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Cookie and Similar Technologies Policy

Version: 1.0

Effective date: July 12, 2026

1. General provisions

This Cookie and Similar Technologies Policy applies to olegzemtsov.com, including its Russian and English versions.

The website owner and data controller is Oleg Zemtsov.

Contact for questions concerning cookies and data processing:

oleg9175495330@gmail.com

This Policy explains:

  • which technologies are used on the website;
  • why they are used;
  • which third-party analytics services may be enabled;
  • how a visitor can allow or reject analytics;
  • how a visitor can change a previous decision.

Additional information about the processing of personal data will be provided in the Privacy Policy.

2. What cookies and similar technologies are

Cookies are small text files stored in a visitor’s browser by a website or a service connected to that website.

They may be used to:

  • remember visitor preferences;
  • recognise a browser or device;
  • distinguish visits and sessions;
  • analyse website traffic;
  • analyse how visitors interact with website pages.

The website and third-party services may also use similar technologies, including:

  • localStorage;
  • sessionStorage;
  • browser identifiers;
  • analytics tags;
  • pixels;
  • other methods of locally storing or transmitting technical information.

In this Policy, the term “cookies” may be used in a general sense and may include these similar technologies.

3. Categories of technologies

The website uses two categories of technologies:

  1. necessary technologies;
  2. analytics technologies.

The website does not provide individual selection of separate analytics providers. A visitor may either allow all connected analytics services or reject all optional analytics technologies.

4. Necessary technologies

Necessary technologies support the website’s basic functionality and remember preferences explicitly selected by the visitor.

They may be used to:

  • remember the selected light or dark theme;
  • remember the visitor’s analytics decision;
  • store the version and date of that decision;
  • ensure the proper and secure operation of the website.

The analytics decision is stored locally in the visitor’s browser, for example through localStorage.

Necessary technologies are not used for advertising, remarketing or creating a marketing profile of the visitor.

They cannot be disabled through the cookie settings window. A visitor may remove the stored data through their browser settings. If the data is removed, the website may ask the visitor to select their settings again.

Technical web server and hosting logs are not cookies. They may be created independently of the selected cookie settings in order to deliver website pages, protect the website and diagnose technical errors. Such processing is described in more detail in the Privacy Policy.

5. Analytics technologies

Analytics technologies are used only after the visitor has given explicit consent.

After the visitor selects “Allow analytics”, the website may enable:

  • Google Analytics 4;
  • Yandex Metrica;
  • Microsoft Clarity.

These services are used for a common purpose: analysing website traffic, understanding how visitors interact with the website, identifying technical or usability problems and improving the website.

Before consent is given, the scripts of these services must not be loaded and the website must not intentionally send analytics data to them.

When the visitor selects “Necessary only”, none of the listed analytics services is enabled.

Continuing to browse the website, scrolling a page, following a link or closing the browser does not by itself constitute consent to analytics.

6. Google Analytics 4

Google Analytics 4 is provided by Google and is used to obtain aggregated information about website traffic.

The service may process information including:

  • pages visited;
  • date and time of a visit;
  • duration and sequence of page views;
  • traffic source;
  • browser, device and operating system information;
  • approximate geographical location;
  • events and interactions configured by the website owner;
  • pseudonymous browser and session identifiers.

Google Analytics 4 may set cookies including:

  • _ga — used to distinguish visitors;
  • _ga_<identifier> — used to maintain session state.

The default lifetime of these cookies may be up to two years, although the browser or the visitor’s settings may reduce the actual storage period.

The website does not use Google Signals, personalised advertising or Google Ads remarketing. If the purposes for which Google Analytics is used materially change, this Policy and the consent mechanism must be updated.

7. Yandex Metrica

Yandex Metrica is provided by Yandex and is used to analyse traffic and visitor interaction with the website.

The service may process information including:

  • pages visited;
  • traffic sources;
  • visit duration;
  • browser and device characteristics;
  • link navigation;
  • clicks and page scrolling;
  • pseudonymous browser identifiers;
  • interaction with website elements.

If Webvisor is enabled in the counter settings, Yandex Metrica may also create recordings of visitor interaction with website pages.

Yandex Metrica may use cookies, localStorage and sessionStorage.

Depending on the service configuration, the technologies used may include:

  • _ym_uid;
  • _ym_d;
  • _ym_isad;
  • _ym_visorc_*;
  • yandexuid;
  • yuidss;
  • ymex;
  • counter-specific localStorage entries.

Storage periods depend on the particular identifier and may range from the duration of a browser session to two years.

8. Microsoft Clarity

Microsoft Clarity is provided by Microsoft and is used to analyse how visitors interact with the website.

The service may collect and process information about:

  • navigation between pages;
  • clicks;
  • scrolling;
  • pointer movement;
  • screen and browser window size;
  • device and browser type;
  • visit duration;
  • technical errors;
  • sequences of actions on website pages.

Microsoft Clarity may generate heatmaps and session recordings. This information is used to identify usability issues, errors and website display problems.

To associate page views and sessions, Microsoft Clarity may use pseudonymous identifiers and cookies including:

  • _clck;
  • _clsk;
  • CLID;
  • ANONCHK;
  • MR;
  • MUID;
  • SM.

The actual cookie set and storage periods depend on Microsoft Clarity settings, the visitor’s browser and the visitor’s region.

9. Summary of technologies

Necessary technologies

Consent preference

  • technology: localStorage;
  • purpose: storing the selected analytics mode, decision version and date;
  • storage period: up to 12 months or until deleted by the visitor;
  • provider: olegzemtsov.com.

Theme preference

  • technology: localStorage;
  • purpose: remembering the light or dark theme;
  • storage period: until the preference is changed or browser data is deleted;
  • provider: olegzemtsov.com.

Analytics technologies

Google Analytics 4

  • example cookies: _ga, _ga_<identifier>;
  • purpose: statistics relating to visits, sessions, traffic sources and interactions;
  • storage period: generally up to two years;
  • enabled only after consent.

Yandex Metrica

  • example cookies and storage: _ym_uid, _ym_d, _ym_isad, _ym_visorc_*, yandexuid, ymex, localStorage;
  • purpose: traffic statistics and interaction analysis;
  • storage period: from one session to two years, depending on the technology;
  • enabled only after consent.

Microsoft Clarity

  • example cookies: _clck, _clsk, CLID, ANONCHK, MR, MUID, SM;
  • purpose: behavioural analysis, heatmaps and session recordings;
  • storage period: depends on the particular cookie and Microsoft settings;
  • enabled only after consent.

This list describes the main technologies. Actual cookie names and storage periods may be changed by the relevant service providers.

10. Obtaining consent

On the first visit, the website displays a notice offering two options:

  • “Allow analytics”;
  • “Necessary only”.

By selecting “Allow analytics”, the visitor agrees to the simultaneous activation of Google Analytics 4, Yandex Metrica and Microsoft Clarity.

By selecting “Necessary only”, the visitor rejects analytics and the website does not enable the listed services.

The selected decision is stored in the browser for up to 12 months.

After that period, the website may request consent again.

The website may also request consent earlier if:

  • this Policy is materially changed;
  • a new analytics service is introduced;
  • the purposes of processing change;
  • the structure of the technologies used changes;
  • the consent management mechanism is updated.

11. Changing or withdrawing consent

A visitor may change their decision at any time using the “Cookie settings” link located in the website footer.

The settings window provides two options:

  • allow analytics;
  • use necessary technologies only.

If a visitor withdraws previously provided consent:

  • the new decision is stored in the browser;
  • further loading of analytics services is stopped;
  • the website may remove first-party analytics cookies that it is technically able to remove;
  • the page may be reloaded in order to apply the new setting.

Withdrawal of consent does not affect the lawfulness of processing performed before consent was withdrawn.

The website may not be able to remove cookies stored on Google, Yandex or Microsoft domains. Such data can be removed through the visitor’s browser settings.

12. Browser controls

A visitor may use their browser settings to:

  • view stored cookies;
  • prevent cookies from being set;
  • remove individual or all cookies;
  • clear localStorage and sessionStorage;
  • block third-party cookies;
  • use private browsing;
  • use extensions that block analytics.

Removing necessary local preferences may cause the website to forget the selected theme and analytics decision.

Blocking analytics does not restrict access to the main website content.

13. Disclosure to third-party providers

When consent is provided, data may be transmitted to the providers of the connected services:

  • Google;
  • Yandex;
  • Microsoft.

These organisations process information in accordance with their own terms, service settings and privacy policies.

Depending on the visitor’s location and the provider’s infrastructure, data may be processed in other countries.

Further information about the providers, legal grounds, possible international transfers, storage periods and visitor rights is provided in the Privacy Policy.

14. Third-party websites

The website may contain links to third-party websites and services.

This Policy does not govern the use of cookies by those websites. After following an external link, the visitor should review the policies of the relevant third party.

15. Changes to this Policy

The website owner may update this Policy if there are changes to:

  • applicable law;
  • the analytics services used;
  • service settings;
  • technologies used;
  • purposes of data processing;
  • website functionality.

The current version will always be published on this page.

If a change is material, the website may remove the stored decision and request the visitor’s consent again.

16. Contact information

Questions concerning cookies, analytics settings or the processing of related information may be sent to:

Oleg Zemtsov

Website: olegzemtsov.com

Email: oleg9175495330@gmail.com