Effective date: July 11, 2026 · Last updated: July 18, 2026
These Terms of Use ("Terms") form a binding agreement between you and Yurii Moskviak ("we", "us", "our") governing your use of the Fastum mobile application ("the App"). By downloading, accessing, or using Fastum, you agree to these Terms. If you do not agree, do not use the App. Your use of the App is also governed by our Privacy Policy, which is incorporated into these Terms by reference.
Fastum is a wellness and educational tool. It is not a medical device and does not provide medical advice, diagnosis, or treatment. The fasting-stage and refeeding information in the App is general in nature, may be inaccurate or incomplete for your situation, and must not be relied upon as a substitute for professional medical care.
Fasting — especially extended fasts of 24 hours or more — can be dangerous. You should consult a qualified healthcare professional before beginning any fast or fasting program. Do not fast, and seek medical advice, if you are pregnant, breastfeeding, under 18, taking medication, or living with a health condition such as diabetes, low blood pressure, kidney disease, or a current or past eating disorder. You use Fastum entirely at your own risk. If you feel unwell at any time, stop immediately and seek medical attention. In an emergency, call your local emergency number.
You must be old enough to consent to the processing of your personal data where you live (at least 13, and older where your jurisdiction requires), and able to form a binding contract, to use the App. If you are a minor, you may use the App only with the involvement and consent of a parent or guardian who agrees to these Terms. Fasting itself is not appropriate for minors except under professional supervision (see Section 1).
Fastum uses an account (via Sign in with Apple or email and password) so your data can be saved and synced. You agree to provide accurate information, to keep your login credentials confidential, and that you are responsible for all activity that occurs under your account. Notify us promptly at the contact address below if you suspect any unauthorized use. You may delete your account and its data at any time from within the App.
Subject to these Terms, we grant you a personal, limited, non-exclusive, non-transferable, non-sublicensable, revocable license to download and use one copy of the App on Apple devices you own or control, for your personal, non-commercial use. This license is governed by these Terms and by Apple's Licensed Application End User License Agreement (the "Apple Standard EULA"); where these Terms and the Apple Standard EULA conflict, these Terms control to the extent permitted.
Fastum offers Fastum Pro, an optional auto-renewing subscription that unlocks Custom Fast, Pro Fast, food logging, Nutrition trends, the body diagram, streak/calendar insights, share cards, and the home-screen widget. Fastum Pro is available as:
The following applies:
All purchases are processed by Apple and are subject to the App Store terms. Refunds are handled solely by Apple in accordance with its policies; we do not process refunds directly.
You agree not to: (a) copy, modify, reverse engineer, decompile, or create derivative works of the App except as permitted by law; (b) rent, lease, sell, or sublicense the App; (c) use the App unlawfully or to harm others; or (d) rely on the App as a substitute for professional medical care.
The App and all related content, design, trademarks, and software are owned by us or our licensors and are protected by intellectual-property laws. Except for the license granted above, these Terms transfer no rights to you.
If you send us ideas or feedback, you grant us a perpetual, irrevocable, royalty-free license to use it without restriction or obligation to you.
The App relies on services provided by Apple (App Store, Sign in with Apple, in-app purchases/subscriptions, and — only with your permission — Apple Health), by Convex, Inc. (our cloud backend that stores and syncs your account data), and by RevenueCat, Inc. (our subscription-management processor, which validates and manages your Fastum Pro status). Your use of those services is subject to their respective terms and policies, and we are not responsible for them.
To the fullest extent permitted by law, the App is provided "as is" and "as available", without warranties of any kind, whether express, implied, or statutory, including any implied warranties of merchantability, fitness for a particular purpose, and non-infringement. We do not warrant that the App will be accurate, uninterrupted, error-free, or that any health outcome will result from its use.
To the fullest extent permitted by law, we will not be liable for any indirect, incidental, special, consequential, exemplary, or punitive damages, or for any loss of data, profits, or health outcomes, arising from or related to your use of (or inability to use) the App. Our total aggregate liability for any claim will not exceed the greater of the amount you paid us for the App in the twelve (12) months before the claim, or ten Canadian dollars (CAD $10). Some jurisdictions do not allow certain limitations, so some of the above may not apply to you.
You agree to indemnify and hold us harmless from any claims, damages, liabilities, and expenses (including reasonable legal fees) arising from your misuse of the App, your violation of these Terms, or your violation of any law or the rights of a third party.
We may suspend or terminate your access to the App or Fastum Pro if you breach these Terms. You may stop using the App at any time by deleting it. Sections that by their nature should survive termination (including Sections 1, 7, 10–12, and 14) will survive.
These Terms are governed by the laws of the Province of Quebec and the federal laws of Canada applicable therein, without regard to conflict-of-laws rules, and you and we submit to the exclusive jurisdiction of the courts of the Province of Quebec. Before filing any claim, you agree to first contact us and attempt to resolve the dispute informally for at least 30 days. Nothing in these Terms limits any mandatory consumer-protection rights you have under the laws of your place of residence, which apply notwithstanding this section.
You represent that you are not located in a country subject to a comprehensive government embargo, and that you are not on any government restricted-party list. You agree to comply with all applicable export-control and sanctions laws.
We may update these Terms from time to time. We will revise the "Last updated" date, and material changes will be highlighted in the App or on this page. Your continued use after an update means you accept the revised Terms.
These Terms are the entire agreement between you and us regarding the App and supersede any prior agreements. If any provision is found unenforceable, the remaining provisions stay in effect. Our failure to enforce a provision is not a waiver. You may not assign these Terms; we may assign them in connection with a merger, acquisition, or sale of assets. Neither party is liable for delays or failures caused by events beyond its reasonable control.
This agreement is between you and us only, not with Apple. Apple is not responsible for the App or its content, maintenance, support, or any claims relating to it. Apple and its subsidiaries are third-party beneficiaries of these Terms and may enforce them against you.
support@yuramoskviak.com