daygreen

Draft Last updated 10 November 2026

Privacy Policy

Daygreen is built to know as little about you as possible. There is no account, no ads and no tracking. Your log lives on your iPhone and, if you choose, in your own iCloud. This policy explains the few things that do leave your device, and why.

The short version

  • Your food log, weight and settings are stored on your device and, if you turn on sync, in your private iCloud. We cannot see them.
  • With your permission, Daygreen reads workouts, weight and active energy from Apple Health. Health data is never sold, never shared with third parties and never used for advertising.
  • When you describe a meal, that text is sent through our server to a language model to estimate calories. No account, name or email address is attached to it.
  • Subscriptions are handled entirely by Apple. We never see your payment details.
  • There are no ads, no analytics SDKs and no third-party trackers in the app or on this website.

Who is responsible

The controller for the processing described here is:

Chapter3 B.V.
Nijverheidsweg 16 d
3534 AM Utrecht
Netherlands
Chamber of Commerce (KvK): 81052669
Email: privacy@daygreen.app

What Daygreen stores, and where

On your device and in your iCloud

Everything you log (meals, weigh-ins, budgets, settings and the colour of each day) is stored on your iPhone. If you turn on iCloud sync, a copy is kept in the private iCloud database of your own Apple Account, so it comes back when you reinstall the app or get a new iPhone. This data is encrypted by Apple and is not accessible to us. Apple’s privacy policy applies to iCloud.

Apple Health

If you allow it, Daygreen reads three kinds of data from Apple Health: workouts, body weight and active energy. Daygreen uses this data on your device to calculate your day, for example to give calories back after a workout. You can change these permissions at any time in the Health app.

We are strict about Health data:

  • It is never sold.
  • It is never shared with third parties, including advertisers and data brokers.
  • It is never used for advertising, marketing or profiling.
  • It is not sent to our server.

Figures that Daygreen derives from Health data, such as the calories a workout earned back, are stored with the rest of your log: on your device and, if sync is on, in your own iCloud.

Food descriptions

When you describe what you ate in plain language (“two eggs and toast”), Daygreen sends that text to our own server. The server passes it to a large language model, which returns an estimate of calories and nutrients. The request contains the text you typed. It does not contain your name, email address, Apple Account, Health data or any account identifier, because Daygreen has no accounts. Like any internet request, it comes from your IP address. Cloudflare uses that only to deliver and protect the service, and we don’t store it.

To protect the service from abuse, our server checks that each request comes from a genuine copy of Daygreen (using Apple’s App Attest) and counts the number of requests per installation over a rolling 24 hours. For this it uses a random key that belongs to the installation, not to you as a person. Our server does not keep the text of your food descriptions after it has returned the estimate.

Don’t type anything into the food field you’d rather keep private, such as names or medical details.

Subscriptions

Daygreen subscriptions and free trials are sold and managed by Apple through the App Store. Apple processes your payment. We receive only the information the App Store gives every developer, such as whether a subscription is active, and aggregated sales reports. We never receive your name or payment details from Apple.

Crash reports

If you have chosen in iOS settings to share analytics with app developers, Apple may send us anonymous crash reports and usage statistics. You control this in Settings › Privacy & Security › Analytics & Improvements.

Email

If you write to us, we use your email address and message only to reply and keep a record of the conversation.

This website

This website sets no cookies of its own and uses no analytics or tracking. It is hosted on Cloudflare, which processes technical data such as IP addresses to deliver the site and protect it against attacks.

  • Health data and food descriptions may reveal information about your health. We process them only with your explicit consent (Article 6(1)(a) and Article 9(2)(a) GDPR), which the app asks for before you first connect Apple Health or describe a meal. You can withdraw it at any time in the app’s settings, or by turning off Health access in the Health app.
  • Providing the app and your subscription is necessary to perform our agreement with you (Article 6(1)(b) GDPR).
  • Preventing abuse and keeping our server and website secure is our legitimate interest (Article 6(1)(f) GDPR).
  • Answering your email is our legitimate interest in helping you (Article 6(1)(f) GDPR).

Who else is involved

We use a small number of service providers who process data on our behalf, under a data processing agreement:

  • Cloudflare hosts our server and this website.
  • A language model provider, reached through our server, estimates calories from food descriptions.

Apple provides the App Store, iCloud and Apple Health under its own terms and privacy policy.

Some of these providers may process data outside the European Economic Area, for example in the United States. Where that happens, we rely on safeguards required by the GDPR, such as the EU–US Data Privacy Framework or the European Commission’s Standard Contractual Clauses.

How long we keep data

  • Your log stays on your device and in your iCloud until you delete it.
  • Food descriptions are not kept on our server after the estimate is returned.
  • The per-installation request count expires after 24 hours.
  • Emails are kept as long as needed to help you, and no longer than two years after our last contact.

Your rights

Under the GDPR you have the right to access, correct and delete your personal data, to restrict or object to its processing, to data portability, and to withdraw consent at any time. Because your log stays on your device and in your own iCloud, you can view, change and delete it yourself in the app. To exercise any of your rights, email privacy@daygreen.app. We will reply within one month.

You also have the right to lodge a complaint with a supervisory authority. In the Netherlands, that is the Autoriteit Persoonsgegevens (autoriteitpersoonsgegevens.nl).

Deleting your data

  • To delete everything on your iPhone, delete the Daygreen app.
  • To delete your iCloud copy, open Settings › [your name] › iCloud, manage your storage, choose Daygreen and delete its data.
  • To stop Daygreen reading Health data, open the Health app, tap your profile picture, then Apps, then Daygreen.

Age

Daygreen is meant for adults. It is not intended for anyone under 18.

Changes

If we change this policy, we will update the date at the top of this page. If a change is significant, we will tell you in the app.

Contact

Questions about privacy? Email privacy@daygreen.app.