Crystal Math Labs offers an XP tracker for Jagex's Old School RuneScape and RuneScape 3. Using the OSRS hiscores, it allows you to monitor progress of your experience, levels and rank. This website is currently tracking 1,271,921 Old School RuneScape players with 151,419,263 datapoints since this site's launch on February 23, 2013.
If you wish to track RuneScape 3 players, click the RS3 link on the top right of any page.
Gold and silver crowns next to a player's name on this website do not indicate their moderator status in RuneScape. You can hover your mouse over any player's crown to find out why they have the crown. Here's a list of players with crowns:
Developer: Mr. CML
If you're interested in donating, click here.