First-Time Fitness Tracker Buyer's Guide for Traditional Watch Wearers
Most fitness tracker buying guides assume you're starting from scratch — empty wrists, no strong aesthetic preferences, just looking for the best health data for the money. If you wear a traditional watch, that's the wrong guide for you. Your decision framework is different, the options that make sense are different, and the questions you need to answer before buying are different. This is the guide for your situation.
Question 1: What do I actually want from fitness tracking?
Before choosing a device, get specific about your goal. Are you primarily interested in step and activity tracking? Do you want calorie data to inform your diet? Are you looking for athletic performance metrics like heart rate zones and workout detection? Do you want sleep data? Notification management? The clearer you are about what you actually want, the less likely you are to overpay for features you won't use or underbuy for features you need. Most everyday fitness trackers users primarily care about steps, active time, and calories. More advanced metrics are valuable for serious athletes. Know which camp you're in.
Question 2: Am I willing to replace my watch or add a second device?
This is the fundamental fork in the road for watch wearers. If you're open to wearing a second device on your other wrist — dual-wristing — your options expand to include any standard fitness tracker. If you want only one device on your wrists, your options narrow to: smart ring (moves to finger), phone-based tracking (no additional hardware), or a caseback tracker (sits under your watch). Most people who care enough about their watch to ask this question end up preferring solutions that don't add another wrist device.
Question 3: How important is subscription-free?
Run the three-year math before deciding. WHOOP at $199/year costs $597 over three years. Oura at $5.99/month adds $215.64. A one-time purchase device at $150–$200 costs exactly that, total. If you're tracking fitness as a background habit rather than a performance-focused investment, paying ongoing subscription fees for access to your own step data is difficult to justify. Know what you're signing up for before you sign up for it.
Question 4: What watch am I most likely to wear every day?
The answer determines the form of your tracker. If you rotate between multiple watches, you want a tracker that travels with you between them. If you have one primary daily driver, a tracker optimized for that specific watch makes sense. If you frequently remove your watch — for the gym, for formal events — your tracker needs to work independently too, or you'll have data gaps on those days.
Understanding your options
Smart ring (Oura, Ultrahuman): Best for people who want to avoid the wrist entirely. Socially invisible, compatible with any watch, tracks activity and more. Downside: subscription cost (Oura), ring format not suited to everyone, higher total price.
Phone-based tracking: Zero additional hardware. Works if your phone is on your person most of the day. Underestimates activity when the phone isn't with you. Free.
Dual-wrist tracking: Adds a fitness band to the non-watch wrist. Works technically, creates visual imbalance, limits outfit choices. All standard fitness trackers apply.
Caseback tracker (the Heir): Attaches under your existing watch, completely invisible. Tracks steps, calories, active distance, active time, activity classification. Delivers notifications via vibration. No subscription. Transfers between watches. Best fit for people who want fitness tracking that works with their watch rather than alongside or instead of it.
What's the right choice for most traditional watch wearers?
If your primary goal is reliable activity and step tracking with no aesthetic compromise, no wrist conflict, and no subscription — the Heir is the product built for exactly that situation. It's not trying to replace your watch or compete with it. It works with it. Reserve the Heir here and finally solve the problem you've been working around for years.