Privacy Policy

This Privacy Policy covers the Privacy Policy of the Contact Cache website (referred to as the website) as well as Contact Cache application (referred to as the application). Contact Cache refers to both the website and the application.

Who we are

Contact Cache was created by and it is operated by Petr Stříbný, a citizen of the Czech republic and Germany (referred to as “we” in this document and on the website). There is currently no legal business entity behind Contact Cache. Contact Cache will be incorporated in the future when we will start offering paid plans.

If you need to contact us in regard to the Privacy Policy, Terms of Service or in any other regard, use this email address:

Personal data collected and stored by the application

We collect your username, email address and hashed password when you create an account in the application. The username and email address can be anonymous and doesn’t have to reveal your identity. The email address serves as an emergency contact and to verify the account holder for certain actions. You can opt in to receive product updates on this email, see “Mailing list” section for information about processing your email address for marketing purposes.

Any other personal information that you enter into the Contact Cache application is either client-side encrypted or not stored on the server and thus unreadable to us.

Apart from data that you enter into the application, we also collect the date and time of your signup and your last login and various metadata necessary to provide the service, mainly date and times of creating or updating data in the application. We don’t store or associate your IP address with the account or its usage.

For the application, we log any access to any of our servers in an industry-standard way for security purposes which includes information such as a browser version, IP address and other metadata and keep this access log for a maximum duration of 7 days. In the case of an investigation of security incident we reserve the right to store the access log for a longer time, but only for so long as it is necessary for the investigation.

None of the personal data that we collect is shared with any third party.

You have the right to request the deletion of your account, in that case all your data will be deleted.

All personal data of the application are stored in Germany. Servers are provided by DigitalOcean, LLC.

How we keep your data secure

Almost all the data that you enter into the application are client-side encrypted, with the exception of your email address, your chosen username and password. By design your data are encrypted at rest in the browser or other local storage, at rest on the server and in transit over the internet. Data are encrypted with a key derived from your password. Your password is never stored or sent to the server, only its hash.

The website and the application are both served over secure https protocol. Any communication between the client and server side of the application is over secure https protocol.

We protect our servers using firewalls and other industry-standard practices and pay a lot of attention to security when developing the application.

You can read more about the technical details and how to further protect yourself on our Security page.

Website analytics

The website uses Google Analytics, a service which transmits website traffic data to Google servers. We use this data to monitor usage of the website. By using the website, you consent to the processing of data about you by Google in the manner described in Google’s Privacy Policy and for the purposes set out above. You can opt out of Google Analytics if you disable or refuse the cookie, disable JavaScript, or use the opt-out service provided by Google. We only collect anonymized data for the purpose of analyzing the website traffic.

The website is hosted by Webhosting s.r.o. in the Czech republic and we don’t manage the server, only the website itself.

Please note that Google Analytics, or any other third party analytics software IS NOT used inside the Contact Cache application


The website uses cookies for Google Analytics, see the documentation for its Cookie usage.

The application doesn’t use any cookies.

Mailing list

If you opted in to receive news and product updates on the Sign Up page or you subscribed to our newsletter in a special form on the website or elsewhere, your email address will be processed by MailerLite according to their Privacy Policy and used to send you occasional product updates. We will only send you emails relevant to Contact Cache and you can unsubscribe at any time following a link provided in every email.

Changes to this Privacy Policy

This policy is effective from 1.1.2019.