Terms of Use

Effective 10 October 2026. Last updated 10 October 2026.

These Terms of Use ("Terms") are a legal agreement between you and RHH LLC ("RHH LLC", "StackDays", "we", "us" or "our"). They govern your use of the StackDays mobile app, the StackDays website, friends, challenges, team chat, subscriptions and related services (together, the "Service").

You accept these Terms when you create an account (the sign-in screen says "By continuing, you agree to our Terms of Use and Privacy Policy"), buy a subscription or otherwise use the Service. If you do not agree, do not use StackDays.

StackDays is developed and operated by RHH LLC. On Google Play it is published through a developer account held on behalf of RHH LLC. That account holder acts for RHH LLC, and every protection these Terms give RHH LLC and its personnel also covers them.

1. What StackDays is

StackDays provides digital tools for building habits: habit and streak tracking, goals and milestones, statistics, reminders, streak powers, vacation mode, friends, challenges with leaderboards and team chat, badges and, if you choose, syncing activity data from Apple Health or Health Connect.

StackDays is a motivation and tracking tool. It is not a medical device, a health or fitness advisory service, a personal trainer or a substitute for professional advice.

2. Who can use StackDays

You must be at least 18 years old, or the age of majority where you live, to create an account or buy a subscription. If you are at least 13 but below that age, you may use StackDays only with the permission and supervision of a parent or legal guardian, who agrees to these Terms for you and is responsible for your use, including purchases. StackDays is not for children under 13. You may not use the Service if the law forbids you to, including under applicable sanctions.

3. Your account

You need an account to use StackDays, which you can create with Apple, Google, Facebook or email and password. Give accurate information, keep your sign-in details and your phone secure, and tell us promptly if you think someone has accessed your account. You are responsible for activity under your account. Accounts are personal: do not sell, transfer or share yours.

4. Not medical or fitness advice

Everything in StackDays, including tips, milestones, suggested habits and challenge templates, is general information. Nothing in it is medical advice, a diagnosis, treatment, a training prescription or nutrition advice.

• Activity data synced from Apple Health or Health Connect comes from your devices and other apps. It may be incomplete, delayed or inaccurate, and StackDays uses it only to fill in the habits you link it to.
• Streaks, statistics and milestones are worked out from what you log. They describe your consistency, not your health or fitness.
• Reminders and notifications depend on your phone and may be delayed, silenced or missed. Do not rely on them for medication or other health deadlines.

5. Your training and your safety

Exercise and training carry risks that cannot be fully removed, including injury, overtraining, dehydration and, in rare cases, serious medical events. This is especially true for endurance goals such as running, cycling, swimming or triathlon training. You are responsible for:

• checking with a doctor before starting or intensifying a training plan, particularly if you have a medical condition, are pregnant or have not exercised in a while;
• choosing goals, distances and intensities that suit your health and fitness;
• training in a safe place, with suitable equipment, and following local laws;
• stopping and getting help if you feel pain, dizziness, chest discomfort, breathlessness or anything else that worries you.

A streak is never worth an injury. Streak powers and vacation mode exist so that you can rest without losing your progress.

6. Friends, challenges and team chat

Friends you connect with can see your display name, avatar colour and streak. Challenge members can see your progress within that challenge and the messages you send in its team chat.

There is zero tolerance for objectionable content or abusive behaviour. By posting in a challenge chat you agree not to send content that is harassing, threatening, hateful, sexually explicit, or that targets anyone on the basis of race, ethnicity, religion, gender, sexual orientation, disability or any similar characteristic.

StackDays filters messages containing slurs and similar terms when they are sent. You can report any message by holding it in the chat, which sends it to us for review and hides that person's messages from you, and you can block a member the same way. We review reports and remove offending content and eject abusive users, typically within 24 hours. To reach us about abuse, use Settings, Contact support, or email cristidumi96@gmail.com.

7. Free trial, subscriptions and payments

7.1 No free tier

StackDays can only be used with an active subscription or a lifetime purchase. There is no free tier and no free access without a plan. Accounts created before 10 October 2026 keep the 3 days of free access they were given at signup.

7.2 Plans and prices

StackDays is offered as auto-renewing monthly and yearly subscriptions and as a one-time lifetime purchase that never renews. The price, billing period and any introductory offer are shown in the app and in the App Store or Google Play before you confirm, in your local currency and including taxes as the store calculates them. The store's confirmation screen is the final word on what you pay.

7.3 The free trial

Monthly and yearly subscriptions start with a 3-day free trial offered through the App Store or Google Play. You get full access during the trial. Unless you cancel at least 24 hours before it ends, the subscription starts and you are charged the price shown. Eligibility is decided by Apple or Google, usually one trial per store account; if you are not eligible, the store charges you when you confirm. The lifetime purchase has no trial.

7.4 Automatic renewal

Payment is charged to your Apple ID or Google Play account when you confirm the purchase, or when an introductory free trial ends. Your subscription renews automatically for the same period and at the same price unless you turn off auto-renew at least 24 hours before the end of the current period. Your account is charged for renewal within the 24 hours before the current period ends. If the price changes, Apple or Google will tell you in advance under their rules, and you can cancel before the new price applies.

7.5 Cancelling

Cancel at any time in your store account: on iPhone in Settings, your name, Subscriptions; on Android in Google Play, Payments and subscriptions. Cancelling stops the next renewal; your access stays active until the end of the period you already paid for. Uninstalling the app or deleting your StackDays account does not cancel a subscription.

7.6 Refunds and withdrawal

Purchases are processed by Apple or Google, and refunds are handled by them under their policies. We cannot issue refunds for store purchases ourselves. If you live in the EEA or the UK, you have a 14-day right to withdraw from purchases of digital content; by starting a subscription you ask for access to begin immediately and acknowledge that this right ends once access has begun, except where the store's policy or the law gives you more. Nothing in these Terms limits refund or consumer rights that cannot legally be excluded.

7.7 Changes to what's included

We may change what StackDays includes. If a change materially reduces what you paid for during a period you have already paid, you may ask for a refund through the store, and mandatory consumer law applies.

8. Your content

You may add content such as habit names, notes, entries, your display name, challenge names and chat messages ("Your Content"). You keep ownership of Your Content. You confirm you have the rights needed to provide it and that it does not infringe anyone's rights or break the law.

To run the Service, you give RHH LLC a limited, non-exclusive, worldwide, royalty-free license to store, host, copy, transmit, process and display Your Content only as needed to provide, secure and maintain the features you use, including showing it to the friends and challenge members you share it with. The license ends when Your Content is deleted, subject to the limited periods described in the Privacy Policy.

9. Feedback

If you send us ideas or suggestions, we may use them freely without paying you or crediting you.

10. Our intellectual property and your license

StackDays and everything in it, including the software, text, the mascot, illustrations, icons, designs and branding, belongs to RHH LLC or its licensors and is protected by intellectual property laws.

Subject to these Terms, RHH LLC gives you a limited, personal, revocable, non-exclusive, non-transferable license to use StackDays for your own non-commercial purposes on devices you own or control. Except where the law expressly allows it, you may not copy substantial parts of StackDays, resell or redistribute its content, remove copyright notices, reverse engineer, decompile or disassemble the app, or create commercial products from it.

11. Acceptable use

You must not:

• use StackDays unlawfully, or to harass, threaten or harm anyone;
• access another person's account or data without permission;
• attempt to gain unauthorised access to our systems, probe for vulnerabilities without permission, or try to obtain our keys or credentials;
• interfere with, overload or disrupt the Service, or circumvent its limits or security;
• send automated or excessive requests, scrape content, or manipulate leaderboards, streaks or challenges;
• distribute malware, spam or unsolicited advertising through friends, challenges or chat.

We may limit, suspend or end access when reasonably necessary to deal with abuse, security threats, fraud or violations of these Terms.

12. Third-party services and platforms

StackDays relies on third-party services, including Google Firebase, Apple, Google, Meta, RevenueCat, Apple Health and Health Connect, as well as app stores, hosting providers and internet providers. Their services are subject to their own terms and privacy policies. To the maximum extent permitted by law, RHH LLC is not responsible for outages, errors, data loss, payment or subscription problems, security incidents or other failures caused mainly by systems outside our reasonable control, and such failures do not entitle you to compensation from RHH LLC.

13. Availability and changes to the Service

We work to keep StackDays running but cannot promise it will always be available or error free. We may add, change or remove features, change the design and change our subscription offers. Where a change affects mandatory rights for paid digital services, consumer law continues to apply.

Test versions. If you use a pre-release version of StackDays, for example through Apple TestFlight or a Google Play testing track, it is provided only for testing. It may contain more bugs, behave differently from the released app, lose data or stop working at any time, and it is provided without any warranty, to the maximum extent permitted by law.

14. Disclaimer of warranties

To the maximum extent permitted by law, StackDays is provided "as is" and "as available", without warranties of any kind, express or implied, including warranties of merchantability, fitness for a particular purpose, accuracy and non-infringement. We do not warrant that StackDays will always be available or error free, that streaks, statistics or synced data will be accurate, that it will meet your expectations, or that using it will produce any particular habit, health or fitness outcome. Some places do not allow these exclusions, so some of them may not apply to you; nothing here excludes warranties or statutory rights the law does not allow us to exclude.

15. Limitation of liability

Nothing in these Terms excludes or limits liability that cannot legally be excluded or limited, such as, where the law provides, liability for death or personal injury caused by negligence, for fraud, or for gross negligence or willful misconduct.

Subject to that, and to the maximum extent permitted by law:

• RHH LLC, its owners, members, managers, officers, employees, contractors, affiliates, licensors and service providers will not be liable for any indirect, incidental, special, consequential, exemplary or punitive damages, or for loss of profits, revenue, opportunity, data or use, arising from or relating to StackDays, however caused and on any legal theory, even if advised they were possible;
• RHH LLC is not responsible for, and will not compensate, injuries, losses or costs arising from exercise, training or other activities you track or plan with StackDays, including relying on StackDays instead of medical or professional advice;
• RHH LLC is not responsible for, and will not compensate, losses arising from software bugs or errors, outages, lost or incorrect streaks, statistics or entries, missed or late reminders and notifications, sync failures, hacking or other unauthorised access to data by third parties, or the failure of any third-party service StackDays relies on, except where caused by our gross negligence or willful misconduct;
• RHH LLC's total liability for all claims arising from or relating to StackDays is limited to the amount you paid for StackDays in the 6 months before the event giving rise to the claim, and is zero if you have not paid anything. More than one claim, incident or legal theory does not increase this limit.

These limits apply to claims in contract, warranty, negligence, tort, strict liability, statute or any other theory, and are an essential part of the bargain between you and us. If you are a consumer in the EEA or UK, we are liable for foreseeable loss caused by our breach of these Terms or our lack of reasonable care, and these limits apply only as far as your local law allows.

16. Indemnity

To the extent permitted by law, you agree to defend, indemnify and hold harmless RHH LLC and its owners, members, managers, officers, employees and contractors from third-party claims, losses and reasonable costs (including legal fees) arising from Your Content, your conduct towards other users, or your breach of these Terms or the law. This section does not apply where your local consumer law prohibits it.

17. No personal liability of owners and personnel

To the maximum extent permitted by law, any claim relating to StackDays must be brought against RHH LLC as the contracting party, and not personally against any owner, member, manager, officer, employee, developer, contractor, representative or store account holder of RHH LLC. None of them takes on personal liability to users because they developed, operated, published or maintained StackDays. This does not affect liability that the law does not allow to be excluded.

18. Time limit for claims

To the extent permitted by law, any claim relating to StackDays must be started within one year after it arose; otherwise it is permanently barred.

19. Security and suspension

We use reasonable measures to protect StackDays and its users, but no system is completely secure, and we cannot guarantee that data will never be lost, corrupted, accessed or disclosed without authorisation. If a security incident affects your personal information, we will tell you and the authorities where the law requires it.

We may temporarily suspend access where reasonably necessary because of security threats, suspected account compromise, unlawful activity, fraud, serious abuse or a material breach of these Terms.

20. Your records

StackDays is not a backup or record-keeping service. Your habits, entries, streaks and messages may be lost, become inaccurate or fail to sync because of bugs, outages, device problems, provider failures or attacks. Keep your own copy of anything important; Home lets you export a habit's month as a PDF.

21. Dispute resolution, arbitration and class action waiver

This section applies if you live in the United States. It does not apply to consumers living in the EEA, the UK, Switzerland or anywhere else where the law does not allow such an agreement to bind consumers; they may bring claims in their local courts and use their local consumer bodies.

21.1 Talk to us first

Before starting any claim, email cristidumi96@gmail.com with your name, your account email, a description of the problem and what you want. You and we agree to try in good faith to resolve it informally for 60 days.

21.2 Binding individual arbitration

If the dispute is not resolved, you and RHH LLC agree to resolve any dispute arising from or relating to StackDays or these Terms by final and binding individual arbitration, instead of in court, except as stated in 21.3. The Federal Arbitration Act governs this section. The arbitration will be administered by the American Arbitration Association (AAA) under its Consumer Arbitration Rules, before a single arbitrator. It may be held by video, phone or written submissions, or in person in the county where you live. Fees are paid as the AAA Consumer Arbitration Rules provide, which limit the consumer's share. The arbitrator decides questions of arbitrability and may award the same individual relief a court could, but only for you individually.

21.3 Exceptions

Either of us may bring an individual claim in small claims court if it qualifies, and either of us may ask a court for an injunction to stop infringement or misuse of intellectual property.

21.4 Class action and jury trial waiver

You and RHH LLC may bring claims against each other only individually, not as a plaintiff or class member in any class, collective, consolidated or representative action, and both waive any right to a jury trial. If this waiver is found unenforceable for a particular claim, that claim (and only that claim) will be decided in court, not in arbitration.

21.5 Opting out

You may opt out of this arbitration agreement within 30 days after you first accept these Terms by emailing cristidumi96@gmail.com with the subject "Arbitration opt out", your name and your account email. Opting out does not affect any other part of these Terms.

21.6 Changes

If we change this section, we will give you at least 30 days' notice, and the change will not apply to a dispute we already knew about.

22. Governing law and courts

These Terms are governed by the laws of the State in which RHH LLC is organized and by applicable United States federal law, without regard to conflict of law rules, except that the Federal Arbitration Act governs section 21. Any dispute not subject to arbitration will be heard in the state or federal courts serving the place where RHH LLC has its principal office, and you and we agree to their jurisdiction. If you are a consumer, this choice of law and courts does not take away the protection of mandatory laws of the place where you live, or your right to bring proceedings there where those laws give it to you.

23. Additional terms for the Apple App Store

If you got StackDays from the Apple App Store:

• These Terms are between you and RHH LLC only, not Apple. RHH LLC, not Apple, is solely responsible for StackDays and its content.
• Your license to use StackDays is limited to Apple-branded products you own or control, as permitted by the Usage Rules in the App Store Terms of Service. Apple's standard Licensed Application End User License Agreement also applies; where it conflicts with these Terms, these Terms prevail to the extent Apple allows.
• Apple has no obligation to provide maintenance or support for StackDays.
• If StackDays fails to conform to an applicable warranty, you may notify Apple, and Apple will refund the purchase price, if any. To the maximum extent permitted by law, Apple has no other warranty obligation for StackDays.
• RHH LLC, not Apple, is responsible for addressing any claims relating to StackDays or your use of it, including product liability claims, claims that it fails to meet legal or regulatory requirements, and consumer protection, privacy or similar claims, as well as any claim that StackDays infringes a third party's intellectual property rights.
• You confirm that you are not located in a country subject to a United States Government embargo or designated as a "terrorist supporting" country, and that you are not on any United States Government list of prohibited or restricted parties.
• Apple and its subsidiaries are third-party beneficiaries of these Terms and may enforce them against you.

24. Additional terms for Google Play

If you got StackDays from Google Play, the Google Play Terms of Service also apply to your purchase and download. Google is not responsible for StackDays or its content and has no obligation to support it.

25. Ending your use and deleting your account

You may stop using StackDays at any time and delete your account in the app (Settings, Delete account) or at stackdays-efb6b.web.app/delete-account.html. Deletion erases your account data as described in the Privacy Policy, but does not cancel an active Apple or Google subscription; cancel it in the store.

We may suspend or close an account where reasonably necessary for serious or repeated breaches of these Terms, fraud, illegal conduct, security threats or legal requirements. Where the law requires notice or a chance to challenge the decision, we will give it. Sections that by their nature should survive (including 4, 5, 8 to 10, and 14 to 22) survive termination.

26. Privacy

Our Privacy Policy explains how we handle personal information.

27. Mandatory consumer rights

Nothing in these Terms waives, excludes or restricts rights that cannot lawfully be waived under consumer protection or other applicable law. Where a provision conflicts with a mandatory legal protection, the protection applies.

28. General

• Severability: if a provision is held invalid or unenforceable, it will be limited to the minimum extent necessary and the rest of these Terms stays in effect, except as stated in 21.4.
• No waiver: not enforcing a provision immediately does not waive our right to enforce it later.
• Assignment: you may not transfer these Terms. We may transfer them as part of a merger, acquisition or sale of assets, or to an affiliate, without reducing your rights.
• Events beyond our control: we are not responsible for delays or failures caused by events beyond our reasonable control.
• Notices: we may send notices by email to your account address or in the app. You agree to receive communications electronically.
• Entire agreement: these Terms, the Privacy Policy and any terms shown when you buy a subscription are the entire agreement between you and RHH LLC about StackDays.
• Language: if these Terms are translated, the English version prevails to the extent permitted by law.

29. Changes to these Terms

We may update these Terms as StackDays changes. The date at the top shows the current version. For material changes we will give notice in the app or by email before they take effect. If you keep using StackDays after the effective date, you accept the updated Terms where the law allows; where it requires your express agreement, the changes apply only once you give it. Changes to section 21 follow 21.6.

30. Accessibility

We want StackDays to be usable by as many people as possible. It can follow your phone's light or dark setting, has its own theme and text size settings (Settings, Appearance), lets you turn haptics off, and labels its main controls for screen readers such as VoiceOver and TalkBack. Some parts, such as charts and the mascot, may not be fully accessible to everyone. If something is hard to use because of a disability, email cristidumi96@gmail.com and we will try to fix it or give you the information another way.

31. Contact

RHH LLC, operator of StackDays. Email: cristidumi96@gmail.com. Website: stackdays-efb6b.web.app.