Prompt Engineering Playground
Build prompts with {{variable}} substitution. Detected variables appear as pills to fill in quickly.
How to Use Variable Substitution
Wrap variable names in double curly braces: {{variable_name}}. The playground detects all variables and creates input fields. Fill them in and click Build Prompt to see the final prompt with all substitutions applied.
Important Notes
- Client-side processing only — no data sent to server.
- Variables are case-sensitive:
{{Name}}and{{name}}are different. - Free to use with no login/signup required.
- Report bugs in comments with sample input and expected output.
Comments & Discussion
Facing issues? Have questions? Post them here! We're happy to help!