Effective date: 27 May 2026
Last updated: 7 September 2026
Montrose Labs ("we", "us" or "our") operates the GRIND fitness and activity-tracking application ("GRIND", the "App" or the "Service").
This Privacy Policy explains what personal information GRIND may collect, how that information is used, how it may be shared, how long it is retained, and the choices and rights available to users.
By using GRIND, you acknowledge the practices described in this Privacy Policy.
Depending on the GRIND features you use and the permissions you provide, we may collect the following information:
When you use outdoor activity tracking or other location-based features, GRIND may collect GPS location information required to:
Location information is only accessed where the appropriate device permissions have been granted.
If you contact Montrose Labs for support, we may process information you provide in your message, including your email address and details relating to the issue you are experiencing.
Information you submit to GRIND's AI-powered features may be processed to provide coaching insights, workout suggestions and related responses.
Users should avoid entering unnecessary sensitive medical or personal information into AI-powered features.
GRIND processes fitness and activity information that users provide or generate while using the App.
This may include:
GRIND is designed as a fitness and activity-tracking application and is not intended to provide medical diagnosis or treatment.
GRIND does not currently access heart-rate data from Apple Health, Health Connect, wearable devices or other connected health services unless such functionality is explicitly made available within the App and the user grants the required permissions.
If additional health integrations are introduced in the future, GRIND will request the appropriate permissions before accessing the relevant information and this Privacy Policy will be updated where necessary.
We may use information collected through GRIND to:
We do not sell users' personal information.
GRIND uses location information when you activate features requiring GPS tracking.
This may include walking, running, cycling or other outdoor activities.
Location information may be used to:
Where you have granted the required device permissions, GPS tracking may continue during an active activity session while GRIND is operating in the background or while your device screen is locked.
This helps GRIND maintain accurate activity tracking when an active workout is underway.
GRIND does not intentionally continuously track your location when no location-based activity session or location-dependent feature is active.
Location information saved as part of a completed activity may remain associated with that activity until you delete the activity or your GRIND account.
You may control or disable location access through your device settings at any time. Disabling location access may prevent some GPS and route-tracking features from functioning correctly.
GRIND uses AI-powered services to provide features such as:
Workout and activity information may be processed by third-party AI providers where necessary to generate these responses.
We aim to minimise the amount of directly identifiable personal information shared with AI providers.
AI-generated information is provided for general informational and fitness purposes only.
GRIND is not a medical application, and AI-generated content should not be treated as medical advice, diagnosis or treatment.
Users should consult an appropriately qualified healthcare professional where medical advice is required.
GRIND may offer optional paid subscriptions, including GRIND Pro.
Subscription purchases made through the iOS version of GRIND are processed by Apple through the App Store.
Subscription purchases made through the Android version of GRIND are processed through Google Play.
Montrose Labs does not directly collect or store users' full payment-card or banking details for App Store or Google Play subscriptions.
We may receive and process limited subscription-related information including:
GRIND uses RevenueCat to help manage subscriptions, verify purchases and determine whether premium features should be available to a user.
RevenueCat may process limited purchase, transaction, device and subscription information required to provide subscription-management services.
Payment processing, refunds, billing and payment-account information are handled by Apple or Google depending on the platform through which the subscription was purchased.
GRIND may use third-party service providers to operate, maintain and improve the App.
These may include:
Apple may process information relating to App Store purchases, subscriptions, authentication and device services where applicable.
GRIND may use services provided by Google, including:
Google's own privacy policies and terms may apply when its services are used.
GRIND uses RevenueCat to:
Third-party infrastructure providers may process limited account and App information where necessary to:
We may use third-party providers to help identify:
Third-party AI providers may process workout or fitness-related information where required to produce AI-generated coaching responses.
We only share information with service providers where reasonably necessary to operate GRIND, provide requested functionality, maintain security, comply with applicable law or protect users.
GRIND retains personal information only for as long as reasonably necessary to:
Our general retention practices are:
Information may be retained for longer where reasonably necessary to:
Anonymous or aggregated information that can no longer reasonably identify an individual may be retained for analytics, security and service-improvement purposes.
Users may request deletion of their GRIND account and associated personal information at any time.
Where available:
If the in-App deletion option is unavailable, contact:
Use the subject:
GRIND Account Deletion Request
Where possible, the request should be sent using the email address associated with the GRIND account.
We may need to verify account ownership before completing a deletion request.
Users may also request deletion of specific personal information without deleting their entire account by contacting the same email address and explaining which information they would like removed.
Following verification, applicable account information and associated personal information, including profile information, fitness preferences, workout records, progress information and saved routes, will normally be deleted or irreversibly anonymised within 30 days.
Certain information may be retained where necessary for legal, security, fraud-prevention or dispute-resolution purposes.
Account deletion is permanent and may not be reversible.
Deleting a GRIND account does not necessarily cancel an active App Store or Google Play subscription.
Subscriptions must also be cancelled separately through the relevant Apple App Store or Google Play subscription-management settings.
We use reasonable administrative, technical and organisational safeguards designed to protect personal information against:
Data transmitted between GRIND and supported services is protected using encrypted connections such as HTTPS where applicable.
However, no electronic storage or internet transmission system can be guaranteed to be completely secure.
Depending on your location and applicable law, you may have rights relating to your personal information, including the right to:
Requests may be sent to:
We may request reasonable information to verify the identity or account ownership of the individual making the request.
Users can also control permissions such as location access through their device settings.
GRIND is not directed towards children under the age of 13.
We do not knowingly collect personal information from children under the age of 13.
If a parent or guardian believes that a child under 13 has provided personal information to GRIND, they should contact:
We will investigate the request and delete the relevant information where appropriate.
Some third-party service providers used by GRIND may process information in countries outside the country in which you live.
Where required by applicable law, we take reasonable steps to ensure appropriate safeguards are used when personal information is transferred internationally.
We may update this Privacy Policy when:
The updated Privacy Policy will be published on this page and the Last updated date will be changed accordingly.
Where required by law, users may also be provided with additional notice of material changes.
For privacy-related questions, requests, complaints or account-deletion enquiries, contact:
Montrose Labs