Privacy Policy

This Privacy Policy explains how Calvo ("the app", "we", "us") handles information when you use our scientific calculator, unit converter, formula library, GPA/CGPA calculator, and AI math solver. Calvo is designed to run in your browser without requiring an account, and we do not operate any backend server that collects or stores your personal data.

1. Information We Collect

Calvo does not require registration and does not collect names, email addresses, or any other information that directly identifies you. We do use Google Analytics and Google AdSense, described in Section 2 below, which may use cookies or similar technologies to measure site usage and show ads.

The only data Calvo handles is stored locally in your browser (localStorage) and never transmitted to us:

• Theme preference — your chosen calculator theme/appearance.
• Calculation history — a record of your recent calculations, kept on your device.
• Saved results — results you choose to save within the app.
• AI Solver settings — your own Google Gemini API key (if you choose to use the AI Solver) and any questions or photos you save, stored only on your device.

This data stays in your browser and is never sent to Calvo's developers or any server we control. You can remove it at any time by clearing your browser's site data for Calvo.

2. Third-Party Services

Certain optional features in Calvo communicate directly with third-party services, from your browser to theirs, without passing through any server we operate:

• Google Analytics — we use Google Analytics to understand how many people visit Calvo and which pages or features they use, so we can improve the app. Google Analytics may use cookies or similar technologies and may collect information such as your approximate location, device/browser type, and pages visited. This information is processed by Google and is not linked to your name or email, since we never collect those. You can learn more, or opt out of Google Analytics tracking across all websites, via the Google Analytics Opt-out Browser Add-on.
• Google AdSense — we show ads through Google AdSense, which may use cookies to serve ads based on your visits to this and other sites. You can review or adjust your ad personalization settings at Google Ads Settings.
• AI Math Solver — uses your own Google Gemini API key, which you provide. Questions you type, and any photo you upload or capture to ask a question (including after cropping/rotating it), are sent directly from your browser to Google's Generative Language API. We do not receive, store, or have access to these questions or photos ourselves. This exchange is governed by Google's own terms and privacy practices, not by us.
• Voice Input — the microphone button on the AI Solver uses your browser's own built-in speech-recognition feature (the Web Speech API) to turn speech into text in the question box. Depending on your browser, this may send the audio to that browser vendor's own speech-recognition servers (for example, Google's, in Chrome) for transcription — it is never sent to us. If you'd rather not use this, simply type your question instead.
• Currency Converter — fetches public exchange rates from the free ExchangeRate-API service (open.er-api.com). No personal or identifying data is sent with this request.

We encourage you to review the privacy policies of these third-party services, as we have no control over how they process data sent to them.

3. How We Use Information

We do not collect personal data on any server we operate, and we never sell your information. Locally stored data (history, saved results, preferences) is used solely to make the app function the way you left it the last time you opened it. Google Analytics and Google AdSense operate independently, as described in Section 2, to help us understand app usage and show ads.

4. Data Security

Since your data stays on your own device, its security depends on your device and browser's own protections. We recommend keeping your browser up to date and not sharing your device or API keys with others.

5. Children's Privacy

Calvo is designed for students from 9th class through MS level, including users under the age of 18. Because we do not collect personal data from any user, we do not knowingly collect personal data from children either. If you are a parent or guardian with concerns, please contact us using the details below.

6. Your Rights and Choices

Since all Calvo-related data lives in your browser's local storage, you are always in control of it:

• Clear your browser's site data/cache for Calvo to delete all locally stored information instantly, including any saved questions or photos.
• Remove your Gemini API key at any time from the AI Solver tab to stop using that feature.
• Use the app without ever enabling the AI Solver or Currency Converter if you prefer not to contact any third-party service.

7. Changes to This Policy

We may update this Privacy Policy from time to time to reflect changes in the app or applicable law. Any changes will be posted on this page with a revised effective date above. Continued use of Calvo after changes are posted means you accept the updated policy.

8. Contact Us

If you have questions or concerns about this Privacy Policy, please reach out at usmaniftikhar2803@gmail.com.