will continue to add new features such as speaking practice, example sentences, flash cards, grammar lessons, etc.
Thank you for your understanding,
Gary
PS: The old parser is now permanently closed.