Update: after getting my iPhone 6 I tested Accupedo again; since its now using HealthKit for steps, accuracy is identical across all apps and my rating has been upgraded to reflect only the apps features and presentation.
And...Im not impressed with either.
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In my limited testing, Im finding that the app is pretty inaccurate. In a test walk of 500 steps (I counted), Accupedo counted 624. But most of the time, the app fails to count a large majority of my steps. An app that I consider to be fairly accurate showed 9700+ steps today, while Accupedo counted only 128.
(Its only fair to note that Im using an iPhone 4S that exhibits low memory conditions; however, the other pedometer apps Im testing appear to handle this more gracefully.)
Two minor issues: the badge count never matches the step count shown in the app and the app doesnt use the standard share sheet thats been around for a year-and-a-half. Ive not used the MyFitnessPal integration, but would (and would upgrade) if the accuracy were better.