I believe I used
this site back in the day.
I've used it fairly extensively, though not recently. It's the best I've come across. It's ideal for Bible memorisation, because it (unlike Anki, see below) forces you to be word-perfect or roughly so. Actually writing out verses or passages with it is much better than just remembering them. And it does use (crude) spaced repetition, which is key to effective memory work.
That was before I knew about Anki. I haven't used Anki for Bible memory; it is an amazing app, though it simply does what anyone can do for themselves if they understand the concept of spaced repetition (which I intuitively understood long before ever using a memory app).
Anki is stunning, just brilliant, and it's transformed my Greek/Hebrew/Latin/Modern language learning. It makes vocab learning in particular far easier. Its spaced repetition is really excellent.
But, while it has its uses in Bible memory, I don't find it ideal for memorising passages or verses - it's like a paper flashcard, so a card might ask you what a verse or passage says. That means it's far too easy to mark yourself as remembering something when you actually got only the gist and made mistakes, or to rush through, and so on.
Where I find it helpful is memorising verse
numbers. I have cards that test me on what certain chapters are about, or what certain verses are, and vice-versa, what the verse number is of a particular verse, and so on.
So I'd personally use the app above for most Bible memory, while for broader Bible knowledge Anki is better.