Check out some ideas of when to use Rule Builder and then get started with our guides!

Target parameters to create image-based dynamic content
Define which custom images are served to individual subscribers with rules that map data fields from your CRM to images of your choice. You could choose to show a certain segment of customers, like VIP members, a specific banner or graphic and easily swap out that image by editing the rule—no code changes necessary!
Target time
Send time-sensitive communications by creating a rule that determines the content based on the date an email contact is merged or when an email is opened. This is helpful when communicating a policy or plan renewal, travel status messages, and anything else that needs to be communicated at just the right time.
Target weather
The weather can be unpredictable, but your email content doesn't have to be. Determine which content to show based on the weather conditions—like sun, rain, or snow—at the time a subscriber opens an email. Combine with temperature-based content targeting (in either Celcius or Fahrenheit) for added relevancy.
Target weather forecasts
Target devices to display operating system-specific content
Create a rule to automatically adjust content, like calls to action, based on the device operating system being used. If a subscriber is opening an email on a mobile phone, customize the call to action to direct them to their phone's app store. If they open on a desktop, drive directly to the website.
Target geo-location based on CRM location data
Use data fields from your CRM, like delivery city, and show specific content to users with selected values. For example, if the delivery city equals "London" you could choose to show a banner for an event in London but show different content if the delivery city field is anything else.

Learn how to create a Rule Builder campaign for your use case: