Privacy Policy

Nightmark is provided by Baseframe Labs, an independent studio operated by Abhi Yoheswaran. In this policy, “we” means the operator of Nightmark. For privacy questions or requests, email support@baseframelabs.com.

This policy covers the native Nightmark app on iPhone and iPad, its widgets and Apple Watch companion. Visiting this website is separate from using the app. Our website Privacy Policy explains website hosting, Vercel Analytics, optional newsletter subscriptions delivered through Resend, and website contact practices. The app statements below do not describe website analytics or email subscriptions.

With your permission, Nightmark reads existing Apple Health information through HealthKit:

• Sleep records, including duration, timing and recorded sleep stages.
• Heart rate and heart rate variability (Apple Health’s SDNN measurement).
• Respiratory rate, blood oxygen and sleeping wrist temperature.
• Resting heart rate and cardio fitness (VO2 max).
• Active energy and workouts.

Available information depends on your recording source, hardware, existing records and permissions. Not every measurement is available to every user. Access is read-only: Nightmark does not add or change Apple Health records.

Nightmark uses these records to show sleep summaries and trends, calculate personal baselines and wellness insights, compare activity and vitals with sleep patterns, estimate sleep debt, and suggest bedtime plans. Travel adjustments use time-zone context. The app does not request GPS/location or contacts access.

Ratings, typical ranges and recommendations are general-wellness estimates. They are not clinical measurements or medical advice. An observed association does not establish what caused a change in your sleep.

Nightmark processes your Health records on your device and does not automatically upload them to Baseframe Labs. No Nightmark account is required, and there is no Nightmark backend that receives your Health records.

The app stores cached sleep records, calculated baselines and insights locally, along with preferences and home/travel time-zone context. The current app has no integrated advertising, tracking or third-party analytics SDK, and does not automatically send usage analytics to us. We do not sell your Health records or use them for advertising.

Apple’s App Store privacy labels use a specific definition of developer collection. Accessing information locally and choosing to send a support email are different activities. This policy explains both; it does not mean the app never accesses information.

Sleep summaries may also be available in your widgets and on your paired Apple Watch. Information shown there may be visible to someone who can view those surfaces. You control which widgets you add and how you use the companion app and your device’s display and lock settings.

You can choose to share a sleep summary using the system share sheet. The preview includes text and an optional sleep-stage graphic generated locally. Nightmark remembers whether you chose to include the image. The shared summary excludes heart rate and HRV.

Review the preview and destination before sending. An external app or recipient handles what you share under its own practices and may retain or forward it. Baseframe Labs does not control that destination.

Notifications are optional and use generic wording by default. If you opt into personal details, those details may appear on your lock screen depending on your device settings.

You can change reminder choices in Nightmark and manage notification permission and preview visibility in system settings. Delivery depends on device settings and system behavior, so reminders are not guaranteed to arrive. This feature does not automatically upload notification information to Baseframe Labs.

Feedback opens an email composer addressed to support@baseframelabs.com. It prefills the app version, iOS version and device model. You can review the message and decide whether to send it.

If you send it, we receive your email address, message, the prefilled information you leave in it, and any attachments you choose to include so we can respond. The app does not automatically email diagnostics or Health records. Please avoid including sensitive Health information unless it is necessary for your request.

Support email is handled separately from the app’s local records. Contact us to ask about correspondence we hold or to request its deletion. We cannot use a support request to access or delete information stored only on your device.

Apple may independently process information for App Store distribution, TestFlight, optional diagnostics, purchases if applicable, and device backups, according to the services you use, your settings and Apple’s policies. This is separate from Baseframe Labs receiving app information.

Nightmark’s app-level CloudKit synchronization is disabled. This does not disable Apple device backups or other system synchronization. See Apple’s privacy information and your Apple settings for those services. Links you open and destinations you share to have their own policies.

You can grant, change or revoke Nightmark’s Health access using Apple’s Health permission controls. Revoking access stops further reading of the affected data; it does not itself clear records already cached by Nightmark. You can manage original records in Apple Health. Apple provides instructions for managing Health data and app access.

Local cached records and derived insights remain available until cleared or removed from the device. Clearing Nightmark’s sleep cache removes cached sleep records and calculated insights and baselines. It does not delete the originals in Apple Health or necessarily reset all preferences. With permission, the app can read the originals again.

Removing the app does not promise deletion of every related item. A device-only Keychain marker used to recognize early-adopter access may survive reinstallation. Apple backups, Watch/widget copies, information you shared and support correspondence have separate controls and deletion processes.

Depending on the law that applies to you, you may have rights to access, correct or delete personal information, restrict or object to processing, receive a portable copy, or withdraw consent. You may also complain to your local data protection authority. These rights depend on the circumstances and applicable law.

Email support@baseframelabs.com to make a request about information we hold, such as support correspondence. We will consider your request under applicable law. For Health records and local app information we do not hold, use the device controls described above; we cannot retrieve those records for you.

We will update this page and its effective date when our practices change. Material changes will be described here. You can contact support@baseframelabs.com with questions about an update.