This app was mentioned in 5 comments, with an average of 1.40 upvotes
SSTrain is like an app to practice. It's pretty similar to Deresute's live mode, even tho i think it's a bit harder because you need to be more precise in SSTrain. Here's the link if you're on Android.
About speed, i think you just need to try to change your speed until you find the speed that suits you the most. (Idk much about this, sorry >.<)
Sometimes the gold training ticket gets higher drop rate chances, maybe you would like to save some hearts until then.
If you're on android, there's an app for that. Shameless self-plug. And if you're on iOS, you'll have to wait for a bit until /u/KorSnack finishes working on the port.
the closest thing is sstrain, i guess? it seems kind of difficult to set up, but here: https://play.google.com/store/apps/details?id=com.fteams.sstrain.android
I made the chart for SSTrain. This is an app that imitates the live function, allowing you to practice any song. Sadly it's outdated, but I made the chart and decided to share it.
You can download the chart here. Be sure to look at the app wiki.
Now go for that Full Combo ;)
EDIT: Fixed a hold note that was breaking even when pressed, the map should be FC-able now (the last "3,2,1 Fight!" (4 pairs of slides) is really difficult to do, I can do it in-game but I miss it most times in the app. I guess the app can't handle simultaneous/same spot slides)
Is it sstrain?
I personally can't get it to work though...