Privacy & Cookies
Short version: the site works without cookies. We use privacy-friendly, cookieless analytics by default, and only load Google Analytics if you say yes. Your calculator inputs, builds and game scores live in your own browser.
Who we are
Tuning4U (tuning4u.info) is a free set of car-tuning calculators, guides and games. There are no accounts and no sign-up. This page explains what data is involved and the choices you have.
Analytics we use by default (no cookies)
To understand which tools are useful we count anonymous, aggregated events — page views, which calculator was used, a game finishing. This uses no cookies and stores no personal data:
- Our own counters — sent to our server and stored only as totals (e.g. "tire-size-calculator used 1,240 times"). Your IP address is used only momentarily to rate-limit abuse and is never stored.
- Vercel Web Analytics — a cookieless, privacy-focused measurement provided by our host.
Because this is anonymous and cookieless, it runs without a consent prompt under a legitimate-interest basis.
Google Analytics — only with your consent
If you click Accept on the cookie banner, we load Google Analytics 4 (measurement ID G-PL6VB4GQ5E) to see how the tools are used in more detail. This sets cookies in your browser and is governed by Google Consent Mode v2:
- By default, consent is denied — Google Analytics stores no cookies and receives only cookieless, anonymised signals (or nothing) until you accept.
- On Accept, analytics cookies are enabled. IP addresses are anonymised. We do not run advertising, so advertising and personalisation signals stay off.
- On Reject, Google Analytics stays in its cookieless state.
You can change your mind any time via Cookie settings (also in the footer). Data sent to Google Analytics is processed by Google; see the Google Privacy Policy.
Things kept in your browser (never sent to us)
Several features save data in your device's local storage. This stays on your device — we can't see it:
- My Build and your Garage of saved builds.
- Game bests for Tune It, Reaction Time and Drag Race.
- Your theme (dark/light), units (metric/imperial) and cookie choice.
- A random client id used only to keep one best entry per player on the leaderboards.
Calculator inputs shared via a link are encoded in the URL itself — not stored on any server. Clearing your browser data removes all of the above.
Leaderboards
If you submit a score to a game leaderboard, we store the display name you chose, the score, an optional note (e.g. the car), and the random client id — in our database (hosted by Supabase). Nothing else. Use a nickname if you'd rather not be identifiable. To have an entry removed, contact us below.
Cookies & storage at a glance
| Name | Type | Purpose | Set when |
|---|---|---|---|
| _ga, _ga_G-PL6VB4GQ5E | Cookie (Google) | Google Analytics measurement | Only after you Accept |
| t4u-consent | Local storage | Remembers your cookie choice | When you choose |
| t4u-theme, t4u-units | Local storage | Your theme & unit preferences | On use |
| t4u-build, t4u-garage | Local storage | My Build data | On use |
| t4u-rt, t4u-drag, tuneit2-* | Local storage | Your game bests | On use |
| t4u-uid, t4u-name | Local storage | Leaderboard identity | On use |
Processors we rely on
- Vercel — hosting and cookieless web analytics.
- Supabase — database for aggregate stats and leaderboards.
- Google Analytics — only if you consent.
Your choices & rights
- Accept or reject analytics cookies via the banner, and change it later under Cookie settings.
- Block or clear cookies and local storage in your browser at any time.
- Ask us to remove a leaderboard entry.
Contact
Questions, or want a leaderboard entry removed? Email privacy@tuning4u.info.