runs on web browser - no install required - take a look
settings can be saved and are persistent
can be installed and run as local private server on linux/pi
for me on private server - substantially lower cpu usage (blips at 2-4%) than original hamclock (constant 78%) on an old lenovo 11e (finally a use for this crappy computer) running linux mint 22.2
dock-able layout lets you drag elements around for your own layout