Cookie & Storage Policy
OJ Services
Last updated: March 2026
1. Overview
This application is designed as a professional tool for plumbing and heating estimation. It does not use third-party cookies, advertising trackers, or analytics services. This page explains what browser storage technologies the application uses and why.
2. What We Use
| Technology | Purpose | Data Stored |
|---|---|---|
| Service Worker | Enables the app to load when offline and caches static assets for faster performance | Application code, stylesheets, fonts — no personal data |
| IndexedDB | Offline queue for API requests made while the device has no internet connection | Pending API requests (e.g. saving an estimate while offline). Cleared once synced. |
| Session cookies | Standard Next.js framework cookies for page routing | No personal data — technical session identifiers only |
3. What We Do Not Use
- No third-party cookies — we do not embed Google Analytics, Facebook Pixel, or any tracking service
- No advertising cookies — this is a professional tool, not a consumer website
- No cross-site tracking — no data is shared with or collected by external domains
- No fingerprinting — we do not collect device or browser fingerprint data
4. Data Storage Location
All business data (customers, estimates, invoices, etc.) is stored server-side in JSON files on the application server. The browser stores only the minimal data listed in section 2 above, which is needed for the application to function correctly.
5. Managing Browser Storage
You can clear all browser storage used by this application at any time:
- Chrome/Edge: Settings > Privacy > Clear browsing data > Cookies and site data
- Firefox: Settings > Privacy > Cookies and Site Data > Manage Data
- Clearing browser storage will not affect your saved data (estimates, customers, etc.) as this is stored on the server.
6. Contact
If you have any questions about this policy, contact us at Ollie@OJServices.co.uk. See our Privacy Policy for full details on how we handle personal data.