Choose Fitbit Air if you want a lower reported upfront price and a lighter, more compact band; choose Luna Band if you prefer its broader haptic alerts and want the included features without a subscription. Both offer basic functionality without a required subscription, but some advanced Fitbit features require paid Google Health Premium. Prices and specifications below are reported figures, not guaranteed current listings.
1. Upfront price: Fitbit Air is reported to cost less
Tom’s Guide reported on September 20, 2026, that Fitbit Air cost $99 and Luna Band cost $149. Tech Advisor’s September 2026 review listed Fitbit Air at £84/$99 and Luna Band at £129/$149. These are dated, source-reported prices; check the current listing and currency for your market before buying.
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| Tracker | Tom’s Guide, September 20, 2026 | Tech Advisor, September 2026 |
|---|---|---|
| Fitbit Air | $99 | £84/$99 |
| Luna Band | $149 | £129/$149 |
At those reported prices, Luna costs $50 more in the US. Whether that difference matters over time depends partly on which features you want, since the subscription terms are not the same.
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Both trackers provide basic functionality without a required subscription, according to Tom’s Guide and Tech Advisor. Fitbit’s more advanced features may require Google Health Premium, so the total cost depends on whether you want those paid extras. Luna is presented as including its features, including personalized AI insights, without a subscription.
#1 Best Overall
- 【All-day Activity Tracker】: ENGERWALL IP68 Waterproof fitness tracker can record and track your daily steps, calories burned, exercise distance and time. It can also monitor your Body Temp, Heart Rate, Blood Oxygen and Blood Pressure. IP68 waterproof ensures that you don't need to take it off for daily hand washing and swimming, but don't soak it in water for a long time or wear it for hot baths, saunas.
- 【Slim and simple band design】The design concept of this tracker’s band is slim and unique, offering a comfortable and lightweight wearing experience. Suitable for men, women and the elderly.
- 【Heart Rate Monitor and Sleep Tracker】: Smart tracker can detect heart rate, blood pressure, blood oxygen, and body temperature in daily life. Monitor your sleep and analyze your sleep quality through Fall Sleep, Deep Sleep, Light Sleep, REM Sleep. You can view daily, weekly, and monthly data in the APP "Runmefit" to help you better understand your health status and lead a healthy lifestyle. [IMPORTANT] The blood pressure measurement feature must be downloaded and enabled within the app.
- 【Call and message notifications】: You can receive text messages and SNS notifications (including Facebook, Twitter, WhatsApp and Instagram) directly on your wrist. When your phone's Bluetooth is turned on, if you receive a message, the watch will vibrate to remind you and you can view the specific message. This function is very practical whether in work or life.
- 【Working Time】: Smart Fitness Watch is the best partner at work, you can set it on the mobile APP ‘Runmefit’: up to 5 sets of alarms, you don’t have to worry about being late for appointments or forgetting important things. You can set drinking Water Reminders and Sedentary Reminders to establish a healthy way of working.
3. Battery life: advertised estimates, not equivalent test results
Tom’s Guide reported ratings of up to 7 days for Fitbit Air and up to 10 days for Luna Band. Dan Bracaglia noted that he had not personally verified Luna’s battery claim in his September 20 comparison. Tech Advisor’s September 28 hands-on review also reported up to 10 days for Luna, but that rating should still be read as an estimate rather than a guarantee for every wearer or usage pattern.
4. Size and weight: Fitbit Air is the lighter option
Tom’s Guide describes Fitbit Air as lighter and more compact, giving an approximate weight of 14 g for Fitbit Air and 26 g for Luna Band. Tech Advisor gives Luna’s weight as 24 g, so published figures for Luna differ. The practical comparison is clearer than the precise number: Fitbit Air is reported to be the lighter, smaller band.
Rank #2
- Fitbit Charge 6 tracks key metrics from calories and Active Zone Minutes to Daily Readiness and sleep; move more with 40+ exercise modes, built-in GPS, all-day activity tracking, 24/7 heart rate, automatic exercising tracking, and more[1]
- See your heart rate in real time: Just link your Charge 6 to compatible exercise machines, like treadmills, ellipticals, and more[2]; and stay connected with YouTube Music controls[3]
- Tune into your body: Track your response to stress with a stress management score; learn about the quality of your sleep with a personalized nightly Sleep Score; and wake up more naturally with the Smart Wake alarm
- Run your routine with Google essentials: Find your way seamlessly during runs or rides with turn-by-turn directions from Google Maps on Fitbit Charge 6; and when you need a snack break on the go, just tap to pay with Google Wallet[1,4]
- Unlock more with Google Health Premium: With a premium membership, get personalized coaching that’s built with Gemini and adapts to your life[7]; get a 3-month trial at no cost to you[5] (Google Health Premium subscription sold separately)
Tom’s Guide fitness and wearables writer Dan Bracaglia described Fitbit Air as “by far the lightest and most comfortable.” That is his reviewer judgment, not a controlled comfort test; fit and comfort can vary from person to person.
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Tom’s Guide highlights Fitbit Air’s vibration for its Smart Alarm. Luna Band is reported to support a broader set of haptic uses, including notifications, alerts, alarms, and prompts to stand or move. If you want the band to nudge you throughout the day, Luna’s stated range of alerts may be more useful; if you mainly want a vibrating wake-up alarm, Fitbit Air covers that use.
Rank #3
- Google Fitbit Air is the unbelievably comfortable, exceptionally smart way to transform your health[1]; and Google Health brings together effortless tracking and adaptive coaching to help make the most of your everyday[2]
- Unlock more with Google Health Premium: With a premium membership, get personalized coaching that’s built with Gemini and adapts to your life[2]; get a 3-month trial at no cost to you[5] (Google Health Premium subscription sold separately)
- Comfortable fit - One Size Tracker (130-210 mm): The lightweight, micro-adjustable fit sits comfortably and quietly, so you can wear Google Fitbit Air through work, play, and sleep; advanced sensors and new algorithms power more accurate, precise health tracking, 24/7[1]
- Designed for every occasion: With no screen to distract you or disrupt your style, your tracker moves seamlessly from bracelet to workout band to sleep band, and you can change looks in seconds – just press the pebble in, click, and go
- Long battery life: Google Fitbit Air’s battery lasts up to a week, and fast charging gets you one day of battery life in just five minutes[6,7]
What to know about tracking and app availability
Tom’s Guide says Fitbit Air tracks sleep, workouts, and stress. Tech Advisor’s hands-on review describes Luna sensors for heart rate, movement, skin temperature, and SpO2, as well as compatibility with Apple Health and Google Fit. Those descriptions do not establish clinical accuracy, and Tech Advisor noted that some Luna app functions were marked “coming soon” and that SpO2 data was not visible during its test period.
Tech Advisor reviewer Mike Sawh wrote that Luna could get a user through “a week’s worth of monitoring your data 24/7,” reflecting his hands-on assessment. The review also noted scuffing on Luna’s buckle and a proprietary charger. These are useful practical considerations alongside the headline features.
Quick Recap
Best Value
- Inspire 3 is the tracker that helps you find your energy, do what you love and feel your best – all you have to do is wear it;
- Compatible with Apple iOS 16.4 or higher and Android OS 11.0 or higher
- Move more: Stay motivated with a Daily Readiness Score, Active Zone Minutes, all-day activity tracking and 24/7 heart rate, 40+ exercise modes, automatic exercise tracking, and reminders to move
- Stress less: Keep an eye on your well-being with a daily Stress Management Score, mindfulness sessions, relax breathing sessions, irregular heart rhythm notifications, SpO2, menstrual health tracking, resting heart rate, and more[1,2]
- Sleep better: Automatic sleep tracking, a daily detailed Sleep Score, smart wake vibrating alarm, and sleep mode help you improve your sleep quality[3]
Rank #4
- 【All-day Health Monitor】The fitness tracker watch will automatically track your real-time heart rate, blood pressure and blood oxygen throughout the day to help you better understand your health. Equipped with a high-performance chipset, the fitness tracker automatically analyzes your overall sleep quality (deep/light/wake time) at night and gives you a nightly sleep score in the app to help you adjust your lifestyle and make you healthier.
- 【Smart Notification Remider】 With Bluetooth connection to your phone, it can support incoming calls/text alerts/APP message notifications (WhatsApp/Facebook/Instagram etc.), you will never miss your important messages. With the fitness watch, you can also perform sedentary reminder, water reminder, alarm clock, stopwatch, remote control photo, find devices, etc. to make your life healthier and smarter.
- 【25 Sports Modes】 Fitness tracker supports 25 professional sports modes, you can choose any number of sports modes as your exclusive sports modes in the app, such as walking, running, dancing, yoga, etc. and track your steps, heart rate, distance and calories to help you stay motivated, accomplish your sports goals, record your sports data, and make your sports more scientific.
- 【Long Battery Life】The fitness watch uses magnetic fast charging to provide a better battery life experience. It takes 1-2 hours to fully charge and can be used for up to 7 days of regular use and 15 days of standby. Compatible mobile phone system: android5.0 (inclusive) and IOS9.0 (inclusive) or above.
- 【1.1" AMOLED Touch Color Screen】AMOLED HD touch color screen is designed with clear and bright display, providing you with high quality touch and visual experience. This smartwatch includes a large number of original dials and supports custom dials.
Which tracker should you buy?
- Pick Fitbit Air if a lower reported purchase price, smaller size, lighter weight, or Smart Alarm vibration matters most to you.
- Pick Luna Band if the broader reported haptic alerts and subscription-free access to its included features, including personalized AI insights, are worth the higher reported upfront price.
- Compare the app experience before deciding if a specific metric or feature is essential: some Luna functions were unavailable during Tech Advisor’s review period, and the listed sensors should not be treated as proof of clinical-grade measurement.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
