Terms of Use

About us

These terms of use govern your access to and use of the digital products, services and website operated by Khairus.app (brand name "Khairus"), available at https://khairus.app. Throughout these terms, "we", "us" and "our" refer to Khairus.app; "you" and "your" refer to you, the user or customer.

By accessing our website, creating an account, or purchasing any product, you agree to be bound by these terms of use. If you do not agree, please do not use our service.

The service

Khairus offers digital products for immediate online access, including but not limited to:

• Online courses and learning paths ("trilhas");
• Templates, prompts and other downloadable materials;
• Mini web applications (installable progressive web apps) that provide tools, checklists, reading experiences and other interactive features.

When you purchase a product, you receive a personal, non-commercial, non-transferable, non-exclusive license to access and use that product for your own learning and personal benefit. Access is granted immediately upon successful payment confirmation, and you may begin using the product right away.

This is a license, not a sale: you do not acquire ownership of the content, code or materials. Your right is to access and use the product under the conditions set out in these terms.

Account and access

To access purchased products, you will create an account using your email address and a password, or sign in through a supported authentication provider. Your login credentials are personal and confidential. You are responsible for maintaining the security of your account and for any activity that occurs under it.

Do not share your login credentials or allow others to use your account. Each license is for individual use only. If we detect unauthorized sharing or access from multiple locations or devices in a manner that suggests account abuse, we reserve the right to suspend or terminate your access without refund.

If you believe your account has been compromised, contact us immediately at contato@khairus.app.

Purchases, prices and payments

All purchases are processed securely through Stripe, our payment service provider. We do not store or have access to your full credit or debit card numbers. Payment methods may include international credit and debit cards; for purchases in Brazilian reais (BRL), Pix may also be available as a payment option.

Prices are displayed in the currency shown on the product or checkout page and include any applicable taxes. If you are located in a jurisdiction where sales tax, VAT, or similar charges apply, these will be calculated and added at checkout when required by law.

Some products are offered as subscriptions with recurring billing (monthly, quarterly or annual, as specified at purchase). By subscribing, you authorize us to charge your payment method automatically at each renewal period until you cancel. You may cancel a subscription at any time from your account dashboard or by contacting us; cancellation will take effect at the end of the current billing period, and you will retain access until that date. No refunds are provided for partial billing periods after cancellation.

One-time purchases grant you ongoing access to the product under the license terms, with no recurring charge.

Refunds

For digital products purchased online, Brazilian consumer law grants you a 7-day right of withdrawal from the date of purchase (Brazilian Consumer Code, article 49). You may request a full refund within this period, no questions asked.

Certain products may offer a longer satisfaction guarantee period, clearly stated on the sales page at the time of purchase. If a longer guarantee is offered, that extended period will apply instead of the standard 7 days.

To request a refund within the applicable period, send an email to contato@khairus.app with your purchase details. Refunds will be processed to the original payment method within a reasonable timeframe.

After the guarantee period has expired, all sales are final and no refunds will be granted, except where required by applicable consumer protection law.

Availability and maintenance

Our service is provided "as is" and "as available". While we strive to ensure reliable access, we do not guarantee that the website, products, or any feature will be available at all times, without interruption, or free from errors.

Access may be temporarily unavailable due to:

• Scheduled or emergency maintenance and updates;
• Technical issues, server outages or software bugs;
• Failures, delays or outages affecting third-party service providers we rely on, including hosting infrastructure, content delivery networks, payment processors, and email delivery services;
• Circumstances beyond our reasonable control.

We are not liable for any losses, damages or inconvenience resulting from temporary unavailability of the service. We commit to working diligently to restore access within a reasonable time whenever disruptions occur, but cannot guarantee specific resolution timeframes.

If you experience persistent access issues, please contact us so we can investigate and assist.

Content updates and service evolution

Digital products are living resources. We continuously improve, update and evolve the content and features of our courses, mini apps, templates and other products to reflect new information, better practices, technical improvements, or changing legal and market conditions.

Content, lessons, modules, materials, tools and features may be updated, modified, replaced or removed at any time, at our sole discretion. This may happen to improve quality, correct errors, respond to user feedback, address technical or legal requirements, or adapt to new technologies.

When you purchase access to a product, you are purchasing access to that product as it is offered and as it evolves. We do not guarantee that any specific lesson, feature, tool or piece of content will remain available forever in its original form.

Where feasible, we will notify active users of significant changes that materially affect how a product works, but we are under no obligation to do so, and continued access to updated content is part of the service you receive.

Data stored on your device

Our mini web applications (progressive web apps) allow you to take notes, check off personal checklists, and track your progress through content such as reading steps or lessons. This personal data is stored exclusively on your own device, in your browser's local storage or the app's local data storage.

This means:

• The data never leaves your device. It is not transmitted to our servers, and we have no access to it.
• It does not sync between devices or browsers. If you use the app on a different device or browser, your notes and progress will not appear there.
• It is permanently lost if you clear your browser data, uninstall the app, reset your device, or switch to a new device.
• We cannot recover it. We have no backup of your local data and no technical means to retrieve it.

You are solely responsible for any data you create and store locally in our mini apps. We strongly recommend exporting or backing up important notes or information yourself if you want to keep it safe.

We accept no liability for loss of locally stored data under any circumstances, including device failure, user error, software bugs, or browser behavior.

Intellectual property

All content, materials, code, design, text, graphics, videos, software and other elements of our products and website are owned by or licensed to Khairus.app and are protected by Brazilian and international intellectual property laws.

Your purchase grants you a limited license to access and use the content for personal, non-commercial purposes only. You may not:

• Copy, reproduce, distribute, publish, display, or transmit any part of our content to third parties;
• Modify, adapt, reverse-engineer, decompile, or create derivative works;
• Remove or alter any copyright, trademark or other proprietary notices;
• Use our content to create competing products or services;
• Resell, sublicense, rent or transfer your access to anyone else.

If you wish to share or reference our materials publicly (for example, in a blog or presentation), please contact us for permission.

Acceptable use

You agree to use our service only for lawful purposes and in accordance with these terms. Prohibited activities include but are not limited to:

• Using the service to commit fraud, impersonate others, or engage in any illegal activity;
• Attempting to gain unauthorized access to our systems, other users' accounts, or any data not intended for you;
• Scraping, data mining, or using automated tools to extract content or data from our website or products;
• Reselling, redistributing or commercially exploiting access to our products;
• Uploading malicious code, viruses or anything that could harm our infrastructure or other users;
• Harassing, threatening or abusing our team or other users.

Violation of these rules may result in immediate suspension or termination of your access, without refund, and we may report illegal activity to the appropriate authorities.

AI-assisted content

We use artificial intelligence tools to assist in producing, personalizing and enhancing the content of our digital products. All AI-generated outputs are reviewed and curated by our human team before being included in any product.

Our content is provided for informational and educational purposes only. It does not constitute professional advice of any kind — including but not limited to financial, medical, legal, psychological, or career advice. You should not rely on our content as a substitute for advice from a qualified professional in any specialized field.

While we work to ensure quality and accuracy, we make no guarantees or warranties about the completeness, reliability, or suitability of any content or AI-generated suggestion for your particular situation. Results, outcomes and experiences will vary from person to person.

You are solely responsible for any decisions or actions you take based on our content.

Limitation of liability

To the maximum extent permitted by applicable law, Khairus.app and its owners, employees, partners and service providers will not be liable for:

• Any indirect, incidental, special, consequential or punitive damages;
• Loss of profits, revenue, data, opportunities or goodwill;
• Loss of data stored locally on your device (notes, progress, checklists in mini apps);
• Damages arising from service unavailability, interruptions, errors, or reliance on content;
• Failures or delays caused by third-party service providers (hosting, payment, delivery, CDN);
• Losses from unauthorized access to your account resulting from your failure to protect your credentials.

Our total aggregate liability to you for any and all claims arising from your use of our service will not exceed the total amount you paid to us in the 12 months immediately preceding the event that gave rise to the claim.

These limitations apply regardless of the legal theory (contract, tort, negligence, strict liability or otherwise) and even if we have been advised of the possibility of such damages.

Nothing in these terms limits or excludes liability that cannot be limited or excluded under Brazilian consumer protection law or other mandatory applicable law, including liability for death or personal injury caused by our negligence, fraud, or other rights that cannot be waived by contract.

Force majeure

We will not be held liable for any failure or delay in performing our obligations under these terms when such failure or delay is caused by events beyond our reasonable control, including but not limited to natural disasters, pandemics, wars, strikes, government actions, telecommunications failures, cyberattacks, or failures of essential third-party infrastructure.

Privacy

Your privacy matters to us. We collect and process personal data (such as your name, email, purchase history, usage data, IP address and device information) as necessary to provide the service, process payments, communicate with you, improve our products, and comply with legal obligations.

We use cookies and similar technologies for authentication, analytics (Google Analytics 4 via Google Tag Manager) and marketing measurement (Meta Pixel, Google Ads). Marketing cookies are only activated after you consent via the cookie banner displayed on your first visit; you may withdraw or change your preferences at any time.

Transactional emails (receipts, access details, password recovery) are sent automatically. Marketing emails are sent only with your consent, and you may unsubscribe at any time using the link provided in each message. Email delivery is handled by Resend.

For full details on how we collect, use, store and protect your information, and how to exercise your data rights under the Brazilian General Data Protection Law (LGPD) and equivalent international regulations, please read our Privacy Policy.

Changes to these terms

We may update or modify these terms of use at any time, to reflect changes in our service, legal requirements, or business practices. When we make changes, we will update the date at the top of this document and, for material changes, we will make a reasonable effort to notify you (for example, via email or a notice on the website).

Your continued use of the service after changes are posted constitutes your acceptance of the updated terms. We encourage you to review these terms periodically so you remain informed. If you do not agree to modified terms, you should stop using the service and may contact us to request account closure.

Governing law and contact

These terms of use are governed by and interpreted in accordance with the laws of the Federative Republic of Brazil, without regard to conflict of law principles. Any disputes arising from these terms or your use of our service will be subject to the exclusive jurisdiction of the Brazilian courts.

For any questions, concerns or requests regarding these terms, our service, refunds, or your account, please contact us at:

Email: contato@khairus.app

We will make reasonable efforts to respond to all inquiries promptly.