Props to @Citruspi on App.Net for alerting me about Droplr’s price change, which led to the discovery of the iOS-web discrepancy.
Basically online Droplr Pro is $59.99/year…
…while Droplr Pro on the App Store is (drum roll please) a whopping $39.99/year!
Why Droplr is charging web users $20 USD more online is perplexing, although they may want to update their iOS app price in the not so distant future. 😉