Alloop Trio is a screenless health tracker built around one 2.4g sensor, the Cube, that clips into a wristband by day and a ring at night. Alloop unveiled it in New York on 23 October ahead of a Kickstarter campaign, with a starting price of $299 and no subscription.
- The Cube uses PPG optical sensing to track heart rate variability, resting heart rate, blood oxygen, breathing rate and temperature, according to Alloop’s Trio page.
- There are three ways to wear it: in the Ring, in the Band, or in the Halo Band, which adds a light ring, vibration reminders and extra battery.
- Alloop rates the Cube at seven days per charge, and Halo charges the Cube while it is worn so tracking continues during recharging.
- The Cube is rated 5 ATM for swimming as a ring or band, while Halo is rated IP68 for rain and workouts.
- A double tap on Halo records a voice note, such as a meal, a coffee or how a session felt, and the app’s AI Health Agent adds it to the sensor data.
- The app produces sleep, recovery and Bio Age scores, and the launch announcement says it also reads data from Apple Health, Google Health and Health Connect.
Opinion
We’ve seen modular wearables before, and we will see them again; this is a minor example of modularity.
The future of wearables is modular sensors, batteries, and other components. Tired of your AMOLED display? Simply buy a MIP module to replace it. That kind of thing, with an even more obvious example being the battery.
Once modules exist at scale, 3D home printing will let you design and produce the case as well.
What it means for athletes
Trio lets an athlete keep one continuous HRV and sleep record while switching between a ring for the night and a band for lifting, climbing or racket sports, where a ring gets in the way. Rings such as RingConn and the Amazfit Helio Ring are worn only on the finger.
Trio is a crowdfunded product that has not shipped, and Alloop has published no accuracy data for the Cube. Overnight HRV from a finger or wrist sensor is only as useful as its consistency, which is covered in the Forerunner 955 HRV study.
Quick answers
How much does Alloop Trio cost?
Alloop lists Trio at a starting price of $299 for its Kickstarter campaign, and the app is free to use with optional AI add-ons.
Can Alloop Trio be worn for swimming?
Alloop rates the Cube sensor at 5 ATM, so it can be worn swimming as a ring or band. The Halo module is rated IP68, which covers rain and splashes.
For tested alternatives, see the best recovery tracker guide and the best fitness tracker guide.
Last Updated on 24 October 2026 by tfk the5krunner
Small things I always use
- Garmin 90-degree charging adapter: Charges your Garmin from any USB-C cable. Essential when travelling. I use one.
- Body Glide: The blue anti-chafe stick swimmers and runners carry. I use it.
- Speedo earplugs: Fewer ear infections and no cold-water dizziness. I use them.
- Dryrobe Advance: My winter changing robe for open-water swims. I use one. A cheaper option is the AONYIYI changing robe.
- Maurten: Race fuel that stays easy on the stomach. I use them.
- Beet It Sport nitrate shots: Beetroot shots I take in the days before a race. I use them.
- Garmin charging puck: The quickest way to top up before a session. I use one.
- Injinji: Toe socks that stop rubbing, so you run more. I use them.
- Ultimate toe protectors: Stop black toenails on long runs. They work. I use them.
- Compressport R2 v2 calf sleeves: My calf sleeves of choice. I use them.
- Cellucor C4: My pre-workout before hard sessions.
- TPU tubes: Schwalbe Aerothan, Tubolito and Pirelli SmarTube. Light, tiny spares. I use all three.
- G8 insoles: Adjustable insoles that are good. I use them.
- Cycplus Cube: A 97g electric pump that gets a road tyre rideable in two minutes. I carry one. 5% off with code THE5KRUNNER.
Watches and sensors
- Polar H10: My daily driver for waking HRV.
- Polar Verity Sense: My backup arm-worn HR sensor.
- Nomad bedside charger: Charges my iPhone and Apple Watch overnight. I use it, and many of their bands.
- Train.Red: The best muscle oxygen sensor I’ve used.
- Tymewear: Accurate heart rate and reliable ventilatory zones. I use it to pace endurance rides over an hour.
- Garmin Forerunner 970: A pro-grade triathlon watch. I use this.
- Apple Watch Ultra 4: My daily smartwatch. No phone needed on rides.
- Garmin Fenix 9 Pro: I’ve just bought one.
On the bike
- Continental GP5000 for everyday riding, and Aero 111 on the front for special occasions.
- Helmets: Specialized S-Works Evade 3 for road riding, and Rudy Project Wing for TT-style races. I use both.
- Ravemen FR300: A front light that mounts under your Garmin or Wahoo. I use one.
- Wahoo TRACKR Radar: I use it on one bike and Varia on the other. They perform the same.
- Garmin Varia RTL515: Radar that warns you of cars from behind. I use this model.
- Wahoo ELEMNT Roam 3: The bike computer that’s easy to use. I use mine on most rides.
- Favero Assioma Pro RS2: Accurate power pedals that swap easily between bikes. I use this model.
Home and indoor training
- NPE Runn: Makes my basic treadmill smart, sending more accurate speed and distance to my watch and Zwift. I use it.
- Google Wifi: Keeps Zwift connected in my pain cave. I use it.
- Apple TV 4K: Zwift on the big screen. I use two.
- Google Nest Doorbell (wired, 2nd gen): My video doorbell, running in both Google Home and Apple Home. I use it.
Health, recovery and sleep
- FreeStyle Libre 3 Plus: Shows how my blood sugar responds to diet.
- hDrop: Measures my sweat loss in summer and indoors.
- Fourth Frontier Zone: Checks my heart under load in hard sessions.
- Oura Ring 5: My partner’s recovery tracker of choice.
- Eight Sleep: A cooling mattress cover my partner and I use nightly.
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tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. See the gear tfk uses. ID
