Searching for a way to track your dog's activity usually surfaces two very different kinds of product, lumped together as if they compete head-to-head: GPS collar trackers (Fi, Whistle, and similar hardware that clips onto your dog's own collar) and phone-based apps like Hapoo, which read your own phone's motion sensor instead. They're worth comparing honestly, because they're not actually solving the same problem.

Picking the wrong one for what you actually need is the real risk — not picking "the worse product."

What a GPS collar is actually for

A GPS collar's core job is knowing where your dog is without you there — if your dog gets loose, digs under a fence, or slips a lead, a collar with its own GPS and cellular radio can tell you where they went. That's a genuinely different problem from tracking a walk you're both doing together, and it's the one thing a phone-based app structurally cannot do: your phone only knows where you are, and on a walk, that's the same place your dog is anyway.

The cost of that always-on location capability is real: collar trackers need their own battery (typically a few days between charges), their own cellular data plan (usually a recurring monthly subscription on top of the hardware cost), and physical hardware on your dog that can be lost, damaged, or chewed off entirely by a determined enough dog.

What a phone-based motion tracker is actually for

Hapoo's job is different: noticing the walk you're already doing together and giving you credit for it, without adding hardware, a subscription, or a device your dog has to wear. It reads your phone's own motion coprocessor — see the full explainer on how that works — to detect that a real walk happened, rather than tracking continuous GPS location the way a collar does.

The trade-off runs the other way from a collar's: Hapoo can't tell you where your dog is if they're not with you, because it was never built to. It has nothing to say about an escaped dog, because escaping is, by definition, the one scenario where your phone and your dog aren't in the same place. What it's built for instead — turning the walk you're both already doing into points, streaks, and a reason to keep doing it — a collar's GPS chip has nothing to say about at all.

Where they genuinely overlap, and where they don't

GPS collar (Fi, Whistle, etc.) Hapoo
Knows dog's location without you Yes No — not its job
Needs hardware on the dog Yes No
Recurring subscription for tracking Usually, for cellular data No
Counts a walk you're both doing together Indirectly, via GPS Directly, via motion
Battery cost of daily use A dedicated device, charged separately Runs on your existing phone, no extra GPS drain — see how
Gamifies the walk itself Not typically the focus The entire point

If what you actually need is "tell me if my dog gets loose," a GPS collar solves a real problem Hapoo doesn't attempt to touch. If what you actually need is "give me a reason to enjoy and keep up the walk we already take together," that's the problem Hapoo was built around, and it's not one a collar's always-on location radio was designed to solve either.

Can you reasonably use both?

Yes, and for a lot of owners that's the honest answer rather than picking one. A collar covers the "where did they go" scenario a phone fundamentally can't; Hapoo covers making the daily walk itself feel worth doing, at zero extra hardware or subscription cost on top of a phone you already carry. They're not really competing products once you look at what each one is actually solving.

See the full feature list for everything Hapoo does with the walk once it's counted, or how it's built for the technical shape of the motion-based approach specifically.