Privacy policy

Who is responsible for your data?

The data controller is the site’s publisher, ddx. For any question about your data: contact@calculusonline.fr.

The data we collect

• Your account: username, email address, password (stored hashed, never in plain text), sign-up date, profile photo if you add one, and preferences for input (keyboard or voice), division display and end-of-game tips.
• Your games: settings, questions asked, answers, response times, scores, rank, Elo and statistics.
• Your achievements: achievements and titles earned and progress counters, derived from your games, friends and guild.
• Your friends: requests sent and received, friendships, game invitations.
• Your guild: the guild you belong to, your role (leader or member), when you joined, invitations, crest, and the time of your last visit to the site (to show members whether you are online).
• Your feedback: the message sent from “Send feedback”, its type, the page it came from and, if you are not signed in, the email you choose to leave.
• Technical data: the IP address and browser linked to each sign-in, and your IP address to limit repeated attempts (abuse protection).
• Anti-cheating: in the daily challenge, your response times are analysed automatically. Times impossible for a human suspend the account from online play (daily challenge, lobbies, dungeons); a doubtful run is only reported to the site’s team. The report keeps the calculations, your answers and their times for as long as your account exists. You can contest a suspension through “Send feedback”: a person then reviews your case.

Without an account, you play as a guest: nothing is saved in solo games, except the daily calc, whose attempt (answers and times, no name) is kept for two days at most so you can save it to an account. Online, your guest name is saved with the game if other players have an account.

Theme, sound and some settings are kept in your browser (local storage) and are never sent to us.

Why, and on what legal basis

• Running the service (account, games, statistics, leaderboard, friends): performance of the terms of use (GDPR article 6.1.b).
• Securing the site (sessions, rate limiting, result checks): legitimate interest (GDPR article 6.1.f).
• Sending the emails your account needs (forgotten password): performance of the terms of use.

No advertising, no audience measurement, no resale: your data is only used to run Calculus.

What other players can see

• Your username, Elo, leaderboard position, number of games, win rate, achievements, title and daily calc score are public. Achievements unlocked by an online game are shown to the players of that game.
• Your profile photo is only visible to you, your friends and your guild members, who can also see whether you are online. A guild’s crest is visible to the signed-in players it invites.
• Results of an online game (usernames, scores, answers) are visible to anyone with the link to its report, which is shared with the game’s players.
• Your email address is never displayed. A player who already knows it can use it to send you a friend request.

Our service providers

Your data is processed by technical providers, only to run the site:

• Scalingo (hosting of the website, online games and database; French company, servers in France);
• Resend (email delivery, United States);
• voice input, if you turn it on: speech recognition is done by your browser, which may send the audio to its vendor (Google for Chrome, Apple for Safari, Microsoft for Edge). Calculus only receives the recognised number, never the audio.

Transfers to the United States are covered by the EU–US Data Privacy Framework or by the European Commission’s standard contractual clauses.

How long we keep it

• Account, games, statistics, friends and guild: as long as your account exists (the guild, until you leave it).
• Sign-in sessions (IP address, browser): 30 days at most.
• Password reset link: 1 hour. Game invitation: 10 minutes.
• Feedback: while we handle it, then deleted at most one year later. It stays readable by the site team, unlinked from your account if you delete it.

When you delete your account, everything is erased: account, sessions, statistics, Elo, friends and solo games. Online games remain for the other players, but your username is removed from them.

Cookies

Calculus only uses essential cookies: the one that keeps you signed in (30 days) and a session cache (5 minutes). No advertising or analytics cookies, which is why there is no banner to accept.

Children

Calculus may be used by children, and we ask for as little data as possible. If you are under 15, ask a parent before creating an account. A parent can write to contact@calculusonline.fr to have their child’s account deleted.

Your rights

You can at any time access your data, correct it, have it erased, get a copy, object to or restrict its processing, and give instructions about what happens to it after your death.

• Change your username: from your profile.
• Delete your account: “Delete my account” button in your profile.
• Any other request: write to contact@calculusonline.fr. We reply within one month.

If you believe your rights are not respected, you can lodge a complaint with the CNIL, the French data protection authority (cnil.fr).

This English translation is provided for convenience; the French version prevails.

Security

Traffic with the site is encrypted (HTTPS), passwords are hashed and database access is restricted.