Privacy

This page describes what DuelReflex does today. It is written to match the code, not to cover hypothetical future features. If that changes, this page changes with it.

There are no accounts

You cannot sign up and we never ask for a name, an email address or any other identifier. There is nothing to log in to.

What is stored on your device

Your results are kept in your browser's local storage, on your machine. That includes your best and average times per test and a random string used to tell one browsing session apart from another. The random string is not derived from anything about you and cannot be traced back to you.

Clearing your browser storage for this site deletes all of it permanently. We have no copy.

Cookies

DuelReflex sets no cookies. Local storage is not a cookie and is not sent with network requests.

Third-party analytics

There are none. No Google Analytics, no tag managers, no session recording, no third-party scripts of any kind. The usage events described below are recorded by us, on our own server, and are not shared.

Advertising

There is currently no advertising on this site. If display advertising is introduced later, this page will be updated before any ad code is served, and it will name the ad network and describe what it collects.

Results sent to our server

Aggregate statistics are what make comparison possible, so a completed result is submitted to build that distribution. A submitted result contains only:

• which test it was;
• the score, in milliseconds, and accuracy where relevant;
• the input used (touch, mouse, pen or keyboard, or several of them);
• a coarse country code derived from the connection;
• the time of submission.

No identifier accompanies a result. Submitted results cannot be linked back to a person, to a device, or to each other.

Usage events

We record a small set of events — a test being completed, a challenge being created or accepted, a card being shared — so we can tell whether the product is actually working. There are six of them and the list does not grow quietly.

These events carry the random string stored in your browser, which links your own events together so a session can be counted as one session. It is a pseudonymous identifier: it is not derived from anything about you and identifies nobody, but it does connect one event to another. Clearing your browser storage for this site issues a new one and breaks that link permanently.

Events carry no page addresses, no text you typed, and nothing about your device beyond which test was played.

Challenge links

A challenge link contains the settings needed to reproduce an identical run, and a shared result link contains your four axis scores. Both are readable by anyone who has the link — that is the point of them. Neither contains anything about you beyond those scores. Only share them if you want those numbers seen.

Hosting and logs

The site is hosted on Vercel, which keeps standard server logs (including IP addresses) for operational and abuse-prevention purposes as part of providing the hosting service. We do not use those logs to build profiles.

Children

DuelReflex is not directed at children and is not designed or marketed for them.

Your rights

Because nothing stored is tied to an identity, there is no account to access, export or delete. Data held on your device is under your control through your browser's settings. If you have a question about any of this, see the contact page.