Last updated: April 14, 2026
These Terms & Conditions ("Terms") form a legally binding agreement between you and MJ Collective, operated by M.J. Nauta ("Defog," "we," "us," or "our") governing your access to and use of the Defog mobile application, any Defog websites or landing pages that link to these Terms, and related features, content, insights, recommendations, experiments, and services (collectively, the "Services").
By creating an account, downloading, accessing, or using the Services, you agree to these Terms and to our Privacy Policy. If you do not agree, do not use the Services.
You must be at least 16 years old to use the Services. If local law requires a higher minimum age, you must meet that higher age. The Services are not intended for children below the applicable minimum age.
Defog is a wellness, self-tracking, pattern-spotting, and informational service designed to help users log health- and lifestyle-related information and receive generated insights, recommendations, and self-experiment ideas.
Defog is not a doctor, medical clinic, hospital, emergency service, licensed medical professional, medical advice line, or medical device.
Defog is not intended to diagnose, treat, cure, or prevent any disease or medical condition, and is not intended to replace professional medical advice, diagnosis, or treatment.
If you think you may have a medical emergency, contact emergency services immediately and seek professional care.
Defog may use rules-based systems, statistical models, machine learning systems, and large language model systems to generate or support certain outputs, including pattern summaries, recommendations, experiments, and explanatory text.
AI-generated or algorithmically generated outputs may be inaccurate, incomplete, misleading, or inappropriate for your circumstances. Defog’s outputs are informational only and should be independently evaluated by you.
You are solely responsible for deciding whether and how to act on any output.
Any action you take based on the Services is taken at your own risk. This includes changes relating to food, meal timing, supplements, medications, caffeine, exercise, sleep, hydration, stress management, routines, or other health or lifestyle behaviors.
Individual responses vary materially. A suggestion that appears benign for one user may be ineffective or harmful for another. You should consult a qualified healthcare professional before acting on outputs if you have symptoms, are taking prescription medications, are pregnant, trying to conceive, breastfeeding, under medical supervision, or have a diagnosed or suspected medical condition.
You may need to create an account to use some or all features. You agree to provide accurate, current, and complete information and to keep it updated. You are responsible for maintaining the confidentiality of your credentials and for all activity under your account.
If you suspect unauthorized access or misuse of your account, contact us promptly at support@defogapp.com.
Defog may offer free and paid tiers, including trial periods and auto-renewing subscriptions. Where subscriptions are sold through Apple’s App Store, billing, renewals, cancellations, refunds, and payment processing are handled by Apple under Apple’s terms and policies.
Unless applicable law requires otherwise, refunds for App Store purchases must be requested through Apple. Free trials automatically convert into paid subscriptions unless cancelled before the trial ends. We may change subscription pricing, features, or packaging in the future, subject to applicable law and platform rules.
Subject to your compliance with these Terms, we grant you a limited, revocable, personal, non-exclusive, non-transferable, non-sublicensable license to use the Services for your personal, non-commercial use.
You agree not to:
As between you and Defog, you retain your rights in the personal data and content you submit, including logs, notes, meal data, symptoms, onboarding answers, and other inputs ("User Data").
You grant us a limited, non-exclusive, worldwide license to host, store, reproduce, process, analyze, transmit, and use your User Data solely as necessary to operate, maintain, secure, improve, and provide the Services in accordance with our Privacy Policy.
We may modify, suspend, or discontinue all or part of the Services at any time. We may add, change, or remove features, including premium features, AI features, experiments, reports, and integrations. Some features may be marked beta, preview, experimental, or early access and may be more error-prone or withdrawn at any time.
The Services may interoperate with third-party platforms, operating systems, app stores, authentication providers, cloud providers, email providers, AI providers, or device features. Your use of third-party services may also be subject to those third parties’ terms and privacy policies.
If Defog integrates with Apple Health or HealthKit in the future, such integration will only occur with your explicit permission. If enabled, data obtained through Apple Health or HealthKit will not be used for advertising, marketing, or data broker purposes.
We and our licensors own all right, title, and interest in and to the Services, including software, interfaces, design, text, graphics, trademarks, logos, compilations, and generated service content, excluding your User Data.
If you submit ideas, suggestions, feedback, bug reports, or enhancement requests, you grant us a worldwide, perpetual, irrevocable, sublicensable, transferable, royalty-free license to use them without restriction or compensation, unless applicable law requires otherwise.
To the fullest extent permitted by law, the Services are provided “as is” and “as available,” without warranties of any kind, whether express, implied, statutory, or otherwise.
We do not warrant that the Services will be uninterrupted, secure, error-free, or that any output, recommendation, experiment, or insight will be accurate, reliable, complete, safe, or suitable for you.
To the fullest extent permitted by law, we will not be liable for any indirect, incidental, consequential, special, exemplary, or punitive damages, or any loss of profits, revenue, data, goodwill, or business opportunity.
To the fullest extent permitted by law, our total aggregate liability for all claims relating to the Services will not exceed the greater of:
Nothing in these Terms excludes or limits liability that cannot be excluded or limited under applicable law.
You may stop using the Services and delete your account at any time. We may suspend, restrict, or terminate access to the Services if we believe you violated these Terms, created risk, engaged in fraud or abuse, or if required by law.
If you are a consumer residing in a jurisdiction with mandatory consumer protections, nothing in these Terms limits those rights.
These Terms are governed by the laws of the Netherlands, excluding conflict-of-laws rules, unless mandatory consumer law in your jurisdiction requires otherwise.
Before bringing a formal claim, you agree to contact us at support@defogapp.com and attempt to resolve the dispute informally for at least 30 days.
If informal resolution fails, disputes will be brought in the courts of the Netherlands, unless mandatory law gives you the right to bring claims elsewhere.
We may update these Terms from time to time. If we make material changes, we may provide notice through the Services, by email, or by other reasonable means. Your continued use of the Services after the effective date of updated Terms means you accept the updated Terms, except where applicable law requires a different process.
Questions, complaints, and legal notices may be sent to support@defogapp.com.
Apple is not a party to these Terms and is not responsible for the Services. To the extent required by Apple’s terms for apps distributed through the App Store, you and we acknowledge that this agreement is between you and us, not Apple; Apple has no obligation to furnish maintenance or support services for the app; and Apple and Apple’s subsidiaries are third-party beneficiaries of these Terms as they relate to your use of the app.