Terms of use

Last updated: 30 September 2026 · Effective: 30 September 2026

Contents

1. About these terms
2. Who can use LeanFast
3. Health and safety
4. Your account
5. Free features and Prism
6. Subscriptions, trials and payments
7. Cancellation, refunds and withdrawal
8. Lens and nutrition information
9. Your content and data
10. Acceptable use
11. Our app and licence
12. Third-party services
13. Apple-specific terms
14. Availability and changes to the app
15. Ending the agreement
16. Warranties
17. Liability
18. Governing law and disputes
19. Changes to these terms
20. Contact and general

1. About these terms

These terms are an agreement between you and Anis Chebbi, 08022 Barcelona, Spain ("LeanFast", "we", "us"). They apply to the LeanFast iOS app, LeanFast Prism, and the website lean-fast.com (together, the "Service"). By using the Service, you agree to these terms. Our privacy policy explains how we handle personal data. It is not part of this contract, but please read it.

These terms apply in addition to Apple's Standard Licensed Application End User License Agreement ("Apple EULA"). If the two conflict, these terms apply to the extent the Apple EULA allows.

2. Who can use LeanFast

• You must be at least 18 years old.
• You must be able to enter into a binding contract where you live.
• You use the Service for personal, non-commercial purposes.

3. Health and safety

LeanFast is not a medical device and does not provide medical advice. Plans, body-stage information, coaching tips, grades and recipes are general wellness information. They don't diagnose, treat, cure or prevent any disease, and they don't replace advice from a doctor, dietitian or other qualified professional.

• Talk to a doctor first if you are pregnant, trying to conceive or breastfeeding. The same applies if you have diabetes, low blood pressure, heart, kidney or liver disease, a history of disordered eating or any other medical condition, take medication (especially for blood sugar or blood pressure), or are underweight.
• The safety check during onboarding limits or blocks fasting plans based on your answers. It only works if your answers are honest and up to date. Update them in Settings if your situation changes.
• Stop fasting and eat if you feel dizzy, faint, confused or unwell, or have palpitations. Fasts over 24 hours are for experienced adults only and need an extra acknowledgement in the app.
• In an emergency, call your local emergency number. LeanFast suggests one for the country you're in, but always check it and don't rely on the app.

Results differ from person to person. We don't promise any particular weight loss or health outcome, and goal dates in the app are estimates.

4. Your account

• You can use LeanFast without an account. An account adds backup and sync across devices.
• Sign-in uses a one-time email code, Google or Apple. There is no password. Keep access to that email address or sign-in provider secure, because anyone who controls it can sign in to your account.
• Give accurate information, and tell us if you think someone else has used your account.
• You can delete your account at any time in Settings › Delete account. Deleting your account doesn't cancel an Apple subscription. Cancel that separately (see section 7).

5. Free features and Prism

Free: personalised plans (Spark, Flow, Blaze), the weekly planner, the fasting timer and body stages, water and weight logging, widgets, Live Activities, Siri shortcuts, and a limited number of Lens scans.

LeanFast Prism (paid) adds unlimited Prism Lens, Prism Kitchen recipes, Prism Coach, Deep Insights, Streak Shields, custom fasts and more, as described in the app at the time you buy. Prism is for your personal use and is available to members of your Apple Family Sharing group where the purchase supports it.

6. Subscriptions, trials and payments

Prism is sold through the Apple App Store. Apple is the merchant of record: Apple takes the payment, charges applicable taxes, and handles billing and refunds under its own terms.

Prices in other countries follow the App Store's local pricing. The price shown in the app before you confirm is the price you pay.

• Payment is charged to your Apple ID when you confirm the purchase, or when a free trial ends.
• Auto-renewal: subscriptions renew automatically at the same length and current price unless you turn off auto-renew at least 24 hours before the end of the current period. Your Apple ID is charged for the renewal within the 24 hours before the period ends.
• Free trial: the yearly plan may start with a 7-day free trial, one per Apple ID. We remind you before it ends. If you don't cancel at least 24 hours before the trial ends, it converts into a paid yearly subscription. If you buy a subscription during a trial, any unused part of the trial ends.
• Price changes: if a subscription price goes up, Apple notifies you in advance, and where the law or Apple's rules require it, asks for your consent. If you don't agree, you can cancel before the new price applies.
• Offers: introductory or win-back offers apply only to the period stated in the offer. After that, the regular price applies.
• Restore: use Settings › Restore purchases with the same Apple ID to get Prism back on a new device.

7. Cancellation, refunds and withdrawal

• Cancel anytime: open iPhone Settings › your name › Subscriptions › LeanFast. Prism stays active until the end of the period you've paid for, and renewal stops.
• Refunds are handled by Apple. Request one at reportaproblem.apple.com. We can't issue refunds ourselves because we never receive your payment.
• EU and UK right of withdrawal: consumers in the EU and UK generally have 14 days to withdraw from a purchase of digital content or services. Apple handles withdrawal requests for App Store purchases through the link above. Where you asked for Prism to start immediately and acknowledged that this ends the withdrawal right once the content is supplied, the right may end early, as the law allows.

8. Lens and nutrition information

• Lens recognises meals, reads nutrition labels and looks up barcodes automatically. Recognition can be wrong, especially with poor lighting, blurry photos, damaged labels or unusual foods. Portions and values are estimates. When a reading looks uncertain, the app flags it so you can check and correct it.
• Never rely on Lens for allergies, intolerances or medical diets. Always read the product's packaging and ingredients.
• Fast-Friendly grades and advice are general guidance for fasting. They aren't a nutritional assessment of you.
• Some product data comes from Open Food Facts under the Open Database License. It is crowd-sourced and may be incomplete.

9. Your content and data

Everything you enter or create, including your logs, notes and photos, stays yours. If you use sync, you give us a limited permission to store, copy and transmit it only so we can back it up and show it on your devices. That permission ends when you delete the content or your account, apart from short-lived backups described in the privacy policy. We don't use your content to advertise to you, we don't sell it, and we don't use it to train AI models.

10. Acceptable use

Please don't:

• copy, modify, reverse-engineer or resell the app or its content, except where the law expressly allows it;
• get around paywalls, usage limits or security measures, or access other people's accounts or data;
• overload, probe or disrupt our systems, or use bots or scrapers against them;
• use the Service unlawfully, or to harm yourself or anyone else.

We may suspend accounts that seriously or repeatedly break these rules. Where reasonable, we'll warn you first.

11. Our app and licence

The app, its design, recipes, texts, graphics and software belong to us or our licensors. We give you a personal, non-exclusive, non-transferable, revocable licence to use the app on Apple devices that you own or control, as allowed by the Apple EULA and the App Store's usage rules. "LeanFast", "LeanFast Prism" and the LeanFast icon are our marks. Feedback and ideas you send us are welcome, and we may use them without owing you anything, but you keep ownership of your own words.

12. Third-party services

The Service relies on third parties, including Apple (App Store, Sign in with Apple, on-device intelligence), Google (optional sign-in), Supabase (accounts and sync), Resend (sign-in emails), Cloudflare (website) and Open Food Facts (product data). Their own terms and privacy policies apply to your use of their services. The privacy policy lists each one with a link. We aren't responsible for third-party services we don't control.

13. Apple-specific terms

If you downloaded LeanFast from the App Store:

• These terms are between you and us, not Apple. We, not Apple, are solely responsible for the app and its content.
• Your licence is limited to using the app on Apple-branded products you own or control, as allowed by the App Store's usage rules.
• We, not Apple, are responsible for maintenance and support. Apple has no obligation to provide any.
• If the app fails to meet any applicable warranty, you can notify Apple, and Apple may refund the purchase price of the app. To the extent the law allows, Apple has no other warranty obligation for the app.
• We, not Apple, are responsible for handling any claims relating to the app, including product-liability claims, claims that the app fails to meet legal or regulatory requirements, and consumer-protection or privacy claims.
• If a third party claims the app infringes their intellectual property, we, not Apple, are responsible for investigating, defending, settling and discharging that claim.
• You confirm that you are not located in a country subject to a US Government embargo or designated as a "terrorist supporting" country, and that you are not on any US Government list of prohibited or restricted parties.
• Apple and its subsidiaries are third-party beneficiaries of these terms and may enforce them against you.

14. Availability and changes to the app

We work to keep LeanFast reliable, but we can't promise it will always be available or error-free. Most features work offline. We keep improving the app and may add, change or remove features. If a change significantly reduces Prism features you've paid for, we'll tell you in advance. Where your local law gives you rights in that case, such as ending the contract or a price reduction, you keep them. We may stop offering the Service with reasonable notice. If we do, you'll still be able to export your data.

15. Ending the agreement

• You can stop at any time by deleting your account and the app. Remember to cancel any Apple subscription separately.
• We may end or suspend your access for a serious breach of these terms, or where the law requires it. If we end it without a fault on your part, we'll give reasonable notice. Where applicable law requires it, you'll get a pro-rata refund of any prepaid period.
• Sections that by their nature should continue after the agreement ends still apply, for example sections 9, 11, 16, 17 and 18.

16. Warranties

If you are a consumer in the EU or UK, you have statutory rights: digital content and services must be as described, fit for purpose and of satisfactory quality. These terms don't limit those rights.

Everywhere else, to the fullest extent the law allows, the Service is provided "as is" and "as available", without warranties of any kind, express or implied, including merchantability, fitness for a particular purpose and non-infringement.

17. Liability

If you are a consumer in the EU or UK: we are fully liable for damage caused intentionally or by gross negligence, for injury to life, body or health, under product-liability law, and wherever the law doesn't allow liability to be limited. For slight negligence, we are liable only if we breach an obligation essential to the contract that you normally rely on, and only up to the damage that is typical and foreseeable for this kind of contract. Otherwise we are not liable for slight negligence.

Everywhere else, to the fullest extent the law allows: we are not liable for indirect, incidental, special, consequential or punitive damages, or for lost data, profits or goodwill. Our total liability for all claims relating to the Service is limited to the greater of the amount you paid for Prism in the 12 months before the claim, or USD 50. Some jurisdictions don't allow these exclusions, so they may not apply to you.

Nothing in these terms excludes liability that can't be excluded by law.

18. Governing law and disputes

These terms are governed by the laws of Spain. If you are a consumer living in the EU, the UK or another country with mandatory consumer protections, you keep the protection of the mandatory laws of the country where you live. You can also bring claims in the courts there.

If something goes wrong, please contact us first at support@lean-fast.com. Most issues can be solved quickly that way. We are not obliged, and not willing, to take part in dispute-resolution proceedings before a consumer arbitration board.

19. Changes to these terms

We may update these terms, for example when we add features or when the law changes. We'll post the new version here with a new date. For material changes, we'll tell you in the app at least 30 days before they take effect. If you don't agree, you can stop using the Service and cancel your subscription before the changes apply. Changes never apply to a paid period you've already started, unless they are only in your favour or are required by law.

20. Contact and general

Anis Chebbi, 08022 Barcelona, Spain · support@lean-fast.com

If any part of these terms is found invalid, the rest stays in force. If we don't enforce a right straight away, we haven't given it up. You may not transfer your rights under these terms without our consent. We may transfer ours to a successor that takes over the Service, as long as your rights under these terms aren't reduced. These terms and the documents they refer to are the entire agreement between us about the Service.