Cookies and Local Storage

Dynamic Yield stores personal data in cookies and local storage to create personalized
experiences on your website. In this article, you can see our classification of these cookies to support you with your own classification requirements under applicable data privacy regulations.

Most of these cookies are created by the Dynamic Yield script embedded on
your site. These cookies are stored on the dynamicyield.com cookie domain, or on your
second-level domain (SLD). Your SLD is a part of your site's URL address.

When working with the Experience OS Landing Pages app without setting up a custom domain,
the content is served by a Dynamic Yield domain (adserve.io). This domain then also hosts
cookies designated to your SLD.

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Note

In accordance with applicable privacy laws, we limit the storage time of all cookies to a maximum of 365 days.

Performance, analytics, and personalization cookies

The following cookies are used to detect browser-specific behavior, to conduct experimentation
and analytics, and for personalization purposes.

NameDescriptionTTLCookie Domain
DYIDA Dynamic Yield unique identifier that operates as a key for personalization (tailoring the content users see on your website).1 yeardynamicyield.com
_dyidA Dynamic Yield unique identifier that operates as a key for personalization (tailoring the content users see on your website).30 daysCustomer’s SLD
_dyid_serverA Dynamic Yield unique identifier that operates as a key for personalization.1 yearCustomer’s SLD
DYSESA Dynamic Yield unique identifier that operates as a key for personalization. It tracks user sessions to monitor performance and learn about user activities to optimize the personalization of content users see on your website.browser sessiondynamicyield.com
_dyjsessionA Dynamic Yield unique identifier that operates as a key for personalization. It tracks user sessions to monitor performance and learn about user activities to optimize the personalization of content users see on your website.browser sessionCustomer's SLD
_dy_csc_sesTracks when a user closes their browser. Is necessary for the Dynamic Yield script to function properly.browser sessionCustomer’s SLD
_dycmcIdentifies users who regularly delete cookies ("cookie deleters"). Is necessary for the Dynamic Yield script to function properly.30 daysCustomer’s SLD
_dycnstUsed to remember user cookie consent preferences. Is necessary for the Dynamic Yield script to function properly.30 daysCustomer’s SLD
_dy_lu_sesDetermines the first page URL a user comes from, and its validity.browser sessionCustomer's SLD
_dy_df_geoUsed for audience creation purposes to store geographical location data (country, state, city).30 daysCustomer's SLD
_dy_geoUsed for audience creation purposes to store geographical location data (country, continent, area, city).30 daysCustomer's SLD
_dycstUsed for audience creation purposes to collect data about the user-agent and associated window size.30 daysCustomer's SLD
_dy_ses_load_seqUsed for experimentation and A/B testing purposes, to detect browser sessions.30 daysCustomer's SLD
_dy_soctControls the frequency of periodically-activated campaigns. Without this cookie, periodically-activated campaigns would be either disabled or executed upon every page load.1 yearCustomer's SLD
_dy_toffsetValidates the user's clock drift (for computers that don't sync their clock with the internet).30 daysCustomer’s SLD
dy_fs_pageIndicates the URL of the first page a user visits when they start a session on a website, and targets a user by the first page of their session.browser sessionCustomer's SLD
_dy_cs_storage_itemsUsed for proprietary custom implementation on your website, for Dynamic Yield campaigns to operate correctly.✔ / 30 daysCustomer's SLD
_dy_cs_cookie_itemsUsed for proprietary custom implementation on your website, for Dynamic Yield campaigns to operate correctly.✔ / 30 daysCustomer's SLD

Data stored in local storage

NameDescription
_dyuss_Used for audience creation purposes to provide the user state in a real-time audience segmentation system (session-oriented).
dyaud_sessUsed for audience creation purposes to provide the user state in a real-time audience segmentation system (session-oriented).
_dy_weather_Used for audience creation purposes to display local weather forecasts to the user immediately upon returning to the website or offer suggestions based on their past interactions with weather data.
_dy_cweather_Used for audience creation purposes to display local weather forecasts to the user immediately upon returning to the website or offer suggestions based on their past interactions with weather data.
_dy_tsrcUsed for audience creation purposes to track and analyze the cached source of traffic that brings a visitor to a website.
_dyaud_nchcUsed for audience creation purposes to track and manage real-time audience users and deliver more relevant content to different segments of users.
_dyaud_pageUsed for audience creation purposes to track and manage real-time audience visitors and deliver more relevant content to different segments of visitors.
_dy_deviceUsed for audience creation purposes to cache coarse device data (for example, brand, or tablet vs. smartphone).
_dy_cscUsed for experimentation and A/B testing purposes to keep track of events for the "elapsed time" condition.
_dyexps, _dy_att_expsUsed for experimentation and A/B testing purposes to keep the state of experiment selections and attribution. It helps track which variant of the experiment a user is assigned to and records their interactions with the website accordingly.
_dyrcTracks user engagement actions that were not successfully sent to the server during the previous pageview. It typically includes information indicating whether another attempt to send the data should be made.
_dybatchTracks user engagement actions that were not successfully sent to the server during the previous pageview. It typically includes information indicating whether another attempt to send the data should be made.
_dy_cs_session_itemsUsed for proprietary custom implementation on your website, for Dynamic Yield campaigns to operate correctly.
_dy_cs_local_itemsUsed for proprietary custom implementation on your website, for Dynamic Yield campaigns to operate correctly.