Privacy Policy

Effective date: June 19, 2026

Build ("Build", "we", "us", or "our") is a workout-tracking app operated by Sawdust Ventures LLC. This Privacy Policy explains what information the Build app and its companion Apple Watch app collect, how we use it, who we share it with, and the choices you have.

Questions? Email [email protected].

Information we collect

Account information

When you create an account we collect your email address. If you sign in with Apple or Google, we receive your name and email from that provider (if you use Apple's "Hide My Email," we receive Apple's private relay address instead of your real email). We use a secure authentication provider (Supabase) to manage sign-in. You can also add an optional display name and a short fitness goal to your profile.

Workout and fitness data

We store the content you create in the app: workouts, exercises, sets, weights, reps, distances, durations, RPE (effort ratings), set types, routines, folders, notes, personal records, and the dates and times of your sessions. This is the core data that makes the app work and syncs across your devices.

Photos you add

If you add a profile photo, a workout photo, or a photo to a custom exercise, that image is stored on our servers (Supabase Storage) and associated with your account so it can sync across your devices. You can remove these at any time.

Voice recordings (voice set logging)

If you use voice logging, the app records a short audio clip and sends it to our speech-to-text provider (OpenAI) to convert it to text, then uses an AI provider (Anthropic) to turn that text into a logged set. The audio is used only to generate that transcript and is processed in real time; we do not store your voice recordings, and our providers do not use this audio to train their AI models. This feature only runs when you tap the microphone — the app does not listen in the background.

Photos for routine import

If you import a routine from a photo, the image is sent to our AI provider (Anthropic) to extract the routine details. The image is used only to produce that result and is processed in real time; we do not store imported photos, and our provider does not use them to train its AI models.

Purchases & subscriptions

If you subscribe to Build's paid features (Build Pro), the purchase is processed by Apple and managed through our subscription provider (RevenueCat). We receive your subscription status and a non-identifying purchase identifier so we can unlock paid features. We never receive or store your payment card details — those stay with Apple.

Apple Health data

Apple Health is optional and off until you enable it.

• On iPhone, Build is write-only. With your permission, Build writes your completed workouts (workout type, start and end time, and an estimated active-calorie figure) to Apple Health. The iPhone app does not read any data from Apple Health.
• On Apple Watch, during a workout the watch app reads your live heart rate and active energy from Apple Health so it can show them on your wrist and save them with the workout. These values stay on your device and in Apple Health — Build does not transmit your heart rate or calorie data to our servers or any third party.

We never use Apple Health (HealthKit) data for advertising or marketing, and we never sell it.

Analytics & usage data

We use PostHog (a product-analytics service) to understand how the app is used so we can improve it — for example, how often workouts are started and finished, when voice logging is used, and when the subscription screen is viewed. These events are tied to a random, pseudonymous account identifier, never to your email or name, and include basic technical details such as your app version, operating-system version, and device type. We do not use this data to track you across other companies' apps or websites, and there is no advertising identifier (IDFA) involved. Analytics is on by default; you can turn it off any time in Settings → Privacy Settings.

Diagnostics

We use Sentry to collect crash reports and error diagnostics so we can fix bugs. This may include device type, OS version, app version, and technical error details; it is not tied to your name or email, and it does not include your workout content. Crash reporting is on by default; you can turn it off any time in Settings → Privacy Settings.

Notifications and app updates

Build's notifications (rest-timer alerts and workout reminders) are scheduled locally on your device; we do not collect a push-notification token or send you remote marketing pushes. The app also checks for over-the-air updates through Expo's update service, which receives only technical details (such as your app version and platform) needed to deliver the right update.

How we use your information

• To provide and sync the app's features across your devices.
• To transcribe voice input and extract routines from photos.
• To process subscriptions and unlock paid features.
• To understand usage and improve the app.
• To maintain, secure, and improve the app and fix crashes.
• To respond to your support requests.

We do not sell your personal information, we do not use it for third-party advertising, and we do not track you across other companies' apps or websites.

Sharing and disclosure

We share data only with the service providers that operate the app on our behalf:

These providers process data under their own privacy and security terms. We may also disclose information if required by law.

Shared links. If you share a workout, routine, or folder, we generate a link that lets anyone with the link view that content. You control whether to create a link and who you share it with.

Data retention and deletion

We retain your data while your account is active. You can delete your account from within the app: open your profile (tap your name or photo on the Profile tab), scroll to the bottom, and tap Delete Build Account. This permanently removes your workouts, routines, photos, and associated data from our systems. You may also email [email protected] to request deletion.

Security

We use industry-standard measures, including encryption in transit, row-level security on our database, and secure on-device storage for your sign-in session, to protect your data. No system is perfectly secure, but we work to safeguard your information.

Children's privacy

Build is not directed to children under 13 (or the minimum age in your country), and we do not knowingly collect their data.

International users

Your data may be processed in the United States and other countries where our service providers operate.

Changes to this policy

We may update this policy from time to time. We'll post the new effective date here and, for material changes, notify you in the app.

Contact

Sawdust Ventures LLC — [email protected]