Soulver comes with a number of options for using the Soulver engine outside of Soulver itself.
Command line tool
The Soulver Command Line Interface (or CLI) can be installed by going Soulver > Integrations > Terminal (Command Line Interface)
A 'soulver' alias will be created in /usr/local/bin/ to a command-line tool inside Soulver's bundle. This will allow you to use the soulver command from Terminal. All Soulver's features are present, including variables, currency conversions & date & time calculations:
$ soulver June 20 + 3 weeks
You can also pipe a list of lines to Soulver and each line will be evaluated. These lines may contain variables.
We offer an Alfred workflow that lets you perform calculations using Soulver.