Your data, on your terms.

1. Overview

ExcelFormulas ("we", "us", or "our") operates the ExcelFormulas website and its tools. This privacy policy explains what information we collect when you visit our site or use our tools, why we collect it, and how you can exercise control over it. We designed the site to work in your browser with as little data collection as possible.

2. Information we collect

We collect very little personal information. In summary:

• Usage data. Standard, non-identifying analytics such as pages visited, time on site, and browser type, used to improve the site.
• Cookies and local storage. Preferences such as dark mode and Student Mode are stored in your browser's local storage so your choices persist between visits.
• Contact submissions. If you contact us through the contact page, we receive the name, email address, and message you submit so we can respond.

3. How we use your information

• To provide, operate, and maintain the tools on this site.
• To remember your preferences (theme, Student Mode) on your own device.
• To respond to your questions and support requests.
• To understand aggregate usage patterns and improve the product.

4. No account, no tracking of your data

ExcelFormulas requires no account and no sign-up. Formulas you generate or edit inside the sandbox are computed in your browser and are not uploaded or stored on our servers. We do not sell, rent, or trade your personal information to third parties.

5. Cookies

We use cookies and similar technologies to remember preferences and to understand how the site is used. You can disable cookies in your browser settings; the core tools will still work, though some saved preferences may reset.

6. Advertising and Google AdSense

We may display advertisements provided by Google AdSense and other third-party ad networks to help fund and maintain free access to our educational tools. In connection with these services:

• Third-party vendors, including Google, use cookies and similar technologies to serve ads based on a user's prior visits to our website or other websites on the internet.
• Google's use of advertising cookies enables it and its partners to serve personalized or contextual ads to users based on their visits to our site and other destinations across the web.
• Users can opt out of personalized advertising at any time by visiting Google Ads Settings.
• Alternatively, users can opt out of third-party vendor cookies for personalized advertising by visiting the Network Advertising Initiative opt-out page at www.aboutads.info.

7. Third-party services

Our site may use third-party services (such as hosting and analytics providers) that process data on our behalf. These providers are bound to handle your information only as necessary to provide their service to us and in accordance with this policy.

8. Data security

We take reasonable technical and organizational measures to protect the limited information we hold against loss, misuse, and unauthorized access. Because the tools run largely in your browser, very little data ever reaches our servers in the first place.

9. Children's privacy

Our site is a general educational resource and is not directed at children under the age of 13. We do not knowingly collect personal information from children. If you believe a child has provided us with personal information, contact us and we will remove it.

10. Your choices and rights

Depending on your location, you may have the right to access, correct, delete, or restrict the processing of your personal information. To exercise any of these rights, contact us using the details on the contact page.

11. Changes to this policy

We may update this privacy policy from time to time. When we do, we will revise the "last updated" date at the top of this page. Material changes will be noted on the site. Continued use of the site after changes means you accept the updated policy.

12. Contact us

Questions about this privacy policy can be directed to us through the contact page.