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Buying things on the internet can save you a lot of money if you wait for a good deal to come along, but you could be out of luck if you don't hop on a hot deal fast enough. Fluctuate is a new app that tracks prices for things you want to buy, and pushes alerts for pricing changes. The basic functionality is free, but several advanced features will cost you.
There are two ways to add items to Fluctuate. You can either share a URL to the app via Android's built-in permission system, or you can open the app and tap the floating action button to paste a URL manually. Fluctuate reads the page and looks for a price, which it usually finds. You have the option to tell the app that the detected price is not the correct one. In that case, the app loads the page, and you can tap on the name of the item and the price to correct the record.
With your item set up in the app, you'll see a notification in the event the price changes… at all. Depending on the site, that might mean a lot of notifications. You can, instead, set a threshold at which you'll receive a notification. Each item on your Fluctuate list shows the current price, and tapping on it lets you buy or view the product. When selecting "Buy now," the app will track how much you've saved based on the price drop since an item was added to the list. That running tally appears at the top of the app.
All of this functionality is free, and there are no ads in Fluctuate. The app will track pricing data over time for your saved items, but you can only see the graph if you upgrade to the pro version for $3.49. There's a separate $1.99 IAP for backup and restore support. That lets you save your tracked items so you won't lose them when migrating to a new device. If you want both, there's a single $4.99 everything upgrade.
Fluctuate has performed well for me with a variety of sites including Amazon, the Google Store, and B&H. I think the IAPs are a bit high, but the free functionality is already very solid. It would have been easy to toss some contextual ads in Fluctuate, but the devs didn't do that. Thumbs up there.