IOS App vs. platform (costs)

Hi, I want to upgrade my account and get the premium version of lingq. I’m a little a confused, as the App, at least the IOS version in the AppStore, costs 117€ a year while on the website the premium account costs 10 € less (107€ for 12 months). As both, the app and the website get synch., both should cost the same. So what is the actual price for the upgrade?

We try to maintain similar prices across markets and platforms. But, there are many factors that can affect prices in different markets and on different platforms like exchange rate fluctuations, taxes and fees.

thank you for the prompt reply