Privacy

Last updated 24 August 2026 · Colla is pre-launch

The short version. If you join the waitlist we keep your email address, whatever you typed about where you train, and which ad brought you here. We use it once, to tell you when Colla opens near you. We do not sell it, and one email to us deletes it.

Who is responsible

Colla is an early-stage project, not yet an incorporated company. Until a European entity is registered, the person responsible for this data is the project’s founder, reachable at [email protected]. When the entity exists this page will name it.

What we collect, and only when you choose to give it

Your email address — because there is no other way to tell you when we open.
What you typed in “where and what you train” — free text, entirely optional. We use it to decide which neighbourhood to open next.
Whether you train, teach, both, or represent a brand — one of four buttons.
How you arrived — the campaign parameters in the link you clicked, plus the referring page. This tells us which advertisement worked. It is stored only for the duration of your visit and is sent along with your signup.

We do not ask for your name, your phone number, your location, or anything about your health or training history. The site reads your device location only if you press “Find me” while posting a session, and only to move the map — the position is never sent to us and never stored.

Where the map opens

So that the map opens on a city near you rather than on the whole continent, the page asks our server which country and approximate city your request came from. Vercel, which hosts the site, derives that from your IP address at the edge — the same address every website you visit receives. We do not ask the browser for your location, so no permission prompt appears, and we do not store, log or share the answer: it is used once, in your browser, to choose the starting view. Your timezone is the fallback if that fails. You can override the choice with the city buttons above the map.

Sessions on the public map

When you post a session you choose one of three things, and the wording sits next to the choice as you make it:

Only people I send the link to (the default) — the session is reachable only through its link. A dot appears on the public map at a coordinate rounded to roughly a hundred metres, carrying no title, no time, no name and no way to join. It exists so the map can show that a neighbourhood trains.
Anyone nearby — the session is listed on the map with its title, time, spot, turnout and rate, and strangers can add themselves until it is full.
Off the map entirely — nothing about the session is published anywhere.

You can move a session off the map at any time by cancelling it; it leaves the map immediately. Sessions and the people signed up to them are deleted automatically 60 days after they are created.

Where it goes

A signup is delivered as a message to a private Telegram chat used by the project, through a serverless function hosted by Vercel. Telegram receives the content of that message. Nothing is stored in a database on our side, and there is no mailing-list provider.

Cookies and measurement

The site sets no cookies of its own. If advertising measurement is switched on, a Meta (Facebook) pixel would set one — and it only loads after you press Allow on the banner. Choosing No thanks means nothing loads, and the site behaves identically. Your answer is remembered in your own browser and never sent anywhere.

Two third parties do see your IP address simply because the page fetches files from them: Google Fonts for typefaces, and OpenStreetMap and CARTO for map tiles. That is a technical consequence of loading an image or a font, not tracking, and we plan to self-host both.

How long we keep it

Until Colla opens in your city and we have written to you, or until you ask us to delete it — whichever comes first. If the project is abandoned, the list is deleted and we will say so publicly.

Your rights

Under the GDPR you can ask for a copy of what we hold, ask us to correct it, or ask us to erase it. Write to [email protected] and we will do it within thirty days — realistically the same day, since the list is small. You may also complain to your national data protection authority.

Changes

If this page changes materially before we launch, anyone already on the list gets told in the one email we send.