Privacy Policy

1. What we collect — and what we don’t

We do not run Google Analytics, Facebook Pixel or any third-party tracker in the default build. We do not have a database, user accounts or a backend that sees your inputs. When you move a slider, the math runs in your browser via vanilla JavaScript; the only network request is loading the page itself (and, for the Historical Backtest’s daily closes, a single fetch to Yahoo Finance EOD at build time / via a GitHub Action at 16:00 IST).

2. Local storage & URL state

To remember your preferences without an account, we store two tiny keys in your browser’s localStorage:

• fc-theme — “light” or “dark” (so dark mode sticks).
• fc-currency — e.g. “INR” or “USD” (so ₹ vs $ sticks).

Every calculator also syncs its inputs to the URL’s query string (e.g. ?principal=10000&rate=8). That URL is the “share” feature — if you copy it, the recipient sees your exact sliders and chart because the numbers are in the link, not on a server. Clear the URL or hit Reset to wipe it. Clearing browser storage removes the two keys.

3. Cookies

We do not set tracking cookies. The only cookies that may appear are those set by your browser or by the host (e.g. Cloudflare) for security/DDOS protection — they are not used by us to identify you.

4. Third parties

• Fonts: Inter and JetBrains Mono are served from your own site via @fontsource, not Google Fonts CDN, so no font-tracking request.
• Charts: chart.js is bundled locally.
• Daily closes (Backtest page): EOD data is sourced from Yahoo Finance / NSE / BSE via a GitHub Action. It is public market data, not personal data. We cache it as daily-history.json and serve it statically.

If we ever add analytics, we will update this policy and show a banner before any non-essential storage.

5. Your rights

Because we store nothing server-side, there is nothing to export or delete on our end. You can:

• Clear localStorage in your browser’s dev tools or via “Reset”.
• Use the site in a private window — nothing will persist after you close it.
• Block localStorage entirely — the site will still work, it just won’t remember theme/currency.

For questions, contact us at privacy@financecalculators.example or via /contact.

6. Children

This site is for general financial education and is not directed at children under 13. We do not knowingly collect data from children.

7. Changes

We will update the “Last updated” date above when this policy changes. Material changes (e.g. adding analytics) will be noted in the FAQ and, if needed, with a banner.