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FITTR HART Smart Ring vs Oura Ring 5
Side-by-side comparison of manufacturer specifications: weight, size, battery life, sensors, app compatibility and subscription fees.
By Gil Sapir, Editor · Data compiled from manufacturer specifications and public sources (methodology).
⚡⚡ Quick-Decision Verdict: FITTR HART Smart Ring vs Oura Ring 5
⚡ Quick-Decision Verdict: FITTR HART Smart Ring vs Oura Ring 5
Spec-based comparison of FITTR HART Smart Ring and Oura Ring 5 using manufacturer data: subscription cost, battery life, weight, sizing and sensors. WearableTier does not test devices hands-on.
📋 Key Takeaways:
- ✓FITTR HART Smart Ring features $0/mo zero-subscription model with 7-day battery life.
- ✓Oura Ring 5 provides $5.99/mo subscription with 7-day battery life.
- ✓Always test sizing kits for 24 hours prior to final device selection to guarantee reliable biometric signal tracking.
The world's most accurate fitness ring with high comfort and style.
World’s smallest smart ring with 50+ health metrics at your fingertips
Smart Ring Sensors & Biometric Architecture Guide
An overview of optical PPG sensors, skin temperature thermistors, and signal basics.
🏆 Category Matchup Trophies
Lowest list price plus 12 months of app subscription fees (MSRP; retail prices vary).
Based on each manufacturer's published app compatibility.
FITTR HART Smart Ring
Check Price on Amazon⚡ No monthly subscription fee listed
Oura Ring 5
Interactive Biometric Load & Battery Simulator
Manufacturer battery specifications test rings under ambient laboratory conditions. Adjust your daily wearable sensor profile below to estimate real-world endurance and charge cycle frequency.
FITTR HART Smart Ring
Rated Spec: 7 Days MaxOura Ring 5
Rated Spec: 7 Days MaxSensor & Hardware Spec Comparison
Published manufacturer specifications for optical sensors, water resistance, thickness and fees
| Hardware Sensor Metric | FITTR HART Smart Ring | Oura Ring 5 |
|---|---|---|
| Optical PPG LED Array | Red, Green, Infrared | Red, Infrared, Green |
| Skin Temperature Sensor | Listed | Listed |
| Sleep Metrics Listed | Sleep Duration, Sleep Stages, HRV | Total Sleep, Heart Rate Variability (HRV), Nighttime Movement, Sleep Regularity |
| Water Resistance Depth | 50m | 100m/328 ft, IP68 rated for water and dust |
| Chassis Thickness | 2mm | 2.28mm |
| Monthly Software Fee | No Monthly Fees | $5.99/mo |
Battery life estimates apply an illustrative usage multiplier to each ring's manufacturer-rated battery life. Actual endurance varies with settings, fit, and daily activity.
View Full Technical Specs +
Isolated spec differences and direct hardware deltas
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View Full Technical Specs +
Isolated spec differences and direct hardware deltas
| Feature Delta | FITTR HART Smart Ring | Oura Ring 5 |
|---|---|---|
| MSRP | $250 | $399 |
| Monthly Subscription | Zero Subscription Fees | $5.99/mo |
| Thickness | 2mm | 2.28mm |
| Width | 8mm | 6.09mm |
| Water Resistance | 50m | 100m/328 ft, IP68 rated for water and dust |
| Charging Case Included | ✓ Yes | ✕ No |
| Cycle Prediction Support | ✕ No | ✓ Yes |
Shared Standards (6 Identical Specifications)↓
How the FITTR HART Smart Ring and Oura Ring 5 Compare
The head-to-head matchup between the FITTR HART Smart Ring and the Oura Ring 5 represents two distinct engineering philosophies. The FITTR HART Smart Ring features a Titanium (2mm thick, 3g), while the Oura Ring 5 is constructed from High-performance Titanium (2.28mm thick, 3g). Both offer robust environmental sealing (50m vs 100m/328 ft, IP68 rated for water and dust water resistance).
On the software front, the FITTR HART Smart Ring operates under a zero-subscription model ($0/mo forever), whereas the Oura Ring 5 requires a recurring $5.99/mo membership to access historical sleep profiles, readiness trends, and advanced AI algorithms.
Per manufacturer battery specifications, the FITTR HART Smart Ring is rated for up to 7 days (with a 60-minute recharge via USB Cable), while the Oura Ring 5 is rated for up to 7 days on a single charge (requiring 80 minutes via Standard charger via USB-C).
Structured Technical Comparison Matrix
| Spec | FITTR HART Smart Ring | Oura Ring 5 |
|---|---|---|
| Battery Life | Up to 7 Days | Up to 7 Days |
| MSRP & Price Tier | $250 ($$ Tier) | $399 ($$$ Tier) |
| Weight | 3g | 3g |
| Outer Shell Material | Titanium | High-performance Titanium |
| Charging Method | USB Cable | Standard charger via USB-C |
Interactive Ecosystem Sync Flowchart
Select your phone OS, fitness watch, and apps. Visualize exactly how data flows from your smart ring to your ecosystem, and highlight broken links.
Sync Flow Map
Virtual Sizing Assistant
Convert your finger circumference to a standard US ring size. Smart ring brands may size differently from jewelers, so confirm with the manufacturer's sizing guide or sizing kit before buying.
Your Standard US Ring Size
Smart ring sizes vary by brand and model. Use this as a starting point and confirm your size with the manufacturer's sizing guide or sizing kit before ordering.
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Frequently Asked Questions
Is FITTR HART Smart Ring better than Oura Ring 5?
The choice between FITTR HART Smart Ring and Oura Ring 5 depends on your priorities. FITTR HART Smart Ring weighs 3g and costs $250 MSRP with a monthly subscription of $0.00. Oura Ring 5 weighs 3g and costs $399 MSRP with a monthly subscription of $5.99.
How does the battery life compare between FITTR HART Smart Ring and Oura Ring 5?
FITTR HART Smart Ring offers up to 7 days of battery life, whereas the Oura Ring 5 provides up to 7 days of battery endurance.