Calc Zest
  1. Home
  2. ›
  3. Privacy Policy
Privacy & Data

Privacy Policy

Last Updated: September 16, 2026 Your Privacy is Protected
No Data Stored
We never store your inputs
No Selling of Data
We never sell your information
Browser-Only Calc
All math stays on your device
No Sign-Up Required
Use everything anonymously
Table of Contents
Effective Date: September 16, 2026. This Privacy Policy explains how Calc Zest collects, uses and protects any information when you use our website and calculators.

1
Overview

At Calc Zest, your privacy is our top priority. This Privacy Policy describes how we handle information in connection with your use of our website at calczest.com (the "Site") and all associated calculator tools.

We have designed Calc Zest from the ground up with privacy in mind. Our core principle is simple: your financial data belongs to you, and it never leaves your device.

The short version: All calculator inputs and results are processed entirely in your browser using JavaScript. We do not transmit, store or have access to any numbers you enter into our calculators.

2
Information We Collect

We collect minimal information necessary to operate and improve the Site. Here is a clear breakdown of what we may collect:

Data Type What It Is Why Collected
Usage Data Pages visited, time on site, browser type, device type To understand how the Site is used and improve it
IP Address Your approximate location (country/city level) Security, fraud prevention and analytics
Referrer URL The page you came from before visiting Calc Zest To understand traffic sources
Contact Info Name and email (only if you contact us) To respond to your enquiry
We do NOT collect: your name, email address, financial details, salary, tax information or any other personal data unless you voluntarily contact us.

3
Calculator Data

This is the most important section for most users. When you use any calculator on Calc Zest — whether it's the RSU Tax Calculator, ESOP Calculator, Reverse Sales Tax or any other tool — the following applies:

  • All calculations are performed 100% in your browser using JavaScript.
  • No data you enter is ever sent to our servers or any third-party server.
  • No data you enter is ever stored in a database, log file or cookie.
  • When you close or refresh the page, all entered data is permanently gone.
  • We have no technical ability to see, access or retrieve any numbers you enter.
This architecture is intentional. We believe sensitive financial data should never leave your device, and we have built our tools accordingly. You can verify this by checking your browser's network tab — no calculation-related requests are ever made.

4
Cookies & Tracking

Calc Zest may use cookies and similar tracking technologies to enhance your experience and collect anonymous usage statistics. Here is what we use and why:

Cookie Type Purpose Can Be Disabled?
Essential Required for the Site to function correctly No (required)
Analytics Anonymous usage statistics (pages visited, time on site) Yes (via browser settings)
Preference Remember your settings (e.g. calculator inputs) Yes (via browser settings)

You can control and manage cookies through your browser settings. Please note that disabling certain cookies may affect the functionality of the Site. For more information on managing cookies, visit your browser's help documentation.

Analytics cookies collect only anonymous, aggregated data. We cannot identify individual users from this data. No financial inputs are ever included in analytics.

5
How We Use Information

The limited information we collect is used solely for the following purposes:

  • To operate, maintain and improve the Calc Zest website and calculators.
  • To understand how users interact with the Site so we can make it better.
  • To detect, prevent and address technical issues or security threats.
  • To respond to enquiries or support requests you send us directly.
  • To monitor aggregate usage trends and plan future calculator additions.
  • To comply with applicable legal obligations.

We will never use your information for targeted advertising, profiling or any purpose not listed above.

6
Sharing Information

We do not sell, trade or rent your personal information to any third party. Full stop.

We may share limited, anonymous, aggregated data in the following circumstances only:

  • Service providers: Trusted third parties who assist us in operating the Site (e.g. hosting, analytics), bound by strict confidentiality agreements.
  • Legal requirements: If required by law, court order or government authority, we may disclose information as legally required.
  • Business transfers: In the event of a merger, acquisition or sale of assets, user data may be transferred — you will be notified in advance.
  • Protection of rights: To protect the rights, property or safety of Calc Zest, our users or the public.
Remember: Since we never collect your financial calculator inputs in the first place, there is nothing of that nature to share with anyone.

7
Third-Party Services

Calc Zest uses the following third-party services to deliver the website. Each has its own privacy policy:

Service Purpose Data Shared
Google Fonts Typography (Inter font) IP address, browser info
Bootstrap CDN (jsDelivr) CSS/JS framework delivery IP address, browser info
Analytics Provider Anonymous site usage statistics Anonymous usage data only
Hosting Provider Website hosting and delivery Server logs (IP, pages visited)

We encourage you to review the privacy policies of these third-party services. We select service providers that meet high privacy standards and limit the data they receive to what is strictly necessary.

8
Data Security

We take reasonable and appropriate measures to protect the limited information we collect against unauthorized access, alteration, disclosure or destruction. These measures include:

  • HTTPS encryption for all data transmitted between your browser and our servers.
  • Regular security reviews of our website infrastructure.
  • Minimal data collection — the less we hold, the less there is to protect.
  • Access controls limiting who can access any site data we do hold.
No method of transmission over the internet or electronic storage is 100% secure. While we strive to protect your information, we cannot guarantee absolute security.

9
Your Rights

Depending on your location, you may have certain rights regarding any personal data we hold about you. These may include:

Right to Access
Request a copy of any personal data we hold about you.
Right to Deletion
Request deletion of any personal data we hold about you.
Right to Correction
Request correction of inaccurate personal data we hold.
Right to Portability
Request a portable copy of your data in a common format.
Right to Object
Object to processing of your personal data in certain circumstances.
Right to Withdraw
Withdraw consent for processing at any time where consent was given.

To exercise any of these rights, please contact us using the details in Section 12. We will respond to all legitimate requests within 30 days. Note that since we collect very little personal data, many of these rights may not be practically applicable to your use of Calc Zest.

10
Children's Privacy

Calc Zest is not directed at children under the age of 13 (or 16 in certain jurisdictions). We do not knowingly collect personal information from children.

If you are a parent or guardian and believe your child has provided personal information to us, please contact us immediately and we will take steps to delete such information from our records.

11
Policy Changes

We may update this Privacy Policy from time to time to reflect changes in our practices, technology or legal requirements. When we make changes, we will:

  • Update the "Last Updated" date at the top of this page.
  • Post the revised policy on this page with immediate effect.
  • For material changes, provide a more prominent notice on the Site.

We encourage you to review this Privacy Policy periodically to stay informed about how we protect your information. Your continued use of the Site after any changes constitutes acceptance of the updated policy.

12
Contact Us

If you have any questions, concerns or requests regarding this Privacy Policy or how we handle your data, please contact us. We take all privacy enquiries seriously and will respond promptly.

Privacy Questions or Requests?
We respond to all privacy enquiries within 2 business days.
Contact Us