Terms of Service

1. This agreement

These terms are a contract between you and Darkmode Ltd, a company registered in England and Wales under company number 17377649, with its registered office at 58 Bramah House, Gatliff Road, London SW1W 8DT, United Kingdom (“we”, “us”). They govern your use of the Gutli mobile application and this website (together, the “Service”).

By creating an account or using the Service you accept these terms. If you do not accept them, do not use the Service.

Our Privacy Policy explains how we handle your personal data and forms part of this agreement.

2. Gutli is not medical advice

Gutli helps you observe patterns in your own data. Observing a pattern is not the same as finding a cause, and a result produced by Gutli is not a clinical finding. It is a starting point for a conversation with someone qualified to have it.

Always seek the advice of a doctor, dietitian or other qualified healthcare professional about any medical condition, any symptom that concerns you, and before you make significant changes to your diet. Never disregard professional medical advice, or delay seeking it, because of something you read in Gutli.

Elimination protocols involve removing foods from your diet. Doing that without appropriate guidance carries real risks, including nutritional inadequacy, and it may be unsuitable for you. It is your responsibility to decide, with professional input where appropriate, whether a protocol is safe for you to run.

Do not use Gutli in an emergency. If you have severe or sudden symptoms, blood in your stool, unexplained weight loss, persistent vomiting, difficulty swallowing, or any symptom that frightens you, contact a healthcare professional or emergency services immediately.

Gutli is not appropriate for anyone with a diagnosed eating disorder or a history of disordered eating, and it is not designed for use during pregnancy, or by people with a diagnosed food allergy for whom exposure is dangerous. If any of those apply to you, speak to a healthcare professional before using it at all.

3. Who can use Gutli

You must be at least 16 years old and able to enter into a binding contract. By using the Service you confirm that you are.

You may use the Service only for your own personal, non-commercial use.

4. Your account

You sign in with Sign in with Apple. You are responsible for keeping access to your Apple ID secure, and for activity that happens under your account.

Tell us at hello@gutli.co if you believe your account has been accessed by someone else.

5. What Gutli does

Gutli lets you log meals, scan foods, record symptoms and keep a daily journal, and lets you run structured self-experiments on top of what you log. At the end of an experiment it produces a result based on the data you entered.

The quality of that result depends entirely on the quality and completeness of what you logged. Gutli tells you how confident it is, and will report an inconclusive result where the evidence does not support a conclusion. We do not guarantee that any experiment will produce a useful, actionable or correct answer, or any answer at all.

Protocol lengths, phases and the way results are calculated may change as the product develops.

6. Paying for experiments

Gutli is sold one experiment at a time. There is no subscription, and nothing renews on its own. When you want to run an experiment you buy that experiment, and that is the end of the transaction — there is nothing to cancel afterwards, and nothing will be charged to you again unless you choose to buy another one.

The price is shown in the app before you buy and confirmed by Apple at the point of purchase. Prices vary by region. Purchases are Apple in-app purchases: payment is taken by Apple through your Apple ID account, and is subject to Apple’s terms as well as these.

• What a purchase buys. One experiment, run through to a result, including the phases that make it up and the result we produce at the end.
• If the experiment does not reach a result. If it ends early — because you end it, or because we stop it for a safety reason — and no result was produced, your purchase returns to your account and can be used for another experiment. You are not charged twice for the same attempt.
• Once a result is delivered. The purchase has been used. A result you have already been shown is the thing you paid for, so it is not returned to your account afterwards.
• Refunds. Refunds for in-app purchases are handled by Apple under Apple’s refund policy, not by us. This does not affect any statutory right to a refund you may have.
• Price changes. We may change the price of an experiment. A change never affects an experiment you have already bought.

Buying an experiment does not change anything about your account or your data, and deleting your account is separate from it — see Deleting your account.

7. Your content

Your meals, symptoms, journal entries, beliefs and experiment history are yours. We do not claim ownership of them.

You give us a limited licence to store, process and display that content for the sole purpose of operating the Service for you — running your experiments, producing your results, and showing them back to you. The licence exists so that we can legally run the app on your data. It ends when you delete the content or your account.

We do not use your content to advertise to you, and we do not sell it.

We use your content only to operate the Service for you. We do not use it — anonymised, aggregated or otherwise — for product research or published statistics. If that ever changes we will update these terms and our Privacy Policy and tell you before it takes effect.

Keep your own copies of anything you cannot afford to lose. We are not responsible for content that is lost or corrupted, and account deletion is irreversible.

8. Acceptable use

You agree not to:

• use the Service to diagnose or treat anyone, including yourself or another person;
• present output from the Service as clinical or professional advice to others;
• reverse engineer, decompile or attempt to extract the source code of the app, except where the law expressly permits it;
• scrape, bulk-download, or use automated means to access the Service;
• attempt to gain unauthorised access to the Service, other users’ accounts, or our infrastructure;
• interfere with the Service’s operation, or use it to break any law;
• resell, sublicense or commercially exploit the Service.

9. Our intellectual property

The Service, including its software, protocols, methodology, design, text, and the Gutli name and logo, is owned by Darkmode Ltd or our licensors and is protected by intellectual property law.

We grant you a personal, non-exclusive, non-transferable, revocable licence to use the app on devices you own or control, for as long as you comply with these terms. Nothing else is granted.

10. Availability and changes

We aim to keep the Service available, but we do not promise it will be uninterrupted or error-free. We may suspend it for maintenance, and we may add, change or remove features.

We may discontinue the Service. If we do, we will give you reasonable notice and a way to export your data before it stops.

11. Disclaimers

To the fullest extent permitted by law, the Service is provided “as is” and “as available”, without warranties of any kind, whether express or implied, including implied warranties of merchantability, fitness for a particular purpose, accuracy and non-infringement.

We specifically do not warrant that any result, verdict, score or insight produced by the Service is accurate, complete, reliable, or applicable to you, or that acting on it will improve your symptoms or your health.

Food and ingredient information, including anything produced by scanning a product or by automated ingredient analysis, may be incomplete or wrong. Do not rely on it if you have a food allergy or any other condition where an error could harm you. Always check the actual product packaging.

12. Limitation of liability

Nothing in these terms limits or excludes our liability for death or personal injury caused by our negligence, for fraud or fraudulent misrepresentation, or for anything else that cannot be limited or excluded by law.

If you are a consumer, you have statutory rights that these terms do not affect.

Subject to the above, and to the fullest extent permitted by law: we are not liable for indirect, incidental, special or consequential loss, loss of profit, loss of data, or any health outcome arising from decisions you made using the Service; and our total liability to you for all claims arising out of or relating to the Service is limited to the total amount you paid for the Service in the 12 months before the claim arose.

You are responsible for your own dietary and health decisions. That responsibility does not transfer to us because you used an app.

13. Ending this agreement

You can stop using the Service at any time, and delete your account from inside the app.

We may suspend or terminate your access if you materially breach these terms, if we are required to by law, or if we discontinue the Service. Where it is reasonable to do so, we will tell you first and give you a chance to put things right.

Sections that by their nature should survive termination — including content ownership, disclaimers, limitation of liability and governing law — continue to apply afterwards.

14. Changes to these terms

We may update these terms. We will update the date at the top of this page, and where a change is material we will give you notice in the app or by email before it takes effect. Continuing to use the Service after that means you accept the updated terms. If you do not accept them, stop using the Service and delete your account.

15. Governing law

These terms are governed by the laws of England and Wales, and the courts of England and Wales have exclusive jurisdiction over any dispute arising from them.

If you are a consumer resident elsewhere, this does not deprive you of the protection of mandatory consumer law in your country of residence, or of the right to bring proceedings there.

If any provision of these terms is found unenforceable, the rest continues to apply.

16. Contact us

Questions about these terms go to Darkmode Ltd at hello@gutli.co, or 58 Bramah House, Gatliff Road, London SW1W 8DT, United Kingdom.

See also our Privacy Policy and our Support page.