This site uses real time queries of Arne's fantastic ClickHouse db which means the numbers are always current.
Balloon telemetry is excluded from the calculations but suspected bad decodes are not.
WSRP Challenge and Jim Lills List both remove lone spots that are only reported by one station as probable bad decodes.
That's a good option for HF but not so good for VHF/UHF sporadic E!
But it's too hard to implement using live db queries so these numbers may be a tiny bit higher depending on the bad decode percentage.
Advanced: Save a group of locators to search for.
Open the browser console. On any page but 'band' hold down the altKey/optionKey and click each locator you want to save.
The console view shows them being collected. When finished collecting, click any 'time' button, eg. 'Midnight to now UTC'
A fresh query returns results for the locators in your collection. The collection is saved between pages and reloads.
To clear the collection hold down the Windows/command key and click any locator in the locators column.
•click column headings to sort •click callsign for band summary •click table cells for unique & band spots •click => copy table data to clipboard