Screenshots coming soon
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Keep an eye on the things you want to buy. Paste a product link from a shop, the PlayStation Store or Steam, in any region, and see where each item is cheapest right now, converted to your own currency. Sales show when they end, and the lowest price you've seen tells you whether the deal is actually any good.
Like every app here, it installs straight from your browser. Open it on mobile and add it to your home screen to use it as an app.