--- title: "Lytics Limitations" description: "Explore Contentstack Lytics limits for events, profiles, and integrations, and learn how to request limit increases." url: "https://www.contentstack.com/docs/lytics/limitations" product: "Contentstack" doc_type: "guide" audience: - developers - admins version: "current" last_updated: "2026-07-28" --- # Lytics Limitations The system enforces the following limits to ensure the optimal performance of the Lytics platform and its connected sites, data sources, and applications. Unless otherwise noted, these limits apply to all accounts. If you have questions, contact your **Lytics Account Manager**. ### Events An **event** refers to: * Any action or activity a user performs * Any update to a profile * Any export from the subscription services Resource Limit Description Max input size 4 KB Byte size of a single input record. Max size in batch 16 KB Byte size of a single input record within a batch. Max size total batch 1 GB Byte size of all records within a batch. Max event ingress rate Quota based on pricing Events collected per hour. Max output size 1 MB Byte size of a single output record, also known as a trigger event. Max trigger event egress rate Quota based on pricing Events triggered per hour. ### User Profiles A [**user profile**](https://docs.lytics.com/docs/understanding-user-profiles) is the living record of an individual who interacts with your brand. Lytics user profiles provide a unified view of your customers across connected channels. * **Known profiles** include at least one identifiable attribute, such as an email address or CRM ID. * **Anonymous profiles** contain only anonymous identifiers, such as a cookie ID. Resource Limit Description Max size of a user profile 1 MB Byte size of a single user profile. Max size of a profile identifier 256 bytes Unique identifiers used to merge data fragments into a single user profile. See **Profile Stitching Best Practices**. Max number of user attribute values on a profile 1,000 Includes items in complex field types such as maps and sets. Max aggregate size of all user profiles Quota based on pricing Total size of all user profiles. Max number of custom mapped fields Quota based on pricing Custom mapping of fields through Queries & LQL. Max stitched identifiers 50 Stitched identifiers (e.g., email, user ID) that can be used to look up a user. ### Audiences An [**audience**](https://docs.lytics.com/docs/audiences) is a group of users defined by conditions, attributes, or behaviors. Audiences allow you to segment users for targeting, personalization, or analysis. Resource Limit Description Max number of audiences 500 Total number of audiences allowed per account. Max number of conditions per audience 1,000 Includes both parent and nested conditions. Max audience re-evaluation rate Quota based on pricing Maximum number of profiles reevaluated per hour across all time-based audiences. Max length of audience name 64 characters Maximum length of audience names displayed in the Lytics UI. ### Browsers and Cookies The following limits apply to client-side integrations. These are implemented in browser-facing code using the [**Lytics JavaScript tag**](https://docs.lytics.com/docs/developer-quickstart-3-install-lytics). Resource Limit Description Max number of audiences stored as a cookie 5 MB Applies only to Lytics JavaScript Tag v2. Version 3 uses local storage. Max cookie size per domain 4,096 bytes Includes both Lytics cookies and other domain-specific cookies. Maximum size of collect payload via URL 2,000 bytes Keep payloads small enough for GIF transport. Use iframe transport for larger payloads. ### Integrations The following limits apply to [**server-side integrations**](https://docs.lytics.com/docs/integrated-marketing-tools#server-to-server-integrations), which allow Lytics to communicate directly with third-party services. Resource Limit Description Max active import integrations 100 Import integrations ingest data into Lytics. Max active export integrations 200 Export integrations send data from Lytics to third-party tools. Max integration creations per hour 10 Includes imports, exports, and enrichment workflows. Max lifetime of completed jobs 90 days Retention for jobs with a **completed** status. Max lifetime of paused/failed jobs 90 days Retention for jobs in **paused** or **failed** status. ### Content The **Lytics** [**Content Affinity Engine**](https://docs.lytics.com/docs/content-affinity) uses NLP to analyze content and calculate user-level affinities. Resource Limit Description Max URLs enriched 20,000/month Number of content URLs enriched monthly. Max topics displayed 500 Maximum topics shown on a user profile. Max topics per user 50 Up to 50 retained affinities per user. Max Interest Engines 10 Maximum Interest Engines per account. ### Custom Modeling **Lytics** enables you to build [**custom Lookalike Models**](https://docs.lytics.com/docs/ml-modeling). Resource Limit Description Lookalike Model count 20 Maximum activated Lookalike Models per account. Max model audience size 20M users Maximum audience size for source/target segment in a Lookalike Model. ### Personalize The following default limits and constraints apply to **Contentstack** [Personalize](/docs/personalize/about-personalize) Feature Limit Description Lytics per organization 3 Maximum number Lytics instances allowed per organization. Users per Lytics project Unlimited Maximum users supported Lytics project. Audiences per project 500 Maximum number of audiences per Personalize project. Accounts per organization 3 Default limit of connected accounts per organization. Data retention 3 months Retention policy for stored events and profiles. **Requesting Limit Increases:** To increase any of the default limits above, contact [Contentstack Support](mailto:support@contentstack.com) with your organization ID, stack/project name, and a short explanation of your use case.