Free Shark Smart Ring — Sleep & Health Tracker
Gold smart ring with HR, SpO2, sleep, steps, IP68 waterproof, 5-day battery, no subscription — iOS & Android compatible.
Introduction
Wearable tech has evolved beyond bulky wrist devices. The Free Shark Smart Ring condenses advanced health sensors, activity tracking and everyday convenience into a discreet, ultra-thin band you can forget you’re wearing. For anyone juggling workouts, work deadlines, travel and sleep optimization, this smart ring promises to make continuous health insight subtle, accurate and frictionless — without tying you to a monthly subscription.
Modern life demands data that’s easy to act on: reliable heart-rate and SpO2 readings during exercise, intelligent sleep staging to improve recovery, and always-on step and calorie tracking that fits every situation from meetings to swims. The Free Shark ring tackles these needs with a blend of precise sensing, long battery life, true water resistance and an app-first approach that syncs with iOS and Android — designed to help users make measurable improvements to health, productivity and daily routines.
Overview
The Free Shark Smart Ring is a compact, round health tracker running AsteroidOS and using Bluetooth to connect to your phone. The device packs a 1-inch display and continuous monitoring sensors for heart rate, blood oxygen and movement, while automatically classifying activity types like running, cycling, yoga and swimming. Its ultra-thin, lightweight construction and gold finish make it a wearable both functional and fashionable.
Comfort was prioritized in the redesign: the ring is slimmer and lighter than previous iterations and ships with a smart charging case that extends overall usage time. With IP68-level waterproofing rated for depths up to 80 meters, the ring is suited to intense workouts and swims. Set up is straightforward via the Free Shark app on iOS or Android, and all features are available with no subscription fees — data, insights and professional-style reports are unlocked for life.
Features
Advanced Optical Heart-Rate & SpO2 Sensor: The ring includes continuous optical sensors that measure heart rate and blood oxygen (SpO2) throughout the day and night. Advantage: Continuous sampling provides trend insights instead of single-point readings, revealing recovery patterns, exertion zones, and respiratory health signs. Benefit: You’ll know when to push a workout, when to rest, and when a dip in blood oxygen or a persistent elevation in heart rate needs attention — all from a tiny, unobtrusive device.
Intelligent Sleep Monitoring & Coaching (No Subscription): Automatic sleep staging reports include durations for deep sleep, light sleep and wake periods with professional-style summaries in the app. Advantage: The app presents detailed sleep metrics and targeted, actionable suggestions without requiring recurring fees. Benefit: Better sleep becomes achievable through clear guidance — change your bedtime habits, optimize naps and track the impact of lifestyle adjustments without unexpected costs.
Comprehensive Activity Modes & Auto-Detection: Multiple sport modes (running, walking, hiking, cycling, yoga, dancing, skipping rope) and auto-activity detection capture route, steps, calories, distance and speed (GPS via smartphone). Advantage: Automatic recognition and robust activity logging reduce manual entry and deliver accurate workout details. Benefit: Whether training for a 5K or squeezing in a HIIT session between meetings, the ring removes friction so fitness goals are easier to pursue and measure.
Ultra-Thin, Durable & IP68 Waterproof Design: A lightweight, ultra-thin form factor with an 80-meter waterproof rating and skin-friendly materials. Advantage: It’s comfortable for 24/7 wear, safe for swimming, showers and sweat-heavy sessions, and resistant to daily wear. Benefit: Continuous tracking never gets in the way — wear it to the gym, the office, or the pool and keep your data complete and consistent.
Long Battery Life with Smart Charging Case: Up to 5 days of battery life on a single charge and more than 30 days of usage when paired with the included smart charging case. Advantage: Fewer interruptions for charging and a portable case that extends life for travel or multi-day trips. Benefit: Spend more time using insights and less time tethered to chargers — the ring adapts to busy schedules and travel demands with confidence.
Benefits
Improve Recovery & Performance
Accurate heart-rate trends and sleep-stage insights help athletes and fitness enthusiasts optimize training load, avoid overtraining and improve performance by aligning workouts with recovery status.
Better Sleep, Better Days
Detailed sleep reports and coaching tips make it practical to fix small habits (bedtime, caffeine timing, stress reduction) that compound into significantly better daytime focus and energy.
Seamless 24/7 Health Awareness
Continuous SpO2 and heart-rate monitoring with automatic activity detection gives a reliable picture of daily health without manual logging — ideal for busy users who want meaningful alerts and long-term trends.
No Ongoing Costs, Full Feature Access
All app functionality and professional-style insights are included without subscription fees, saving money and simplifying long-term wellness tracking.
Travel-Ready Convenience
Long battery life and a compact charging case mean you can travel for days without finding a power source, while the waterproof build keeps tracking consistent in all environments.
Usages
Perfect for fitness tracking and goal setting
Use auto-detection during runs, rides or gym sessions to capture heart-rate zones and calories burned. Sync workouts to the Free Shark app to review improvements week-to-week and refine training plans.
Ideal for busy professionals managing notifications and recovery
Wear the ring during long workdays to monitor stress via elevated heart rate and to validate restorative sleep after travel, helping prioritize rest over extra meetings when recovery is low.
Excellent for monitoring wellness during travel
Rely on multi-week battery performance with the charging case and IP68 waterproofing for pool laps and rainy-day exploration, while the app tracks sleep disruptions across time zones.
Pros & Cons
Pros
- Compact, discreet design that’s comfortable for 24/7 wear
- Comprehensive sensors: heart rate, SpO2, steps, sleep staging
- IP68 waterproof rating up to 80 meters
- Strong battery life with smart charging case (5 days standalone, 30+ days with case)
- No subscription fees — full app access included
- Broad activity detection and smartphone GPS integration
- Works with both iOS and Android
Cons
- Ring sizing must be measured carefully — returns/exchanges can be inconvenient
- Item weight and listed battery/battery type details are inconsistent with typical ring form factors (verify included accessories at purchase)
- Smaller display limits on-device interaction — most data viewed through the app
- AsteroidOS may offer fewer third-party integrations than mainstream smartwatch platforms
FAQs
Is the ring really waterproof to 80 meters and suitable for swimming?
Yes. The Free Shark Smart Ring is rated to IP68 and specified for depths up to 80 meters, making it suitable for swimming, showers and heavy sweat, but avoid exposing it to high-speed water sports where forceful impacts could compromise seals.
How long does the battery last and what does the charging case do?
A full charge delivers up to 5 days of continuous use. The included smart charging case provides portable recharges that can extend total usage beyond 30 days between wall charges, ideal for travel.
Will it work with my iPhone or Android phone?
Yes. The ring connects via Bluetooth and is compatible with iOS and Android devices through the Free Shark Smart Health Monitoring App. GPS tracking uses your smartphone’s GPS for route data when needed.
How accurate are the heart-rate and SpO2 measurements?
The ring uses continuous optical sensors and provides reliable trends and event detection for daily health and fitness. While accurate for most wellness and training needs, it should not replace medical-grade devices for clinical diagnosis.
Do I need to pay a subscription to access advanced features?
No. All app functions and professional-style reports are included for life without subscription fees, giving full access to sleep coaching, activity analysis and health trends.
Product Specifications
| Brand | Free Shark |
| Model | Smart Ring |
| Color | Gold |
| Available Size | 7 (measure finger circumference before purchase) |
| Operating System | AsteroidOS |
| Connectivity | Bluetooth (smartphone pairing) |
| Wireless Standard | Bluetooth |
| Screen Size | 1 Inch |
| Sensors | Optical heart-rate, SpO2, accelerometer (steps), sleep monitoring |
| GPS | GPS via smartphone |
| Waterproof Rating | IP68 (rated to 80 meters) |
| Battery Life | Up to 5 days per charge; 30+ days with charging case |
| Battery Type | Lithium Ion (internal); package lists 1 A battery included for accessory |
| Charging | Smart charging case included |
| Compatibility | iOS and Android via Free Shark app |
| Materials | Ultra-thin, skin-friendly materials (gold finish) |
| Weight | 2.89 ounces (item weight as listed) |
| Package Dimensions | 2.99 x 2.99 x 1.85 inches |
| ASIN | B0FRD7BVNZ |
| Date First Available | September 17, 2025 |
| Manufacturer | Free Shark |
| Warranty | Refer to manufacturer for warranty details |
Ratings
| Technology & Features | 4.8 |
| Comfort & Wearability | 4.7 |
| Battery Performance | 4.2 |
| Durability & Waterproofing | 4.4 |
| Sensor Accuracy & Health Insights | 4.6 |
| Ecosystem Integration | 4.3 |
| Value for Money | 4.1 |
| Ease of Use | 4.5 |
Recommendation
Best for fitness enthusiasts and health-conscious users who want continuous heart-rate and SpO2 monitoring in a discreet form factor without paying subscription fees. The ring’s automatic activity detection and rich sleep analytics make it a great companion for athletes and everyday users alike.
Also ideal for travelers and professionals who value long battery life, water resistance and a minimal, stylish wearable that provides meaningful health insights with low maintenance.
Conclusion
The Free Shark Smart Ring delivers a compelling mix of advanced sensors, comfortable design and practical features that fit neatly into modern life. It blends continuous heart-rate and SpO2 monitoring, rich sleep analysis and automatic activity detection into a slim, waterproof ring that stays out of the way while collecting the data you actually use to improve health and performance.
With no subscription fees, a smart charging case for extended uptime, and broad compatibility with iOS and Android, this ring is a smart investment for anyone who wants persistent, actionable health insight without the bulk of a wrist device. Measure your size carefully, pair it with the app, and you’ll have a discreet wellness coach on your finger — ideal for tech-forward users who prioritize comfort, accuracy and long-term value.
