Fi vs PLUS CYCLE ver. EN
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fi
This app pairs with a smart collar to track your dog's location, monitor their activity and health patterns, and alert you if they leave a designated safe zone. It offers AI-powered insights into your dog's behavior and a lost dog mode for emergencies.
- Real-time GPS dog tracking
- Customizable safe zone alerts
- Activity and health monitoring
- AI behavior insights
- Lost Dog Mode
- Long battery life collar
- Apple Watch integration
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Fi Series 3+ is the world's smartest GPS dog collar—now powered by AI. Paired with a Fi collar, the Fi app brings you even closer to your dog. Track their location, monitor activity and health patterns, and get alerts if they ever leave a safe zone. It's peace of mind for the best pet parents out there. FEATURES GPS TRACKING On vacation? Friend walking the dog? Instantly track your dog's location no matter where they are. Fi gives you the confidence to know they're safe from anywhere, anytime. STOP ESCAPE ARTISTS Designate safe zones around your home or dog's favorite places. If they leave without a trusted person, we'll alert you immediately. So if they wander anywhere, you'll be the first to know. ACTIVITY MONITORING Track your dog's step count daily and start streaks by achieving custom goals you set. Then see how they compare with similar dogs in the Fi community. Every step goes a long way toward keeping them happy and healthy. AI BEHAVIOR INSIGHTS Fi Series 3+ tracks more than just steps. Spot trends in activity, rest, scratching, licking, drinking, eating, and barking so you can stay in tune with your dog's health and habits, every day. LOST DOG MODE Never lose track again. If your dog goes missing, activate Lost Dog Mode to turn on rapidly refreshing live location updates until they're found. BATTERY LIFE With best-in-class battery, our collars lasts up to 3 months on a single charge. No other collar even comes close. SUPPORT Need help? We're here for you and your dog. Our support team is just a chat or phone call away when you need. APPLE WATCH INTEGRATION With our all new Series 3+, you can view your dog's location and activity directly on your wrist, so you're always connected, even without your phone. OUR COLLAR Available in 4 different colors and 5 different sizes to fit dogs of all sizes. Fi works best when connected near a Bluetooth connected device with the Fi App or the provided charging base. The latest iOS version is required to run Fi. Learn more about what we're building at: www.tryfi.com.
PLUS CYCLE ver. EN
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PLUS CYCLE is an activity meter for dogs and cats developed by Japan Animal Referral Medical Center. This app is specially designed to synchronize PLUS CYCLE data and view graphs. This app is the English version of the PLUS CYCLE app.
Screenshots
Verdict
The clearest difference is update cadence: Fi at weekly against PLUS CYCLE ver. EN's every 13 months. PLUS CYCLE ver. EN's advantage is iOS requirement (14.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Fi ships an update weekly, PLUS CYCLE ver. EN every 13 months. The most recent releases landed on November 11, 2026 and November 7, 2026 respectively.
| Parameter | Fi | PLUS CYCLE ver. EN |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (42K ratings) — better | — |
| Positive reviews | 37.9% of reviews | — |
| Number of ratings | 42K — better | — |
| Update frequency | Weekly — better | Every 13 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 17.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 196 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Barking Labs Corp. | 株式会社日本動物高度医療センター |
Bugs and requests
Fi
Reported bugs
3 issues- Collar stops working unexpectedly
- App glitches and crashes
- GPS tracking lags or shows incorrect locations
Requested features
5 requests- Customizable notification settings
- Offline step/distance tracking
- Ability to edit/delete activity data
- More accurate geofencing options
- Integration with other apps (e.g. Wag)
PLUS CYCLE ver. EN
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Fi
No in-app purchases
PLUS CYCLE ver. EN
No in-app purchases









