Yes, Squirrly supports RTL languages.
We’ve been blessed to have an amazing customer in Egypt helping us all the way through our right to left implementations. He has helped us iron out all the details and since then we’ve had many users confirming that our (Right-to-Left) RTL works really well.
You can use Squirrly SEO plugin in all countries and all WordPress languages.
Our Bulk SEO feature works with all WordPress popular multilingual plugins and you can optimize the SEO Snippet in any language.
You can use the Keyword Research tool from Squirrly SEO to search for keywords in 140 countries.