Privacy policy

What 9Darts stores, what leaves your phone and what does not, and who to ask about it.

Last updated: 30 October 2026

Who is responsible

9Darts, Slovakia. For anything on this page, write to richardkollar@tutanota.com.

What is stored on your phone

Your settings, the game in progress and up to two hundred finished games are kept in your browser’s local storage. That is storage on your own device, not a server, and it is what makes the app work offline. Nobody else can read it. Clearing your browser data for this site, or resetting the app, deletes all of it, permanently.

This storage is strictly necessary for a feature you asked for by using the app, so it needs no consent. It is not used to track you and, unless you claim a name, holds no identifier — a claim keeps the key to that name on your phone, and nothing else.

Cookies

Only if you allow usage statistics. This site sets no cookies of its own, and the pages outside the app run no JavaScript at all. The app asks once whether it may count its visits with Google Analytics; if you say yes, Google sets two cookies, described under Usage statistics below, and taking the yes back in Settings deletes them. Say no, and nothing sets a cookie on your phone.

That is changing, and this page is saying so before it does rather than after — which is what the previous version of this page promised. The app is going to start showing ads served by Google AdSense. When it does, Google will set cookies and read them in order to serve, cap and measure those ads, and in the European Economic Area, the UK and Switzerland you will be asked to agree first, through Google’s own consent message. If you say no, you will still see ads; they will be non-personalised ones, chosen from the page rather than from anything about you.

One other exception, and it is not this site: if somebody gives you a private link to their own copy, that link sets a single cookie so the pages you open carry the key. It says nothing about you and is strictly necessary for getting in at all.

What leaves your phone

Six things. Three of them are things you choose to do.

• Playing a mate online: that game’s darts, the two names typed in and a four-letter room code go to the server so the other phone can read them. The room is deleted thirty minutes after the last phone stops asking about it. Nothing about it is kept afterwards.
• Claiming a name: the name goes to the server, which keeps it with the day it was claimed, the day it was last used online, and a hash of the key your phone made for it — never the key itself — so that no two people duel under one name. There is no email and no password: it is not an account. A duel from that phone then carries the key as well, so the server can tell it is you.
• Usage statistics, if you allow them: which screens of the app are opened, and when a game starts or finishes, go to Google Analytics, as the Usage statistics section below describes. Never a dart, a score or a name.
• Ordinary web requests: like any website, the server sees your IP address and the kind of browser you are using in order to answer at all.
• When the app hits an error: the error’s own message, where in the code it happened, which screen you were on and the app’s version go to the server’s logs, so the bug can be fixed. Never a dart, a score, a name or a room’s code.
• Once ads are switched on: a request to Google, who serve them. That happens whether or not you agree to personalised ads — saying no gets you non-personalised ones, not none — and the Ads section below says exactly what it means.

Google is therefore the only other party that will ever receive anything: for ads, and for usage statistics if you allow them. Nobody else does — there is no other analytics provider, no error reporting service, no marketing tool, and nothing is sold or shared for anyone else to use.

The caller, when you turn it on, speaks with a voice that lives on your phone — the app will use no other kind — so nothing it says is sent anywhere either.

On the first screen, at the foot of Settings and of Statistics, and at the foot of these pages, there is a link to Ko-fi, where you can leave a tip. It is only a link: nothing goes to Ko-fi unless you tap it, and what you do there is between you and Ko-fi, under its own privacy policy.

Ads

The app shows ads. Today every one of them is part of the app itself: drawn from text already on your phone, working with the radio off, loading nothing, requesting nothing and tracking nothing.

Google AdSense is being added alongside them, and this section describes it in advance. When it is switched on, the app will load Google’s script and Google will receive what any ad network receives in order to serve an ad: your IP address, the page you are on, your browser and device, and — if you agree to it — identifiers that let ads be personalised and measured across sites. Google is an independent controller of that data and its own privacy policy governs it.

Consent is handled by Google’s own certified message, which is what appears the first time you open the app in the European Economic Area, the UK or Switzerland. You can change your answer there at any time. Saying no does not cost you anything in the app: the ads simply stop being personalised.

• Ads never appear on the game screen. Not now and not after this change — there is no room on it and the middle of a leg is not a place for a CTA. They sit at the end of the setup, summary and statistics screens.
• Nothing you type in the app, a player’s name included, is ever sent to Google.

How Google uses data from sites that use its services

Google’s own ad settings, where personalisation can be turned off

Usage statistics

The first screen asks once whether the app may count its visits with Google Analytics, with both answers side by side and the same size. Nothing is loaded or sent before you answer, and nothing ever after a no. If you allow it, the app loads Google’s script, and Google receives what any analytics service receives: your IP address, your browser and device, your language and rough location, and which screens you open — each named by the screen, never by what is on it. It also learns when a game starts or finishes, with its mode, the number of players and the bot’s level, and when an online game is opened or joined. Never a dart, a score, a name or a room’s code.

• Two cookies, _ga and one whose name starts _ga_, tell one visit from the next. They are set only after a yes.
• Google signals and the advertising features are off: the statistics are not joined to a Google account and are not used for ads.
• Google keeps them for two months, as this site’s processor under its data processing terms. The legal basis is your consent.
• You can take it back at any time with the Usage statistics switch in Settings: the counting stops and both cookies are deleted.

How long things are kept

• Games and settings: on your phone until you delete them.
• Duel rooms: thirty minutes after the last request.
• A claimed name: until you release it in Settings, or twelve months after it was last used online.
• Usage statistics: two months at Google Analytics; its cookies on your phone for up to two years, or until you take the yes back.
• Server logs: short-term, for keeping the thing running and secure.

Your rights

Under the GDPR you may ask what is held about you, ask for it to be corrected or deleted, and object to how it is used. Since almost everything is on your own phone, most of that you can do yourself in Settings — including exporting your games as a file, and releasing a claimed name, which erases it. For the rest, write to the address above.

If you think this has been handled badly you may complain to the Slovak Data Protection Authority (Úrad na ochranu osobných údajov Slovenskej republiky).

Children

This is a dart scorer, not a social network. It is not directed at children, asks nobody for personal details, and shares nothing with anybody beyond what this page describes.