How do you compare App Store subscription prices across countries?

We’re building AppPriceLens to make App Store pricing transparent across regions.

Instead of checking storefronts one by one, you can see an app’s subscriptions and IAPs on a single screen and quickly spot the lowest-price storefront.

You can also search your own app and fetch pricing data to compare how it looks across countries.

I’m curious: how do you handle this today, and what’s the hardest part?