Last updated: August 22, 2026

Terms of Service

Ketonaut is operated by Ketonaut LLC, a New Jersey limited liability company ("Ketonaut," "we," "us"). These terms are an agreement between you and Ketonaut LLC, and they govern your use of the Ketonaut app and the ketonaut.app website. By creating an account or using Ketonaut, you agree to them. If you don't agree, don't use Ketonaut.

Ketonaut is pre-launch. Features described here — including the Coach, biomarker logging, device import, and subscriptions — may not be available yet. These terms are written to cover the service as it will operate, and will be updated as it changes.

1. Ketonaut is not medical advice

Read this section even if you skip the rest

Ketonaut is an educational and tracking tool. It is not a medical device, it does not diagnose or treat anything, and nothing in it is medical advice.

The Coach is not a clinician and is not reviewed by one. Its responses are generated by an AI model. No medical professional reviews your conversations or the guidance you receive.
Do not use Ketonaut to make medical decisions — including changing, starting, or stopping any medication, insulin dose, or treatment.
Talk to a qualified clinician before starting a ketogenic diet, and especially if you take insulin or a sulfonylurea, have type 1 or type 2 diabetes, have kidney or liver disease, are pregnant or breastfeeding, have a history of an eating disorder, or take medication whose dose depends on your diet or fluid and electrolyte balance. A ketogenic diet can meaningfully change blood glucose and electrolyte status, and medication doses may need to be adjusted by the person who prescribed them.
Never disregard or delay professional medical advice because of something Ketonaut or the Coach told you.
In an emergency, call your local emergency number. Ketonaut is not monitored and cannot help you.

Readings you enter or import — including from a Keto-Mojo meter — are recorded for your own tracking. Ketonaut does not validate them, does not act on them, and is not a substitute for the meter's own instructions or your clinician's interpretation.

2. Who may use Ketonaut

You must be at least 18 years old, and old enough to form a binding contract where you live, to use Ketonaut. If you are under 18 you may not use Ketonaut, and a parent or legal guardian cannot accept these terms on your behalf.

This is deliberate rather than administrative. Ketonaut sets calorie and carbohydrate targets and asks you to track against them every day, and that is not an appropriate tool for children or adolescents. If you are under 18 and want to change how you eat, do it with a parent or guardian and a pediatrician or registered dietitian rather than with a tracking app.

Ketonaut is offered in the United States only. The app is published to the United States storefronts of the App Store and Google Play, and the web app at ketonaut.app is intended for users in the United States. We do not offer or market Ketonaut to users elsewhere, and we may decline to provide the service outside the United States. If we expand to other countries we will say so here first.

3. Your account

Give us accurate information when you sign up, and keep it current.
You are responsible for keeping your password and your device secure, and for activity under your account.
Tell us at support@ketonaut.app if you believe your account has been compromised.
One account per person. Don't share it.

How we handle the data in your account is covered by our Privacy Policy, which forms part of these terms.

4. Acceptable use

Don't:

use Ketonaut for anything unlawful, or to harm anyone;
try to access another user's data, or any part of our systems you weren't given access to;
reverse-engineer, decompile, or attempt to extract source code or API credentials from the app;
scrape, bulk-extract, or resell data from Ketonaut, including the nutrition data we license from third parties;
use automated means to hit our services, or deliberately circumvent quotas, rate limits, or the subscription gate;
upload malicious code, or anything that interferes with the service for other people;
use Ketonaut to provide medical advice or clinical services to anyone else.

5. Your content

Everything you log — meals, recipes, supplements, readings, and Coach messages — stays yours. You grant us only the licence we need to run the service for you: to store, process, and display your content back to you, and to transmit the relevant parts to the service providers listed in our Privacy Policy so features like food search and the Coach can work.

We do not claim ownership of your content, we do not sell it, and we do not use it to train AI models.

6. Third-party data and services

Ketonaut depends on services we don't control, and their availability and accuracy are not something we can guarantee.

Nutrition data comes from USDA FoodData Central (public domain) and the FatSecret Platform API. Nutrition values — especially for branded and user-contributed foods — can be incomplete, out of date, or wrong. Always check the actual product label, particularly for allergens. Ketonaut's allergen features are a convenience built on third-party tags and cannot be relied on for a severe allergy.
The Coach is powered by an AI model operated by Anthropic. AI models can produce confident, plausible answers that are wrong. Treat Coach output as a starting point, not an authority.
Device integrations, such as importing readings from a Keto-Mojo meter, depend on that manufacturer's own hardware, app, and terms. Your use of their device and services is governed by their agreements, not ours.
Infrastructure is provided by Google Cloud and Firebase.

7. Affiliate links

Ketonaut includes links to retailers, and we may earn a commission if you buy something after tapping one. This costs you nothing extra. We disclose these links wherever they appear, and the Coach never links to anything we earn money on — its recommendations are not for sale. We are not responsible for those retailers' products, prices, terms, or privacy practices.

8. Subscriptions and billing

Ketonaut offers a free tier with monthly usage limits, and a paid subscription that lifts them. When subscriptions are available:

Billing runs through the platform you bought from — Apple's App Store, Google Play, or our web payment processor. We never receive or store your card details.
Subscriptions renew automatically at the then-current price until you cancel. Before you pay, we show you the price, what the subscription includes, the billing period, the date the first renewal will be charged, and how to cancel. You have to actively agree to those terms — we never start a recurring charge from a pre-ticked box or a step you did not take.
Deleting your Ketonaut account does not cancel your subscription. Cancel it first, or you will keep being charged.
Refunds for a subscription bought through the App Store or Google Play are handled under that store's policy. For a subscription bought on the web, contact us at support@ketonaut.app.
We may change prices. Changes apply to future billing periods, never retroactively. We will tell you before a price change affects you, and you can cancel before it takes effect.

How to cancel

Cancel through whichever route you subscribed by. Cancelling stops future renewals; you keep access through the end of the period you have already paid for.

Bought in the iPhone or Android app — cancel through your Apple or Google account subscription settings, at least 24 hours before the period ends. We cannot cancel a store subscription for you; only the store can.
Bought on the web — cancel online, at any time, from your account settings at ketonaut.app. It takes effect immediately for future renewals and needs no phone call, no email, and no explanation. If the cancellation page is ever unavailable, email support@ketonaut.app and we will cancel it and confirm in writing.

After a web purchase we email you a confirmation you can keep, setting out what you bought, the price, the billing period, the renewal date, and how to cancel.

9. Availability and changes to the service

We may change, suspend, or discontinue any part of Ketonaut. We will give reasonable notice before removing something you depend on or before shutting the service down, and you will have an opportunity to export your data. We don't promise the service will be uninterrupted or error-free.

10. Ending your use

You can stop using Ketonaut and delete your account at any time. In the app, go to Settings → Your data → Delete account. If you can't reach the app, email support@ketonaut.app from the address on your account and we will do it for you. See the Privacy Policy for exactly what gets removed. Cancel any paid subscription separately, as described in section 8 — deleting your account does not cancel it.

We may suspend or terminate an account that breaks these terms, that we're required to act on by law, or that puts the service or other users at risk. Where the situation allows it, we'll tell you why and give you a chance to put it right.

11. Intellectual property

Ketonaut — the app, the website, the name, the logo, and the software behind them — belongs to Ketonaut LLC and our licensors. These terms grant you a personal, limited, non-exclusive, non-transferable, revocable licence to use Ketonaut for your own purposes. Nothing here transfers ownership of anything.

12. Disclaimers

To the fullest extent permitted by law, Ketonaut is provided "as is" and "as available," without warranties of any kind, express or implied, including implied warranties of merchantability, fitness for a particular purpose, and non-infringement. We do not warrant that the service will meet your requirements, that it will be available or uninterrupted, that the nutrition data or Coach responses will be accurate or complete, or that any particular health or weight outcome will follow from using it.

Some jurisdictions do not allow the exclusion of certain warranties, so parts of this section may not apply to you.

13. Limitation of liability

To the fullest extent permitted by law, Ketonaut and the people who work on it will not be liable for indirect, incidental, special, consequential, exemplary, or punitive damages, or for lost profits, lost data, or health outcomes arising from your use of or inability to use the service.

Our total liability for any claim relating to Ketonaut is limited to the greater of the amount you paid us in the twelve months before the claim, or fifty U.S. dollars.

Nothing in these terms limits liability that cannot be limited by law — including liability for death or personal injury caused by negligence, for fraud, or for anything else a jurisdiction does not permit to be excluded. If you are a consumer, you keep every right your local consumer-protection law gives you, and nothing here overrides it.

14. Indemnity

You agree to indemnify us against claims, losses, and reasonable costs arising from your misuse of Ketonaut, your breach of these terms, or your violation of someone else's rights. This does not apply to claims arising from our own acts or omissions.

15. Changes to these terms

We may update these terms as Ketonaut changes. We will update the date at the top, and for material changes we will notify you in the app or by email before they take effect. Continuing to use Ketonaut after a change means you accept the updated terms; if you don't accept them, delete your account.

16. Governing law

These terms are governed by the laws of the State of New Jersey and applicable United States federal law, without regard to conflict-of-laws rules. The state and federal courts located in New Jersey have jurisdiction over any dispute arising from these terms or your use of Ketonaut.

If you are a consumer resident elsewhere, this does not deprive you of the protection of mandatory consumer-law provisions where you live, and you may bring proceedings in your local courts where local law gives you that right. Nothing here prevents either of us from bringing a claim in small-claims court.

17. General

If any provision of these terms is unenforceable, the rest stays in effect.
Not enforcing a provision doesn't waive it.
You may not transfer your rights under these terms; we may transfer ours in connection with a merger, acquisition, or sale of assets, on notice to you.
These terms and the Privacy Policy are the entire agreement between us about Ketonaut.

18. Contact

Ketonaut LLC, a New Jersey limited liability company.

1028 Sunside Avenue
Woodbury Heights, NJ 08097
United States

Questions about these terms, and legal notices: admin@ketonaut.app. For account help, data requests, and everything else: support@ketonaut.app.

19. If you downloaded Ketonaut from the Apple App Store

These terms apply to the version of Ketonaut you download from Apple's App Store, with the following additions. Where anything in this section conflicts with the rest of these terms, this section governs for that version of the app.

These terms are between you and Ketonaut LLC only, not with Apple. Ketonaut LLC, not Apple, is solely responsible for Ketonaut and its content. These terms do not conflict with the Apple Media Services Terms and Conditions.
Scope of licence. The licence granted in section 11 is a non-transferable licence to use Ketonaut on any Apple-branded product that you own or control, as permitted by the Usage Rules in the Apple Media Services Terms and Conditions — except that Ketonaut may be accessed and used by other accounts associated with you via Family Sharing or volume purchasing.
Maintenance and support. Ketonaut LLC is solely responsible for providing any maintenance and support services for Ketonaut — reach us at support@ketonaut.app. You and we acknowledge that Apple has no obligation whatsoever to furnish any maintenance and support services with respect to Ketonaut.
Warranty. Ketonaut LLC is solely responsible for any product warranties, whether express or implied by law, to the extent not effectively disclaimed. If Ketonaut fails to conform to any applicable warranty, you may notify Apple, and Apple will refund the purchase price of the app to you. To the maximum extent permitted by law, Apple has no other warranty obligation whatsoever with respect to Ketonaut.
Product claims. Ketonaut LLC, not Apple, is responsible for addressing any claim by you or a third party relating to Ketonaut or your possession and use of it, including product liability claims, any claim that Ketonaut fails to conform to a legal or regulatory requirement, and claims arising under consumer protection, privacy, or similar legislation.
Intellectual property claims. If a third party claims that Ketonaut infringes their intellectual property rights, Ketonaut LLC, not Apple, is solely responsible for the investigation, defence, settlement, and discharge of that claim.
Legal compliance. You represent that you are not located in a country subject to a U.S. Government embargo or designated as a "terrorist supporting" country, and that you are not listed on any U.S. Government list of prohibited or restricted parties.
Third-party terms of agreement. You must comply with any applicable third-party terms when using Ketonaut — for example, your wireless data plan's terms of service.
Third-party beneficiary. Apple and Apple's subsidiaries are third-party beneficiaries of these terms, and upon your acceptance of them Apple will have the right — and will be deemed to have accepted the right — to enforce these terms against you as a third-party beneficiary.
Developer name and address. Questions, complaints, or claims about Ketonaut should be directed to Ketonaut LLC, 1028 Sunside Avenue, Woodbury Heights, NJ 08097, United States, or by email to admin@ketonaut.app.