Does the Amazon history price checker by URL actually work for tracking past prices? or How reliable

I feel you! Some of those tools are super glitchy.

I’ve had good luck with Keepa—it’s a browser extension that tracks Amazon price history. Shows you the lowest price ever and lets you set alerts.

Also, Honey sometimes has price history features, though it’s not as detailed.

Just avoid the ones that ask for your Amazon login. No need for that!