"Cronometer presents critical privacy risks due to extensive collection of sensitive health data, widespread sharing with third-party AI providers (including OpenAI) and unspecified business partners, and aggressive cross-site behavioral tracking without Do Not Track compliance. The service collects 50+ data categories including biometric information, keystroke data, and health records stored on U.S. servers subject to law enforcement access. De-identified data is sold to third parties indefinitely, and users cannot fully opt-out of sharing without losing service functionality."
cronometer Privacy Concerns & Scorecard
Extensive collection of sensitive health data including nutrition, diet, exercise, health conditions, health targets, biometric data, and health information from third-party health platforms (Apple HealthKit, Health Connect). Additionally collects behavioral characteristics, keystroke data, and food photos used for AI model training.
Health data shared with OpenAI (third-party AI company) for AI assistant functionality with limited explicit consent mechanisms. Food photos and user corrections used to train AI models with unspecified third-party providers without granular consent.
De-identified and aggregated information retained indefinitely without user control or deletion mechanism. Data may be retained longer for legal compliance, fraud prevention, and dispute resolution with vague parameters.
Policy uses ambiguous language regarding data sharing and collection purposes. Terms like 'business partners' and 'marketing relationships' are not clearly defined. Food photo AI training lacks explicit separate consent language.
Network advertisers and sponsors use cookies and other technologies to collect click stream information, browser type, time/date data for behavioral advertising and measuring ad effectiveness. Free users subject to targeted advertising with limited opt-out mechanisms.
Certain Site features may not function if users disable cookies, limiting meaningful opt-out options for tracking. Even opted-out users may be contacted by Cronometer at company's discretion.
No recommended actions at this time.
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Data Collection & Tracking
Personal Information Collected
Account creation, verification, communication, legal compliance, fraud prevention
Service core functionality, health tracking, AI training with third parties (including OpenAI)
Service functionality, AI model training, behavioral analytics, fitness tracking
Payment processing, subscription management, financial compliance
Service functionality, AI/ML model training, profile content
Service operations, analytics, security, device identification, cross-device tracking
Service improvement, analytics, behavioral advertising, personalization
Service functionality, sharing features, integration with health platforms
Cross-Platform Tracking
Cronometer tracks users across multiple platforms and devices through first-party and third-party persistent cookies that monitor browsing habits across websites and apps. The service integrates with Apple HealthKit and Health Connect, syncing data across health ecosystem platforms. Device fingerprinting via device ID, operating system, and browser type enables cross-device tracking. Third-party analytics tools and network advertisers extend tracking beyond Cronometer's own services.
Tracking Methods:
First-party Persistent Cookies
Cronometer uses first-party cookies to monitor traffic, record viewing information, and track user behavior within the Cronometer platform. These persist across sessions.
Third-party Persistent Cookies
Network advertisers, sponsors, and analytics companies place third-party cookies to track users across multiple websites and apps, collect click stream data, and enable behavioral advertising and retargeting.
Device Fingerprinting
Collection and combination of device type, operating system, browser type, device ID, and other device identifiers to create a unique fingerprint enabling cross-device tracking and user identification.
Third-party App & Health Platform Integration
Integration with Apple HealthKit, Health Connect, and other third-party health applications enables automatic data synchronization and cross-platform health data sharing with external ecosystems.
Analytics Tracking
Third-party analytics tools track user behavior, page interactions, feature usage, and performance metrics; data shared with analytics providers and potentially used for behavioral analysis and advertising.
AI & Data Training
cronometer uses your content to train AI
Below is what's used and how (if at all) you can object.
What Content Is Used
Food Photos
Food photographs submitted by users are used to train AI/ML models with third-party providers to improve nutrition analysis and food recognition capabilities.
User Corrections and Comments
User-submitted corrections and comments on food items and nutrition data are used to train AI models with third-party providers to improve data accuracy and model performance.
Limited Health Information
Limited health information from Pro users is shared with OpenAI to power the AI assistant feature for natural language health queries and analysis (with explicit consent).
How to Object
No opt-out available
This service does not currently provide a public way to opt out of AI training.
Why We Analyzed cronometer
TrueTerms automatically audits privacy policies and data practices using advanced machine learning to keep you informed and protected. This scorecard is based on the latest available public terms of service and privacy policies as of 2026.