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Fi and Tractive are the two names that come up in almost every dog GPS tracker search. Here’s an honest, side-by-side look at price, subscription, battery, coverage and features, so you can pick the right one for your dog.
If you’re shopping for a dog GPS tracker, you’ve almost certainly narrowed it down to Fi and Tractive. Both are cellular trackers with live location, virtual fences and activity tracking. Both need a subscription. And both have loyal fans who’ll tell you theirs is obviously better.
The truth is that they’re built around different priorities. Tractive’s DOG 6 is the cheaper, more feature-packed option. Fi’s Series 3+ is the premium, low-maintenance option with far longer battery life. Which one is better depends on your dog, your budget, and how much you’ll put up with charging.
Quick verdict
Choose Tractive if you want the lowest total cost, multi-carrier coverage and vital-sign monitoring. Choose Fi if battery life and durability matter most and you’re happy to pay more for a tracker you can mostly forget about. Over two years, Fi costs roughly twice as much.
Fi vs Tractive: Side-by-Side
| Feature | Tractive DOG 6 | Fi Series 3+ |
|---|---|---|
| Device price | $79 | $129 (promos may lower it) |
| Cheapest yearly plan | $108/year | $189/year |
| Other plans | $120/yr Premium, $168/2 yrs, $300/5 yrs | $99/6 months, $339/2 years |
| Battery life (rated) | Up to 14 days with Power Saving Zones | Up to 3 months; 1.5 to 2 months typical |
| Live tracking | Updates every 3 seconds | Lost Dog Mode for near-continuous tracking |
| Network | LTE-M + 2G via AT&T, T-Mobile, Verizon | Cellular LTE |
| Waterproof rating | IP68 | IP68 and IP66K |
| Health features | Activity, sleep, bark, scratch, resting heart and respiratory rate | Activity, sleep and behavior tracking (Fi lists barking, scratching and eating) |
| Build | Clips onto your collar | Stainless steel body, 7-color night light |
| Countries covered | 175+ | Fewer (Fi lists 35 for its Mini) |
| Trial | 30-day money-back guarantee | 30-day risk-free trial |
Prices are from each brand’s US site and help center as of October 2026. They change often, especially around Black Friday, so confirm before you buy.
Price and Subscription: Tractive Wins Clearly
This is the biggest difference between the two, and it’s not close. Here’s what each costs if you buy the device and the cheapest plan for each period:
| Ownership period | Tractive DOG 6 | Fi Series 3+ |
|---|---|---|
| First year | $187 ($79 + $108) | $318 ($129 + $189) |
| Two years (2-year plan) | $223 ($79 + $144) | $468 ($129 + $339) |
Over two years, Fi costs about twice as much as Tractive. If you want Tractive’s health features on its Premium plan, the gap narrows a little ($199 in year one, $247 over two years), but Tractive is still far cheaper. Fi does run promotions that lower the device price, so check current deals, and see our Black Friday tracker deals guide if you can wait.
Battery Life: Fi Wins Clearly
Fi rates the Series 3+ at up to 3 months per charge, and says most dogs get 1.5 to 2 months in normal conditions. Tractive rates the DOG 6 at up to 14 days with Power Saving Zones and up to 6 days without.
In practice, that means charging Fi every month or two versus charging Tractive every week or two. It sounds minor until the one night your dog gets out and the tracker is sitting on the charger, or dead on the collar. If you know you’re forgetful, this alone can justify Fi’s higher price.
Coverage and Tracking: Tractive Has the Edge
Tractive connects through more than 500 network partners, including AT&T, T-Mobile and Verizon in the US, and falls back to 2G where LTE-M isn’t available. Being able to use whichever carrier is strongest is a real advantage in patchy rural or suburban areas. It also works in 175+ countries, which matters if you travel with your dog.
Fi uses cellular LTE plus 4 satellite systems for positioning, and its Lost Dog Mode switches to near-continuous location updates when your dog leaves a safe zone. It’s very capable, but before buying either tracker, check the coverage map for your home and the places your dog actually goes. Our GPS accuracy guide explains what affects real-world precision.
Health Features: Tractive Adds Vital Signs
Both track activity and sleep, and both brands advertise behavior insights like barking and scratching. The difference is vital signs: Tractive’s DOG 6 also measures resting heart and respiratory rate. Tractive says it needs about seven days of wear to set a baseline and is clear it isn’t a medical device. If heart and breathing trends interest you, Tractive has the edge; if you only care about location, this difference won’t matter.
Durability and Design: Fi Feels More Premium
Fi’s Series 3+ has a stainless steel body, an IP68 and IP66K waterproof rating, and a built-in night light with 7 color options. Tractive’s DOG 6 is also IP68 waterproof and clips onto your existing collar, which makes it easy to move between collars. Both handle swimming and mud well; Fi’s build is simply more rugged and designed to be worn 24/7 without much attention.
Small Dogs: Neither Is Perfect, but Fi Has an Option
Tractive recommends the DOG 6 for dogs above 9 lbs, and at 1.4 oz it can feel bulky on toy breeds. Fi’s Series 3+ is also sized for typical collars, but Fi sells a separate Fi Mini that weighs 0.56 oz and is aimed at small dogs. For more options, see the best GPS trackers for small dogs.
Which Should You Buy?
Choose Tractive DOG 6 if you:
- Want the lowest upfront and ongoing cost
- Live somewhere with patchy coverage from a single carrier
- Want health insights like resting heart rate, barking and scratching
- Travel internationally with your dog
- Don’t mind charging every week or two
Choose Fi Series 3+ if you:
- Want to charge once every month or two, not every week
- Want the most rugged, set-and-forget hardware
- Mostly care about location and escape alerts, not health data
- Are comfortable paying roughly twice as much over two years
Still unsure? Read our full Tractive DOG 6 review and our honest Fi buyer’s guide for a deeper look at each.
Frequently Asked Questions
❓ Is Fi or Tractive better?
Neither is better for everyone. Tractive is cheaper, measures resting heart and respiratory rate, and has wider carrier coverage. Fi has much longer battery life and a tougher build. Pick Tractive for value and Fi for low maintenance.
❓ Which is cheaper, Fi or Tractive?
Tractive. Its first year costs about $187 ($79 device plus a $108 plan), compared with about $318 for Fi ($129 device plus a $189 yearly membership). Over two years, Fi costs roughly twice as much.
❓ Which has better battery life, Fi or Tractive?
Fi, by a wide margin. Fi rates the Series 3+ at up to 3 months per charge (1.5 to 2 months typical), while Tractive rates the DOG 6 at up to 14 days with Power Saving Zones.
❓ Do Fi and Tractive both need a subscription?
Yes. Both require an active plan to send location to your phone. Tractive’s plans start at $108 a year, and Fi’s memberships start at $99 for 6 months or $189 a year.
❓ Which is better for a small dog?
Tractive recommends the DOG 6 for dogs above 9 lbs. For very small dogs, Fi’s lighter Fi Mini (0.56 oz) or another small-dog tracker is usually a better fit.
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The SmartPetPick Team researches and compares GPS dog trackers, smart collars, and pet safety technology. We dig into manufacturer specs, subscription pricing, independent reviews, and real owner feedback so US dog owners can choose with confidence.