Routecheck.cc

Can you edit on there?

Like dragging control points around? I'm a bit leary of going down that rabbit hole, sounds like a whole lot of work which RWGPS has already nailed. It would be nice to make small tweaks to a route though, like just switching a segment from one road to another.

For now I work in two tabs - RWGPS editing in the other. When RWGPS route is saved, I just refresh the routecheck tab.

Might be worth getting OSM cycle tracks, if you haven't.

Do you mean OpenCycleMap tiles, or something else? In the Map tab you can choose a different base map. It's easy to add other maps in, see https://leaflet-extras.github.io/leaflet-providers/preview/ for options.

Also if I upload my GPX, are they secure and private?
Same with my log in data?

The GPX file never leaves your computer - it's read right into the browser and doesn't get stored anywhere. EDIT: Login details now go direct to RWGPS over SSL - the only thing stored are settings and username in your browser only.

tl;dr nothing ever stored on the server, settings and username stored in browser only, everything encrypted in flight.