Privacy Policy

Last updated: 22 July 2026

Macrosaurus (“we”, “us”) is an adaptive macro and body-composition tracker. We try to collect as little as we need to run the app, and to keep what we do hold under your control.

What we collect

• Account details — the email address you sign up with, used to sign you in and contact you about your account.
• Your tracking data — the food, weight, check-ins, recipes and goals you enter, so the app can show your progress and retune your targets.
• Connected Google Health data (optional) — if you connect Google Health, a limited set of read-only fitness and health signals (see “Connecting Google Health” below). This is entirely optional and off until you connect.
• Basic technical data — the minimum needed to keep you signed in and to keep the service secure and working.

Where it lives

Your data is stored with our hosting provider (Supabase) under row-level security, which means each account can only read and write its own rows. We do not sell your data, and we do not share it with advertisers.

How long we keep it

We keep your data for as long as your account is active. If you close your account or ask us to delete it, we remove your personal data, other than anything we’re required to keep for legal or accounting reasons.

Where in the world

Some of our providers (such as Supabase and Google) may process data outside the UK. Where that happens, we rely on those providers having appropriate safeguards in place for international transfers.

AI features

Some features are powered by AI: the label scan and meal estimate, the recipe importer, and your buddy’s coaching notes and chat. These run through our own server, which passes your request to Anthropic (the Claude API) and returns the result. We never expose an AI provider key to the app, and you do not need to supply one.

When you use one of these features, only the content that feature needs is sent: the photo or text you submitted, or a short snapshot of the figures shown on your screen. Anthropic processes it on our behalf to return that single answer. Under Anthropic’s API terms, your content is not used to train their models, and we do not use it to train any model of our own.

Connecting Google Health

Connecting Google Health is optional. If you choose to connect it, Macrosaurus requests read-only access to a limited set of daily fitness and health signals so it can show your movement, sleep and recovery and adapt your coaching:

• Activity — daily step counts.
• Sleep — time asleep and, where your device reports them, sleep stages (deep, REM, light, awake).
• Health metrics — heart-rate variability (HRV), resting heart rate, and blood-oxygen (SpO₂).

We use this data only to power features you can see in the app — your Move, Sleep and Readiness dials, your sleep and readiness scores, streaks and coaching. Specifically:

• Access is read-only. We never write to, or change, your Google Health data.
• Your Google sign-in tokens are held securely on our server and are never exposed to the app or to any third party. The health readings are stored on your own account under row-level security, readable only by you.
• We do not sell this data, use it for advertising, or transfer it to data brokers, advertisers, or anyone else for their own purposes. We do not use it to develop, improve or train AI or machine-learning models, and we do not allow anyone we work with to do so.
• The one place it leaves our systems: if you use the AI coaching features (your buddy’s “deeper dive” and chat), a small snapshot of the figures on your screen is sent to Anthropic, our AI provider, to write that one reply. Where you have connected Google Health, that snapshot can include three derived daily values: your readiness score, your hours asleep last night, and today’s step count. It never includes raw Google Health records, your Google account details, or your Google tokens. Anthropic acts purely as our processor: it returns the reply and, under its API terms, does not use the content to train its models. If you do not use the AI coaching features, no Google Health data is sent to any third party at all.
• You can disconnect at any time from Settings in the app, or revoke access directly at myaccount.google.com/permissions. Disconnecting stops all future syncing and deletes the stored Google connection.

Limited Use of Google user data

Macrosaurus’s use and transfer to any other app of information received from Google APIs will adhere to the Google API Services User Data Policy, including the Limited Use requirements, and to any additional requirements that apply to Google Health and Fitness data. In particular, information obtained through Google Health is used only to provide and improve the user-facing features described above; is not transferred to others except as necessary to provide those features, with your consent, or as required for security or law; is not used for advertising; and is not read by humans unless you have given consent, it is necessary for security or to comply with the law, or the data has been aggregated and anonymised.

This applies to our use of AI as well. Neither the raw data we receive from Google APIs nor anything derived or aggregated from it is used to develop, improve or train any AI or machine-learning model, ours or a third party’s. Where an AI provider processes this data to deliver a feature you asked for, it does so as our processor, under terms that prohibit training on that content.

Cookies & analytics

We use the storage needed to keep you signed in. We do not run third-party advertising trackers. If we add privacy-respecting analytics later, we will update this page first.

Your rights

Under UK GDPR you can ask us to access, export, correct or delete your data, and you can close your account at any time. To make a request, email olly@macrosaurus.com and we will action it.

Children

Macrosaurus is not intended for children under 16. If you believe a child has created an account, contact us and we will remove it.

Changes

If this policy changes in a meaningful way, we will update the date above and, where appropriate, let you know in the app.

Contact

Questions about your data? Email olly@macrosaurus.com.