> Clerk, the authentication and user management service for web apps: which cookies it uses to keep users signed in and how they fit with GDPR consent. > > Canonical: https://www.flowconsent.com/en/services/security/clerk Security # Clerk Essential · [Official website](https://clerk.dev) Clerk is a user authentication and management service for web applications, offering sign-up and sign-in components, session management and user profiles for frameworks such as React and Next.js. It uses cookies to keep users signed in, which are generally considered necessary for the service. [Block Clerk until consent](https://app.flowconsent.com/auth/sign-up?utm_source=flowconsent.com\&utm_medium=referral\&utm_campaign=security) · [Scan my site](https://www.flowconsent.com/en/scan) At a glance - Category [Security](https://www.flowconsent.com/en/services/security) - Consent Essential - Prior consent Required - Documented cookies 0 Compliance ## Clerk and the GDPR Clerk is classified as “Essential”. On a site that targets European visitors, it must only load after the visitor consents, and it must be listed in your cookie policy. Cookies and trackers ## What Clerk sets and contacts The cookies of Clerk are not documented in the catalog yet. To see what is actually set on your site, run a free scan. [Scan my site](https://www.flowconsent.com/en/scan) Same category ## More services: Security [See the whole category](https://www.flowconsent.com/en/services/security) ### [Friendly Captcha](https://www.flowconsent.com/en/services/security/friendly-captcha) [Friendly Captcha is a bot detection and CAPTCHA solution that protects websites from automated abuse, spam, and fraud. It uses advanced risk analysis and challenge mechanisms to distinguish legitimate users from bots without creating friction. Friendly Captcha defends against credential stuffing, fake accounts, and automated scraping while maintaining smooth user experience. With adaptive security that evolves against threats, Friendly Captcha safeguards web applications and data.](https://www.flowconsent.com/en/services/security/friendly-captcha) [Essential](https://www.flowconsent.com/en/services/security/friendly-captcha) · ### [ThreatMetrix](https://www.flowconsent.com/en/services/security/threatmetrix) [ThreatMetrix is a foundational web service that powers critical website functions and digital experiences. It provides reliable infrastructure, seamless integration capabilities, and consistent performance across all devices and browsers. ThreatMetrix supports modern development practices and scales with growing business needs. With a focus on stability and compatibility, ThreatMetrix ensures your website delivers a smooth, uninterrupted experience to every visitor and search engine crawler.](https://www.flowconsent.com/en/services/security/threatmetrix) [Essential](https://www.flowconsent.com/en/services/security/threatmetrix) · ### [LoginRadius](https://www.flowconsent.com/en/services/security/loginradius) [LoginRadius is a digital analytics solution that helps businesses measure and understand their online performance through comprehensive data collection and analysis. It provides visitor tracking, behavioral insights, and conversion metrics across websites and applications. LoginRadius supports custom event tracking, audience segmentation, and automated reporting. With intuitive dashboards and visualization tools, LoginRadius enables informed decisions that improve experience and drive results.](https://www.flowconsent.com/en/services/security/loginradius) [Essential](https://www.flowconsent.com/en/services/security/loginradius) · ### [SAP Customer Data Cloud Sign-in](https://www.flowconsent.com/en/services/security/sap-customer-data-cloud-sign-in) [SAP Customer Data Cloud Sign-in is a web hosting and cloud infrastructure provider delivering reliable, scalable hosting solutions for websites and applications of all sizes. It offers shared, VPS, and dedicated server options with SSD storage, global CDN, and automated backups. SAP Customer Data Cloud Sign-in provides one-click deployment, managed databases, and 24/7 monitoring. With high uptime guarantees and developer-friendly tools, SAP Customer Data Cloud Sign-in ensures optimal performance at scale.](https://www.flowconsent.com/en/services/security/sap-customer-data-cloud-sign-in) [Essential](https://www.flowconsent.com/en/services/security/sap-customer-data-cloud-sign-in) · ### [Qualva](https://www.flowconsent.com/en/services/security/qualva) [Qualva is a foundational web service that powers critical website functions and digital experiences. It provides reliable infrastructure, seamless integration capabilities, and consistent performance across all devices and browsers. Qualva supports modern development practices and scales with growing business needs. With a focus on stability and compatibility, Qualva ensures your website delivers a smooth, uninterrupted experience to every visitor and search engine crawler.](https://www.flowconsent.com/en/services/security/qualva) [Essential](https://www.flowconsent.com/en/services/security/qualva) · ### [Fraud Blocker](https://www.flowconsent.com/en/services/security/fraud-blocker) [Fraud Blocker is a fraud prevention platform that helps businesses detect and block fraudulent transactions and activities in real time. It uses machine learning and behavioral analysis to identify suspicious patterns across payments, accounts, and interactions. Fraud Blocker reduces chargebacks, prevents account takeover, and protects revenue while minimizing false positives. With customizable rules and real-time scoring, Fraud Blocker adapts to evolving threats.](https://www.flowconsent.com/en/services/security/fraud-blocker) [Essential](https://www.flowconsent.com/en/services/security/fraud-blocker) ## Make your site compliant today. Free up to 25,000 sessions a month. No credit card, no commitment. [Create my banner](https://app.flowconsent.com/auth/sign-up?utm_source=flowconsent.com\&utm_medium=referral\&utm_campaign=general) · [Scan my site](https://www.flowconsent.com/en/scan)