By using ketocypher.com, joining the waitlist, or installing the KetoCypher Android app, you agree to these terms. KetoCypher is operated by Optikal Development, a sole proprietorship based in Colorado Springs, Colorado, USA (referred to here as "we" or "KetoCypher"). These terms apply to us and to you, the user.
Effective: July 4, 2026. This update names the operating entity, clarifies that Premium Backup billing and refunds are handled by Google Play, and adds the in-app self-service account and data deletion flow.
KetoCypher is a personal nutrition and biometric tracker for adults running a keto or carnivore diet. It is a wellness and self-tracking tool. It is not a medical device. It does not diagnose, treat, cure, or prevent any disease. Nothing in the app, on this website, or in any communication from us is medical advice. If you are managing a medical condition, work with a qualified clinician.
You must be at least 18 years old to use KetoCypher. It is a health and wellness tool intended for adults, and is not directed at or intended for anyone under 18. KetoCypher is offered only to users in the United States.
You are responsible for your account credentials and your 12-word recovery phrase. The architecture is zero-access: we cannot read your data, and we cannot recover it for you if you lose both your password and your recovery phrase. Keep the recovery phrase somewhere safe.
One account per person. Do not share credentials.
Your data is yours. Everything you log stays encrypted under keys we never hold. We claim no ownership of it and no license to it beyond storing and transmitting the encrypted blobs you choose to send us for backup. We do not analyze, mine, sell, or train on your data, because we cannot read it.
We grant you a personal, non-exclusive, non-transferable, revocable license to install and use the KetoCypher app and website for your own personal, non-commercial use, subject to these terms. We and our licensors keep all rights in the software, brand, and site content; this license transfers none of those rights to you.
Don't:
Security research and responsible disclosure are welcome. Email support@ketocypher.com before testing anything that could affect other users.
The Free tier is free, with all in-app features. Premium Backup is a paid subscription that adds encrypted cloud backup. Pricing is shown on the landing page and inside the app at sign-up. We may change Premium Backup pricing over time; if we do, current subscribers get notice before any renewal at the new price, and can cancel before it takes effect.
Premium Backup is sold as an auto-renewing subscription through Google Play Billing, with Google as the merchant of record. Your subscription renews until you cancel it, and you can cancel at any time in Google Play (Play Store → Subscriptions), which the app links to from Settings. Because Google is the merchant of record, billing, renewals, cancellations, and refunds are handled by Google Play under your Google account and Google Play's terms. If you cancel mid-cycle, you keep Premium Backup features until the end of the current billing period; we do not separately pro-rate refunds for unused time, though you may request a refund through Google Play where its policy or your local law allows.
For Premium Backup subscribers, we store encrypted backup blobs on our servers. We retain up to 5 rolling versions per account. If your subscription lapses through cancellation or an unresolved payment failure, your blobs enter a 30-day grace period during which you can re-subscribe and keep them. We will email you before that period ends. If it passes without resolution, we delete the encrypted blobs. Because they are end-to-end encrypted, once deleted they cannot be recovered by us or anyone else. We will not "hold them for ransom" against a future re-subscription.
You can stop using the service at any time. To delete your data, open the app and go to Settings → Account → "Delete account or data," where you can delete your cloud backups and keep your account, or permanently delete your entire account and all server-side data. Both take effect immediately and cannot be undone. You can also email support@ketocypher.com from the address on file. See ketocypher.com/delete-account for the full process.
We may suspend or terminate accounts that violate these terms, are clearly automated abuse, or where required by law. Where possible we will give notice first, and unless the law or the nature of the abuse prevents it, we will give you a reasonable window to export your data from the app before the account is closed. Your on-device data is unaffected either way and stays readable with your password or recovery phrase.
The service is provided "as is" and "as available," without warranties of any kind, express or implied. We do not warrant that the service will be uninterrupted, error-free, or fit for any particular purpose. The accuracy of nutrition data, biometric correlations, and on-device insights is offered for personal informational use, not as medical or dietary prescription.
To the maximum extent permitted by law, KetoCypher is not liable for indirect, incidental, consequential, or punitive damages, or for loss of data, profits, or goodwill, arising from your use of the service. Where liability cannot be excluded, our aggregate liability is limited to the greater of (a) the amount you paid us in the 12 months before the claim, or (b) USD $20.
Nothing in these terms limits or excludes any right you have under mandatory law that cannot be waived by agreement. Some jurisdictions do not allow the exclusion of implied warranties or the limitation of certain damages; where that is the case, the disclaimers and limitations above apply only to the extent permitted, and your mandatory local-law rights remain intact.
If we change these terms materially, we will update the "Effective" date and call out the change at the top of this page. For material changes, we will also email account holders in advance. Continued use after a change takes effect means you accept the updated terms.
These terms are governed by the laws of the State of Colorado, United States, without regard to conflict-of-laws rules. Any dispute that cannot be resolved by good-faith correspondence will be brought in the state or federal courts located in Colorado, and you and KetoCypher consent to that venue. If you are a consumer, this venue and choice of law does not deprive you of the protection of any mandatory consumer-protection rules of the U.S. state where you reside.
Severability. If any provision of these terms is held invalid or unenforceable, that provision is limited or removed to the minimum extent necessary, and the remaining provisions stay in full effect.
Entire agreement. These terms, together with the Privacy Policy and any promo-code terms that apply to you, are the entire agreement between you and us about the service, and supersede any prior understanding on that subject.
Assignment. You may not assign or transfer these terms without our consent. We may assign them to a successor in connection with a merger, acquisition, or sale of assets, on notice to you, without diminishing your rights under these terms.
No waiver. If we do not enforce a provision, that is not a waiver of our right to enforce it later.
General questions: hello@ketocypher.com. Account, billing, or security: support@ketocypher.com.