Privacy Policy
Last updated 9 August 2026
This policy explains what personal data Blepper collects, why, who else processes it, and the rights you have. It covers the Blepper mobile app and this website. Blepper is being built for the Netherlands and is designed around a simple idea: the app should know as little about you and about where you go as possible.
Who we are
The data controller is Marked Labs B.V., registered with the Dutch Chamber of Commerce (KvK) under number 66657830. Our registered address can be looked up through the public KvK register using that number.
For any privacy question or to exercise your rights, contact privacy@blepper.app.
Privacy by design
- A sighting never stores where you were. When you save a sighting, your device works out roughly where you are. Before anything is saved, that position is reduced to an approximate area of about 100 metres across. We store only that approximate area and the name of the neighbourhood — never your precise coordinates, and we never write them to our logs.
- Photos are stripped of hidden metadata. When you upload a photo, we re-process it on our server to remove embedded information such as GPS location before it is stored.
- A cat never shows an address. To anyone but you, a cat shows a neighbourhood, a number of sightings and the most recent month — never a map, never an area, never a sighting-by-sighting history.
- No tracking. This website uses no cookies, no analytics, and no third-party trackers. The app shows no advertising and contains no advertising identifiers.
What other people can see
Blepper is shared. A cat is one record that everybody who meets it contributes to, so some of what you add is visible to other people. This is the part worth reading twice.
- Your display name is public. It appears on a national leaderboard that ranks what people contribute. You choose the name yourself, and we never derive it from your email address.
- Your photos, ratings and tags appear on the cat's page. Anyone signed in can open a cat and see them. Your name is attached to what you contributed.
- Where you were is not. The approximate area of your sightings, and any exact location you record for a cat in your care, are yours. Nobody else sees either one.
What we collect and why
| Data | Why we need it | Legal basis | Kept for |
|---|---|---|---|
| Email address | To create your account and send your sign-in link | Performance of a contract | Until you delete your account |
| Sign-in session | To keep you signed in | Performance of a contract | Expires after 30 days |
| Age confirmation (16-or-over) | To record that you passed the age check | Legal obligation | Until you delete your account |
| Photos of cats | They are the point of the app | Performance of a contract | Until you delete them or your account |
| Approximate area (about 100 m) | To tag a sighting to a neighbourhood | Performance of a contract | Until you delete the sighting or your account |
| Neighbourhood name | To show where a sighting was | Performance of a contract | Until you delete the sighting or your account |
| Cat details you enter | Names and appearance on the shared record of a cat, which other people also see | Performance of a contract | Until you delete them or your account |
| Crash diagnostics | To find and fix problems that make the app fail | Legitimate interest | About 90 days |
One exception on location, and only one. If a cat is in your care, you may record where it lives. That is your own address to give, so we store it as you entered it. It is never shown to another person, never added to any total, and it is deleted with your account.
What we deliberately do not collect: where you were when you saved a sighting, your date of birth (only a yes/no answer to being 16 or over), device identifiers, your contacts, background location, or any advertising identifier.
A note on the cats you photograph
Repeatedly photographing the same outdoor cat in the same place could, in theory, point to where that cat's owner lives. The approximate-area design above exists specifically to prevent that. Please also be considerate: avoid photographing people, house numbers, or licence plates where you can, and only photograph cats in places you are allowed to be.
Who else processes your data
We use a small number of service providers to run Blepper. Each acts on our instructions under a data processing agreement, and each receives only what it needs.
| Provider | What they do | Where |
|---|---|---|
| Hetzner Online GmbH | Hosts the app's servers and stores all data at rest | Germany |
| Turns an approximate area into a neighbourhood name. It receives only the approximate area, never your location. | United States | |
| Resend | Delivers your sign-in emails. It receives your email address. | United States (email sent from the EU) |
| Sentry | Collects crash diagnostics so we can fix failures. Configured to receive no location data. | EU data region |
Where a provider is based outside the European Economic Area, transfers are covered by appropriate safeguards such as the European Commission's Standard Contractual Clauses.
Your rights
Under the GDPR you have the right to:
- access the personal data we hold about you, and receive a copy;
- have inaccurate data corrected;
- have your data erased;
- receive your data in a portable format;
- restrict or object to certain processing;
- lodge a complaint with a supervisory authority.
You can export or permanently delete all of your data from inside the app, at any time. You can also email privacy@blepper.app and we will help. If you believe we have handled your data improperly, you may complain to the Dutch Data Protection Authority (Autoriteit Persoonsgegevens).
Age
Blepper is for people aged 16 and over, in line with the Netherlands' age of digital consent. We ask you to confirm your age when you first use the app, and we store only that confirmation.
Changes to this policy
If we change how we handle data, we will update this page and the date at the top. Significant changes will be highlighted in the app.
Contact
Marked Labs B.V. — privacy@blepper.app.