Fitbit Sense 3

Fitbit Sense 3
Security Grade A- Calculator v1	Fitbit Sense 3 Brand: Fitbit (Parent: Google) Category: Smartwatch • Model / Gen: 3rd Generation Sense 3 Release Date: 2025-08-20 • Status: Classification Date: 2025-09-24 • Official Website

Security Evaluation

1. Device Security

Criterion	Value	Proof	Comment
Known hardware tampering	Rare	—	Minor tampering risk
Known vulnerabilities	Rare	—	Rare security issues
Prior attacks	None	—	No prior attacks
Updatability	Very common	—	Frequent updates
Category Score	Score: 2 / 3

2. System Security

Criterion	Value	Proof	Comment
Authentication with other systems	Full	—	Supports Google login
Communications	Encrypted with obselete encryption	—	Uses modern encryption
Storage	Encrypted with up-to-date encryption	—	Secure data storage
Category Score	Score: 2 / 3

3. User Authentication

Criterion	Value	Proof	Comment
Account management	Full	—	Secure and easy management
Authentication	Secure	—	Secure account access
Brute-force protection	Exist	—	Effective brute-force prevention
Event logging	Access event logged	—	Detailed event logging
Passwords	Require change after setup with complexity requirements	—	Strong password policy
Category Score	Score: 1 / 3

Technical Specifications

Property	Details
Operating System & App	Fitbit OS 5 (Companion App: Fitbit App)
Hardware (CPU / GPU)	CPU: ARM Cortex M4 • GPU: Adreno 405
Memory & Storage	Memory: 1GB RAM • Storage: 16GB
Power, Battery & Charging	Battery: 6-day battery life • Power: 4W • Charging: Wireless charging
Display & Camera	Display: 1.58 inches, 336 x 336 pixels • Camera:
Sound & Connectivity	Sound: Dual speakers • Connectivity: Bluetooth 5.0, Wi-Fi
Physical (Dimensions & Mass)	Dimensions: 40mm • Mass: 33g