Is the
Disneyland one accurate?
Hit or miss, if you ask me. And the "misses" were almost laughably so during our trip about 2 weeks ago. Saw a 15min wait posted on the app for the little coaster in Toon Town, went there and watched the 2 CM's putting out extra posts/rope to extend the queue. I made a comment to one about the "15min wait" and he said, "Oh, yeah, this is more like 40, 45min. We'll update the app." While I understand you will always have a bit of unpredictability as crowds surge, etc, that was pretty silly. It didn't go from 15 to 40 in the span of a couple minutes, and the CMs were clearly unaware of what the app said, not to mention it would be at least a few more minutes before they got around to updating the app. You're better off asking a CM near the back of the line, b/c they'll know more than the app!
The fastpass info was more accurate than wait times, but be forewarned that you'll need to move quickly if you see a time you want. Usually when we saw a time we liked for a non-high-demand ride, we hightailed it, but typically by the time we got there, it was an add'l 20min or so into the future. This wouldn't apply to RSR or other high demand rides.
I originally had another wait time app on my phone, but I decided I would make myself nuts to constantly cross-compare the two. Plus I had terrible connectivity in the parks. In the future I will just plan to eyeball it and look at the signs AT the rides, most likely.