Expressions let you transform data and compute values inside your flows—similar to Excel formulas. Use expressions when you need functions (like upper()), math, date logic, or conditional formatting. In RapidPro.app, expressions are wrapped in @(…) so the platform knows exactly what should be evaluated.

4 min read Expressions Updated on: 22/12/2025 Logical Comparisons: Testing Conditions (Equal, Greater Than, Less Than) Logical comparisons are expressions that evaluate to TRUE or FALSE. In RapidPro.app, you’ll use them to route contacts in Split by Expression, validate responses (like age checks or thresholds), and apply conditional logic in updates and messages. Quick setup […]