> For the complete documentation index, see [llms.txt](https://kbase.whitelabel-loyalty.com/product/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kbase.whitelabel-loyalty.com/product/loyalty-engine/audiences/audience-criteria.md).
# Audience criteria
Creating meaningful and targeted audiences is a core part of using the Loyalty Engine effectively. Our platform offers two powerful ways to define audience criteria — **Query Builder** and **Expression Editor**. Each method provides different levels of control and complexity, allowing you to build segments that match your use case, whether you need simple rules or advanced logic.
This page introduces both options to help you choose the right approach for your audience strategy. You can explore each in more detail on their dedicated pages.
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## Query builder
The Query Builder is a visual, user-friendly tool that lets you create audience segments using predefined criteria. It’s ideal for marketers and analysts who want to quickly define rules based on customer attributes, actions, or engagement data — without needing to write code or logic.
#### Key benefits
* Visual, no-code interface
* Fast to set up with predefined criteria options
#### Limitations
* Less flexible for highly specific or custom conditions
* Difficult to represent complex logic or calculations
* Can't calculate event values across a range of events (e.g., totalling how much was spent in a given month across all transaction events)
:magnifying-glass-arrow-right: **Find out more in the** [Audience query builder](/product/loyalty-engine/audiences/audience-criteria/audience-query-builder.md) **article.**
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## Expression editor
The Expression Editor is a more advanced tool that gives you full control over your audience logic. It uses JSONata expressions to allow you to define complex conditions, use nested logic, or reference calculated fields across multiple events or data sources.
#### Key benefits
* Maximum flexibility for complex audience definitions
* Supports advanced logic, grouping, and time-based calculations
* Can utilise variables to enable easy duplication of audience logic
#### Limitations
* Requires familiarity with JSONata
:magnifying-glass-arrow-right: **Find out more in the** [Audience expression editor](/product/loyalty-engine/audiences/audience-criteria/audience-expression-editor.md) **article.**
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