Activity monitors
Fi Series 3 Smart Collar review
Published 20 June 2026
A smart collar that pairs strong activity and rest tracking with sleep-pattern alerts and breed comparisons, in a rugged collar with excellent battery life. Health insights need a subscription, but the hardware and data are among the best.
Best for: Owners wanting a rugged smart collar with deep stats
From £99.00 checked 20 Jun 2026
Check price on Amazon UKWe may earn a commission. It costs you nothing extra.
What works
- Strong activity and sleep tracking
- Excellent battery
- Rugged collar
- Breed comparisons
- Sleep-shift alerts
What falls short
- Subscription for full features
- Heavier collar form
- Premium price
How it scores
We rate every product in this category on the same criteria, weighted by how much they matter in daily use. Each score is out of 10.
| Criterion | Weight | Score | Why |
|---|---|---|---|
| Tracking accuracy | 25% | 8.5 | Tracks steps, calories and rest accurately, with sleep-pattern monitoring |
| Health insights and alerts | 20% | 8.5 | Notifies on shifts in sleep and activity habits; breed and local comparisons |
| Battery life | 15% | 9.0 | Excellent battery life for a smart collar, weeks between charges |
| App experience | 10% | 8.5 | Well-regarded app with goals and comparisons |
| Size, comfort and fit | 10% | 7.5 | Collar-integrated, sturdy but heavier than clip monitors |
| Subscription value and transparency | 10% | 7.0 | Subscription needed for full features; ongoing cost to weigh Confirm on your exact model before relying on it. |
| Durability and water resistance | 5% | 9.0 | Very rugged, water resistant, escape-resistant collar |
| Value | 5% | 7.5 | Premium price plus subscription, justified by build and data |
| Weighted total | 8.3 |
How we score: each rating combines the manufacturer specification with the weight of feedback from owners and independent reviewers. We do not copy other reviews. The score is our own synthesis, and we show the reasoning so you can judge it yourself.
See how the Fi Series 3 Smart Collar ranks against other activity monitors
Key specifications
| Form | Smart collar |
|---|---|
| Tracks | Steps, calories, rest, sleep patterns |
| Battery | Weeks |
| Extras | Breed and local comparisons |
| Subscription | Required for full features |
| Build | Rugged, escape-resistant |
Common questions
Does the Fi collar track sleep?
Yes, beyond steps and calories it monitors rest and sleep patterns and notifies you of shifts in sleeping and activity habits, which can be useful early health signals.
Is there a subscription?
Yes, full features need a subscription, the main ongoing cost to weigh against subscription-free monitors like PitPat or FitBark, though the build and data are excellent.
How is the battery life?
Excellent for a smart collar, lasting weeks rather than days, helped by efficient power management.
Looking at something else? See our gps trackers