Hi Kate,
Thanks for using the REDUCE Suite and for posting your question on the Forum.
Yes, LogoGenerator is applicable to RNA as well as DNA. You just need to specify an additional -rna option on the command-line, and everything else should work as expected. Please have a try and report back any issues you may have.
Best regards,
Xiang-Jun
PS. The REDUCE Suite has more features than those documented (with the command-line "-h" option). The default settings are designed to work for its advertised purpose only.