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DawnCup

Workout intensity tracker for Apple Watch and Wear OS

Last updated: 2026-08-05

Overview

DawnCup is a workout intensity tracker for Apple Watch and Wear OS smartwatches. It runs on your watch to measure workout intensity using heart rate and motion sensors during fitness and activity sessions. On Apple Watch, heart rate is read through Apple HealthKit and completed workouts can be saved back to the Apple Health app; on Wear OS, heart rate is read through Android Health Services. There is also a phone companion app that acts as a read-only viewer for event leaderboards.

By default, everything stays on your watch. Heart rate, motion sensors, and workout history are read from your watch's sensors, stored locally in a private database, and never transmitted unless you explicitly opt in.

DawnCup does not require an account, a sign-in, or any personal information to use. It never asks for your email address, phone number, location, or contacts, and it uses no advertising SDK.

One exception is worth stating plainly: if you post a workout to an event leaderboard, you type a display name yourself, and that name is published on a public scoreboard alongside your score. Type whatever you want shown on the screen in the room - a first name, a nickname, or nothing recognisable. Nothing is posted to a leaderboard unless you tap Share and choose a channel.

Data Collection

By default: stays on your device

These items are read and stored on your device only. Nothing is transmitted unless you explicitly opt in.

  • Heart rate - Compute intensity zones and workout score during a workout session. Read via Apple HealthKit on Apple Watch, and via Android Health Services on Wear OS. DawnCup reads heart rate only while a workout session is active, and uses it for nothing else.
  • Motion sensors (accelerometer and gyroscope) - Detect exercise activity and movement intensity
  • Workout metadata - Start/end time, duration, intensity score, zone breakdown - stored locally with your workout history
  • Workout saved to Apple Health (Apple Watch only) - On Apple Watch, DawnCup asks permission to save each finished session to the Apple Health app as a workout, so it appears alongside your other activity. This writes data to your own device's Health store - it is not transmitted to us, and you can decline this permission and still use the app.
  • Device model and OS version - Stored with each workout for calibration and compatibility

Opt-in: uploaded only with your consent

These items are transmitted only if you enable the corresponding feature. Opting out prevents future uploads.

  • Pseudonymous device identifier - A random UUID generated on first install, used to link your uploaded workouts together for calibration analysis. Contains no personal information.
  • Workout record (for upload) - When you opt in to workout upload, the anonymized workout record - heart rate samples, motion trace, intensity score - is transmitted to the calibration backend
  • Display name you type when posting to an event leaderboard - Identifies your entry on that event's public scoreboard. You choose the text at the moment you share (up to 24 characters); DawnCup does not read it from your watch, your Apple or Google account, or any other source. If the name you choose is already on that board, a numeric suffix is added so two entries do not overwrite each other.
  • Event leaderboard entry - When you post to an event leaderboard, your display name, intensity score, workout duration, and the time you posted are stored against that event's join code and shown publicly to anyone who has the code

Bug reports only

These items are included only when you manually submit a bug report or feedback from within the app.

  • Crash stack traces and app logs - When you submit a bug report via XrayKit, recent app logs and crash details are included to help diagnose the issue

Opt-In Features

The following features transmit data only if you explicitly enable them. They are off by default.

Workout upload

Off by default. If you turn it on, completed workouts are transmitted to our calibration backend at lincinnovations.com. The upload includes heart rate samples, motion sensor trace, intensity score, and a pseudonymous device identifier. The workout file is uploaded to private storage using a short-lived signed link, then confirmed. You can disable this at any time on the summary screen.

https://lincinnovations.com/api/sensor/presign-motion-upload

Workout sharing

Tap 'Share' on a completed workout to generate a shareable link. The shared record contains the same fields as an uploaded workout plus any caption you add. Sharing is one-tap and per-workout - nothing is shared without your explicit action.

https://lincinnovations.com/api/dawncup/share

Event leaderboard

At an event, tap 'Share' on a finished workout, pick the event channel, and type the display name you want on the board. Your name, score, duration, and post time are sent to our backend and appear on a public scoreboard at lincinnovations.com/dawncup/board for anyone holding that event's join code - typically projected on a screen in the room. Reading a board requires no sign-in by design, so treat anything you post as public. Nothing is posted automatically when a workout ends; every entry is a deliberate tap.

https://lincinnovations.com/api/dawncup/leaderboard

Bug reports via XrayKit (Wear OS version only)

On the Wear OS version, if you submit a bug report from within DawnCup, XrayKit will include your written description, a crash stack trace (if applicable), recent app logs, device model, and OS version. Bug reports are submitted to our Firebase-hosted backend and used solely to diagnose and fix issues. The Apple Watch and iPhone versions do not include this feature.

Third-Party Services

DawnCup interacts with the following third-party services. It uses no advertising SDKs, no analytics trackers, and no social media integrations.

  • Apple HealthKit (Apple Watch) - Reading heart rate during active workouts, and saving finished workouts to your Apple Health app. HealthKit data stays on your device and under Apple's control; DawnCup never uses health data for advertising, and never discloses it to a third party.
    When used: Always (required for core functionality) · Privacy policy
  • Android Health Services (Wear OS) - Reading heart rate during active workouts
    When used: Always (required for core functionality)
  • Firebase (Google) - Wear OS version only - Backend for XrayKit bug reports. The Apple Watch and iPhone versions of DawnCup do not include Firebase or XrayKit and send no bug-report data.
    When used: Only when you submit a bug report · Privacy policy
  • AWS (Amazon) - Calibration backend hosted by LINC Innovations at lincinnovations.com
    When used: Only if you opt in to the corresponding feature

Data Retention

  • Local data: Until you uninstall the app or clear storage. Uninstalling DawnCup permanently deletes all local workout data.
  • Uploaded data: Uploaded workout records are kept indefinitely, keyed by your pseudonymous device identifier. Reinstalling DawnCup generates a new identifier, and previously uploaded data can no longer be associated with your new install. Event leaderboard entries are different: each entry is deleted automatically 30 days after it is posted, and the event itself expires 90 days after it is created. To have an entry removed sooner, email hello@lincinnovations.com with the event join code and the display name you used.
  • Bug reports: Wear OS version only: bug reports are retained for 12 months, then deleted. The Apple Watch and iPhone versions send no bug reports.

Children's Privacy

DawnCup is not directed at children under 13. We do not knowingly collect data from children under 13. If you hand your watch to a child at an event, pick a display name that does not identify them - the board is public to everyone holding the join code. If you believe a child has submitted data, please contact us at hello@lincinnovations.com and we will investigate.

Your Rights

Residents of California (CCPA), the European Union (GDPR), and similar jurisdictions have the right to access, correct, or delete personal data held about them, and to opt out of certain data uses. Because DawnCup does not collect personal identifiers tied to individuals, some of these rights may not apply as usually framed. Contact us at hello@lincinnovations.com to exercise any rights under applicable law.

Changes to This Policy

We may update this policy as DawnCup evolves. Changes will be reflected in the “Last updated” date at the top of this page. Material changes will be announced in-app when possible.

Contact

Questions about this policy? Email hello@lincinnovations.com.

LINC Innovations LLC · Washington State, USA