Effective Date: January 1, 2026 — Version: 1.0
1. Introduction
This Cookie Policy explains how K&z Limited (“k&z,” “we,” “us,” or “our”) uses cookies and similar tracking technologies when you visit our website (kandz.co), access our quantum AI infrastructure platform, or interact with our online services. This policy should be read alongside our Privacy Policy, which provides further details about how we process personal data.
By continuing to use our website after being presented with our cookie consent banner, you consent to the use of cookies as described in this policy. You may change your cookie preferences at any time using the methods described in Section 6 below.
2. What Are Cookies
Cookies are small text files placed on your device (computer, tablet, or mobile phone) when you visit a website. Cookies are widely used to make websites function properly, improve user experience, and provide information to website operators. Cookies may be set by the website you are visiting (“first-party cookies”) or by third parties whose content or services are embedded in the page (“third-party cookies”).
In addition to cookies, we may use similar technologies including:
- Web Beacons (Pixel Tags): Small transparent images embedded in web pages or emails that track page views and email opens.
- Local Storage: Data stored in your browser’s local storage or session storage, used to maintain application state and preferences.
- Device Fingerprinting: Collection of device attributes (such as screen resolution, browser plugins, and time zone) to create a unique identifier for security and fraud prevention purposes.
3. Types of Cookies We Use
3.1 Essential Cookies (Strictly Necessary)
These cookies are necessary for the website and platform to function properly. They enable core functionality such as authentication, session management, security features, and load balancing. Essential cookies cannot be disabled without impairing the functionality of the Services. No consent is required for essential cookies under applicable law.
3.2 Analytics and Performance Cookies
These cookies help us understand how visitors interact with our website and platform by collecting information about pages visited, time spent on pages, error messages encountered, and other usage metrics. This data is used to improve the performance and usability of our Services. Analytics cookies collect data in an aggregated and anonymous form.
3.3 Functionality and Preference Cookies
These cookies allow our website and platform to remember choices you have made, such as language preferences, display settings, dashboard layouts, and notification preferences. They provide enhanced, personalized features and help us tailor your experience.
3.4 Marketing and Advertising Cookies
These cookies are used to track visitors across websites and display relevant advertisements. They may be set by third-party advertising partners and are used to build a profile of your interests and show you relevant content on other sites. k&z uses marketing cookies sparingly and only with your explicit consent.
4. Specific Cookies Used
The following table provides details about the specific cookies used on the k&z website and platform:
| Cookie Name | Provider | Type | Purpose | Duration |
|---|---|---|---|---|
kz_session |
k&z (First Party) | Essential | Maintains your authenticated session on the k&z platform. Contains an encrypted session identifier. | Session (expires when browser closes) |
kz_csrf |
k&z (First Party) | Essential | Cross-site request forgery (CSRF) protection token. Prevents unauthorized form submissions. | Session |
kz_auth |
k&z (First Party) | Essential | Stores authentication token for API access and persistent login functionality. | 30 days |
kz_consent |
k&z (First Party) | Essential | Records your cookie consent preferences. Required to honor your cookie choices. | 365 days |
kz_lb |
k&z (First Party) | Essential | Load balancer cookie ensuring your requests are routed to the same server during a session. | Session |
kz_prefs |
k&z (First Party) | Functionality | Stores user interface preferences including language, theme (dark/light), dashboard layout, and notification settings. | 365 days |
kz_timezone |
k&z (First Party) | Functionality | Stores your time zone preference for displaying QPU scheduling times and log timestamps. | 365 days |
kz_recent |
k&z (First Party) | Functionality | Tracks recently accessed QPU jobs and projects for quick navigation within the platform. | 30 days |
_ga |
Google Analytics (Third Party) | Analytics | Distinguishes unique visitors by assigning a randomly generated identifier. Used to calculate visitor, session, and campaign data. | 2 years |
_ga_* |
Google Analytics (Third Party) | Analytics | Used by Google Analytics 4 to store and count page views. | 2 years |
_gid |
Google Analytics (Third Party) | Analytics | Distinguishes unique visitors. Used to throttle request rate. | 24 hours |
_gat_UA-* |
Google Analytics (Third Party) | Analytics | Throttles the request rate to Google Analytics to limit data collection on high-traffic sites. | 1 minute |
ph_* |
PostHog (Third Party) | Analytics | Product analytics for understanding user behavior within the platform, feature adoption tracking, and funnel analysis. | 1 year |
intercom-* |
Intercom (Third Party) | Functionality | Powers the live chat and support widget. Maintains conversation state and user identity across page loads. | 9 months |
hubspotutk |
HubSpot (Third Party) | Marketing | Tracks visitor identity for marketing automation and lead management. Only set with explicit consent. | 13 months |
__hstc |
HubSpot (Third Party) | Marketing | Tracks visitor sessions for marketing campaign attribution. Only set with explicit consent. | 13 months |
5. Third-Party Cookies
Certain cookies are placed by third-party services that appear on our pages. k&z does not control the use of these cookies. The following third parties may set cookies when you use the k&z website:
- Google Analytics: Web analytics service that helps us understand how visitors use our website. Google’s privacy policy is available at policies.google.com/privacy.
- PostHog: Product analytics platform used to understand feature usage patterns within the k&z platform. PostHog’s privacy policy is available on their website.
- Intercom: Customer messaging platform powering our live chat and support functionality. Intercom’s privacy policy is available on their website.
- HubSpot: Marketing automation platform used for lead management and marketing communications (only with your consent). HubSpot’s privacy policy is available on their website.
- Stripe: Payment processing service that may set cookies during payment transactions to prevent fraud and ensure PCI DSS compliance. Stripe’s privacy policy is available on their website.
6. How to Manage Cookies
6.1 Cookie Consent Banner
When you first visit the k&z website, you will be presented with a cookie consent banner that allows you to accept or reject non-essential cookies. You can modify your preferences at any time by clicking the “Cookie Preferences” link in the footer of any page on our website.
6.2 Browser Settings
Most web browsers allow you to manage cookies through their settings. You can typically configure your browser to:
- Block all cookies or only third-party cookies;
- Delete existing cookies;
- Receive a notification before a cookie is set;
- Allow cookies from specific websites only.
Please note that disabling essential cookies may prevent the k&z platform from functioning properly. Instructions for managing cookies in common browsers:
- Chrome: Settings > Privacy and Security > Cookies and Other Site Data
- Firefox: Settings > Privacy & Security > Cookies and Site Data
- Safari: Preferences > Privacy > Manage Website Data
- Edge: Settings > Cookies and Site Permissions > Manage and Delete Cookies and Site Data
6.3 Opt-Out of Analytics
You may opt out of Google Analytics tracking by installing the Google Analytics Opt-Out Browser Add-on, available at tools.google.com/dlpage/gaoptout.
6.4 Do Not Track
Some browsers offer a “Do Not Track” (DNT) setting. k&z currently does not respond to DNT signals, as there is no industry-standard protocol for honoring DNT requests. However, you can manage your tracking preferences through our cookie consent mechanism as described above.
7. Consent Mechanism
7.1 Granular Consent
Our cookie consent mechanism provides granular control, allowing you to separately consent to or reject each category of non-essential cookies (Analytics, Functionality, Marketing). Essential cookies do not require consent and cannot be disabled through the consent mechanism.
7.2 Withdrawal of Consent
You may withdraw your consent for non-essential cookies at any time by accessing the “Cookie Preferences” tool on our website. Upon withdrawal, the relevant cookies will be deleted, and no new cookies of that category will be set. Withdrawal of consent does not affect the lawfulness of processing based on consent before its withdrawal.
7.3 Consent Records
k&z maintains records of cookie consents and withdrawals as required by applicable law. The kz_consent cookie stores a hashed record of your preferences, and detailed consent logs are maintained server-side for compliance purposes.
8. Updates to This Policy
We may update this Cookie Policy from time to time to reflect changes in the cookies we use, changes in technology, or changes in applicable law. We will post the updated policy on our website with a revised “Effective Date.” If we make material changes to this policy, we will display an updated cookie consent banner to obtain your consent where required.
9. Contact Information
If you have any questions about this Cookie Policy or our use of cookies, please contact us:
- Email: support@kandz.co
- Data Protection Officer: support@kandz.co
- Mail: K&z Limited, Privacy Team, Flat 10198, 10/F, Liven House, No. 61-63 King Yip Street, Kwun Tong, Kowloon, Hong Kong