Privacy Policy

Last updated: October 9, 2026

1. Introduction

ToolStackStash (“we”, “us”, or “our”) operates toolstackstash.com. This Privacy Policy explains how we handle information when you use our free online calculators and tools.

2. Information We Collect

Calculator Inputs: Calculations happen in your browser using JavaScript. We do not store your calculator inputs (mortgage amounts, salary data, loan balances, etc.).

Optional AI Features: Some calculators offer optional AI-generated advice. When you click an AI button, the values shown in that calculator and any text you type are sent to our server and passed to a third-party AI provider (such as Groq, Google Gemini, Perplexity, or Anthropic) to generate a response. We do not store these requests. If you don’t want this information shared, don’t use the AI features.

Technical Information: We may collect basic technical information through standard web server logs:

IP address (anonymized)
Browser type and version
Pages visited and time spent
Referring website
Device type (desktop, mobile, tablet)

Analytics and Advertising Data: We use Google Analytics and Google AdSense, which collect information about your visit through cookies and similar technologies, as described in sections 4 and 5.

3. How We Use Your Information

We use collected information to:

Maintain and improve site functionality
Understand which calculators are most useful
Detect and prevent technical issues
Protect against malicious activity
Comply with legal obligations

We do NOT:

Sell your data to third parties
Create user profiles or share data with data brokers
Require email addresses or personal information to use our tools

Essential Cookies: We use minimal cookies necessary for site functionality (e.g., remembering your preferences).

Google Analytics: We use Google Analytics to understand how visitors use our site, such as which pages are visited, how long visitors stay, and how they arrived. Google Analytics uses cookies and collects information such as your IP address, device, browser, and pages viewed. You can opt out by installing the Google Analytics Opt-out Browser Add-on.

Google AdSense: Our site displays Google AdSense advertisements. Google and its partners use cookies to show ads based on your prior visits to this or other websites, and to measure ad performance. You can opt out of personalized advertising by visiting Google’s Ads Settings.

Cookie Consent (EEA, UK, and Switzerland): If you visit from the European Economic Area, the United Kingdom, or Switzerland, we ask for your consent before Google and its partners use cookies or similar technologies for personalized advertising and analytics. Consent is collected through Google’s certified consent management platform, which follows the IAB Transparency & Consent Framework. Until you make a choice, Google Consent Mode keeps advertising and analytics storage turned off, and Google may still show non-personalized ads.

Changing Your Choices: You can review or withdraw your consent at any time using the “Privacy & Cookie Settings” link in the footer of every page. You can also block or delete cookies through your browser settings, although some features may not work as intended.

5. Third-Party Services

Google AdSense and Google Analytics: We use Google AdSense to display advertisements and Google Analytics to measure site usage. Google’s use of advertising cookies enables it to serve ads based on your visit to our site and other sites on the Internet. Learn how Google uses data from sites that use its services: https://policies.google.com/technologies/partner-sites. Google’s Privacy Policy: https://policies.google.com/privacy

AI Providers: If you use an optional AI feature, your request is processed by a third-party AI provider under that provider’s own privacy policy.

Hosting Provider: Our site is hosted by a third-party hosting provider. They may collect standard server logs but do not have access to your calculator inputs.

Google reCAPTCHA: Our contact form is protected by Google reCAPTCHA v3 to block spam and abuse. reCAPTCHA collects hardware and software information (such as device and application data) and sends it to Google for analysis. Its use is subject to the Google Privacy Policy and Terms of Service. Messages you send through the contact form (your name, email address, and message) are emailed to us so we can reply, and are not shared with third parties.

6. Data Security

We implement reasonable security measures to protect information. However, no internet transmission is 100% secure. Calculations happen in your browser, and we do not store calculator inputs.

7. Your Rights

You have the right to:

Access any personal information we hold (though we collect minimal data)
Request deletion of your information
Opt out of cookies (may affect site functionality)
File a complaint with data protection authorities

To exercise these rights, contact us at our contact form.

8. Children’s Privacy

Our site is not directed to children under 13. We do not knowingly collect information from children. If you believe a child has provided us with personal information, contact us immediately.

9. International Users

If you access our site from outside the United States, your information may be transferred to and processed in the United States. By using our site, you consent to this transfer.

10. Changes to This Policy

We may update this Privacy Policy occasionally. Changes will be posted on this page with an updated “Last updated” date. Continued use of our site after changes constitutes acceptance of the new policy.

11. California Privacy Rights (CCPA)

California residents have additional rights under the California Consumer Privacy Act:

Right to know what personal information is collected
Right to know if personal information is sold or disclosed
Right to opt out of sale of personal information (we don’t sell data)
Right to deletion of personal information
Right to non-discrimination for exercising privacy rights

12. Contact Us

Questions about this Privacy Policy or our data practices?

Contact: use our contact form.

We typically respond within 24-48 hours.