We have an assortment of designs that allow you to put captions on each photo, so that you can have different text for each slide. These designs are under the "Slideshows" category in the Design Catalog. You will continue to see new slideshow designs on a regular basis as we add new content. This blog post walks you through all of the types of designs available in Ripl.
In the desktop version of the Ripl app, once you add more than 1 photo to a slideshow design, arrows will appear on the side of your posts which will allow you to switch between slides and add additional captions by clicking on the tap to add caption text.
For more instruction on creating a slideshow, check out this tutorial.