Barcelona: Tessera Audio Guide · Shahen Grigoryan IE · Effective 30 October 2026
Tessera has no accounts and no sign-in. Below is everything the app does with data, in full.
The app asks for your location while you use it, so it can show where you are on the map of the city and offer the story of the place you are standing next to.
Your GPS location never leaves your phone. It is not sent to us, not stored on any server, and not shared with anyone. It is not used for advertising or tracking.
Separately from that: like any internet service, our analytics provider sees the IP address of the request and derives an approximate location from it — roughly the country or region, not a place on a street. That is described under Analytics below.
Payment is handled entirely by Apple. We never see your name, your email or your card.
To know whether the guide has been purchased, the app uses RevenueCat, Inc. RevenueCat receives an anonymous identifier generated on your device and the purchase status that Apple reports. It is not linked to your identity. See the RevenueCat privacy policy.
Audio and photographs are downloaded from our server. Like any web server, it records the usual technical request data — IP address, time, and which file was requested — in short-lived logs kept by our hosting provider, Cloudflare. We do not build profiles from them and do not connect them to purchases.
Once the guide is downloaded, the app works with no network at all.
The app uses PostHog, with data stored in the European Union, to understand how it is used: how many people reach the introduction, start a route or finish a download, and where they give up. This tells us what to fix and what to write next.
PostHog receives an identifier generated for this installation, the device model, the operating system version, the app version, the language of the device, and an approximate location derived from the IP address of the request — the country or region, never a position on the map — together with the events listed below. It does not receive your name, your email or anything you typed.
Events also carry the random purchase identifier that RevenueCat assigns to this installation, the same one crash reports carry. It lets us see what happened before and after a purchase or a refund. It is not derived from you and does not contain your name, email or payment details.
The events are: opening the app, choosing a language, the welcome screens, playing the introduction, opening the purchase screen, completing a purchase, finishing a download, starting a route, opening a site, starting and ending navigation to a stop, and listening to a stop. No coordinates are ever sent — the identifier of a stop you listened to is not your location, and your position is never included; navigation events carry only distances and durations.
Sessions are recorded: PostHog receives periodic snapshots of the app’s screens and where they were tapped, so we can see where the app is confusing. The screens show only the guide itself — text, photographs and the map — and the app has no fields for typing anything personal.
See PostHog’s privacy policy. Deleting the app removes the installation identifier; a fresh install is counted as a new one and cannot be linked to the old.
No advertising. The advertising identifier (IDFA) is not collected: the app does not ask for it, and the analytics library does not read it. No cross-app or cross-site tracking. No selling or sharing of personal data. No accounts, so there is nothing to sign in to.
The app is not directed at children and collects no data that could identify anyone.
Photographs come from Wikimedia Commons under free licences (CC BY, CC BY-SA, CC0 or public domain). The author and licence are shown under each photograph inside the app.
Tessera is an independent app. It is not affiliated with, endorsed by or connected to the City of Barcelona, the Sagrada Família foundation, the owners of the Gaudí houses or any other site, museum or church described in the guide.
We hold no data that identifies you, so there is no account to access or close. If you want the analytics of your installation removed, write to us with the date and we will delete the corresponding data from PostHog. Deleting the app also stops any further collection immediately.
If this policy changes, the new version appears at this address with a new effective date.
Shahen Grigoryan IE, Armenia
tesseraguides@proton.me