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The sticker price is the wrong number. The monitors with the best software charge you every single month, and over three years that quietly overtakes the hardware. This page works out the honest three-year cost of each kind of monitor — Wi-Fi with a plan, Wi-Fi without one, and the closed-loop types that never bill you at all.
The full ranking for this page is being finalised. Every product listed here is checked against manufacturer specifications before it is ranked, and this page is updated as models change.