The editor I used for my Project Sekai custom chart (read desc for more details)

The editor can be found here : It’s a browser app so you don’t have to download anything. For this video I kept the zoom at 1.0 but you can change it if you feel like the notes are too close. I kept the scroll mode on Page Up/Down so it looks a bit weird but the Smooth scroll option makes my computer lag so I can’t use it. There is also a No scroll option but I’m on a laptop and use a trackpad so I don’t have a wheel to manually scroll. This makes this editor a bit annoying to use on laptop but if you have an actual mouse you should be fine. I only showed the chart but placing notes is very simple. You pick the note type on the left, place it where you want and adjust the size by holding and dragging the side of the note. The only thing that’s a bit more complicated is making shapes for sliders. Once you’re done with your chart you can upload it here By the way if you want to make