SLStockLeo

Privacy Policy

Last updated: July 18, 2026

Overview

StockLeo is designed to be privacy-friendly. You can use every calculator without creating an account or providing personal identity information. This policy explains what limited data may be processed when you use the site. Please do not enter sensitive, confidential, or personally identifiable information into any calculator field.

Information we do not collect

  • We do not require you to register or log in.
  • We do not ask for your name, address, Social Security number, or account credentials.
  • Calculator math runs in your browser. We do not knowingly collect the values you type as identity data.

Calculator inputs and shareable URLs

Some calculator inputs may be stored in the page URL to support bookmarking and sharing. URLs may appear in browser history, shared links, server or CDN logs, referrer information, and analytics systems. Do not enter sensitive, confidential, or personally identifiable information into calculator fields.

Inputs included in a shareable URL may be visible to anyone who receives that URL. If you share a calculator link, the numbers you entered travel with it.

Technical data we may process

To operate and improve the site, our providers may process standard technical information, including:

  • Device and browser type, screen size, and general settings
  • Approximate location derived from your IP address
  • Pages visited and referring pages
  • Server and CDN request logs (which can include the requested URL)

This data is used to keep the site running, diagnose problems, and understand which calculators are useful. It is not used to build advertising profiles.

Analytics and hosting providers

The site is hosted on Vercel, so Vercel processes standard hosting and CDN request logs. The following measurement tools are currently active:

  • Google Analytics 4 — we send only pathname-based pageviews with IP anonymization enabled. Calculator query strings (which can hold your inputs) are never sent to Google Analytics, and we do not attach calculator inputs to analytics events.
  • Vercel Web Analytics — a privacy-friendly, cookieless measurement of page traffic based on route/pathname.

We do not currently run Microsoft Clarity or other session-recording or error-tracking tools. If that changes, this policy will be updated to name the provider. Uploaded CSV content from the Wash Sale tool is never recorded by analytics (see below).

Wash Sale tool: local-only processing

The Wash Sale CSV Checker parses your files entirely in your browser. Your trade data is not uploaded, stored, or transmitted to our servers, to Supabase, to analytics, or to any API. Refresh the page and the data is gone.

Optional saved calculations

A "Save Result" feature can store the inputs and results of a calculation you choose to save so it can be reloaded from a share link. This feature uses a Supabase database and is only active when the site operator has configured it; it is not currently enabledin production. Saved records do not contain personal identity information. Do not save sensitive personal data.

Cookies and local storage

StockLeo aims to minimize cookie use. Google Analytics may set measurement cookies; Vercel Web Analytics is cookieless. Any cookies are used for aggregate measurement, not advertising profiles. Some preferences may be stored in your browser's local storage on your device.

Data retention

Retention is governed by each provider. Google Analytics data retention follows the settings in the Google Analytics property; Vercel retains analytics and logs per its own policies. Review each provider's documentation for current retention periods.

Your choices

  • You can use a browser or extension that blocks analytics scripts, or enable "Do Not Track"/tracking protection.
  • You can clear your browser history and local storage to remove locally stored inputs and preferences.
  • You can avoid sharing calculator URLs that contain values you consider sensitive.

Third-party links

The site may link to third-party resources (including official IRS pages). We are not responsible for the privacy practices of other websites.

Contact

Questions about privacy? Email hello@stockleo.com or visit our contact page. StockLeo is an educational tool; calculator inputs should never include personal identifiers.