Oura Ring Generation 3

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Classification

Oura Ring Generation 3
Classification
Grade A
Calculator version 1
Classification date 2025-10-13
Information
Name Oura Ring Gen3
Brand by Parent Oura by Oura Health Oy
Generation 3
Model(s) Heritage, Horizon
Release date 2021-10-26
Type/Category Smart Ring
Website [1]
Status In sale
More
Dimensions Width: 7.9mm, Thickness: 2.55mm (size varies)
Mass 4g - 6g (depending on size)
Operating system Proprietary firmware
Companion App Oura App (iOS and Android)
CPU Not publicly disclosed
GPU N/A
Memory Not publicly disclosed
Storage Local buffer for up to 6 weeks of data
Battery Up to 7 days of battery life (15-22mAh LiPo)
Power Custom charging puck with USB-C cable
Charging Proprietary wireless charging
Display N/A (No display)
Camera N/A
Sound N/A
Connectivity Bluetooth Low Energy (BLE)
Device
Criterion Value Proof(s) Comment
Known hardware tampering None [2] Sealed unibody design, not user-serviceable. Attempting to open it would cause destructive damage.
Known vulnerabilities Rare [3] No widespread, publicly documented vulnerabilities. The device receives regular over-the-air (OTA) firmware updates via the companion app.
Prior attacks None [4] No publicly known, targeted attacks against the device or its firmware.
Updatability Very common [5] Firmware is updated automatically and frequently over-the-air (OTA) through the connected Oura App.
Category score 2
System
Criterion Value Proof(s) Comment
Authentication with other systems Full [6] Uses standard secure Bluetooth Low Energy (BLE) pairing protocols to authenticate with the smartphone app.
Communications Encrypted with up-to-date encryption [7] All data transmitted between the ring and the phone is encrypted over the Bluetooth connection.
Storage Encrypted with up-to-date encryption [8] Data is protected by the phone's OS-level encryption. Cloud data is encrypted at rest.
Category score 1
User Authentication
Criterion Value Proof(s) Comment
Account management Full [9] Full user account management is provided through the Oura App and cloud service.
Authentication Secure [10] Authentication is handled by the Oura cloud account, which supports strong passwords and SSO with Google/Apple (which can be MFA-protected).
Brute-force protection Exist [11] Standard cloud service login mechanisms include protection against brute-force attacks.
Event logging Access event logged [12] Account login activities are logged on the server-side for security and auditing purposes.
Passwords Require change after setup with complexity requirements [13] Oura account creation enforces standard password complexity rules.
Category score 1
Grade A