This tool analyses a single WWS parse for an Affliction warlock. It does so on the basis of the length of the fight, not the health of the boss, so its figures are estimates at best. Use it to compare your own results from week to week, or to find out if you're doing it wrong. The best parses to use are on static fights like Patchwerk, but it can also be useful to see how you're doing on more mobile fights. Sartharion is a good example where you should be able to get close to Patchwerk uptimes with the right tricks (hint: Demonic Circle). The analysis is independent of damage done, and thus independent of your gear level, but doesn't look at skill issues like trinket use at all.
Note: This tool is in development. It only works on links to WWS parses for affliction locks. When WWS is busy, it will fail. Try again!