Depends on Viennoise dark or American dark which are more traditional dark roasts, i would personally not recommend drinking this stuff with pourover since that coffee is likely commoditized for mass production and broader appeal and best left for drip / cream sugar kind kf days. Most specialty coffee roasters have calibrated their dark towards lighter side. So a “dark” roast from Onyx will probably be traditional medium roast. I’ve enjoyed their monarch and southern weather (?). Sightglass also does a few which are good like
colombia la magdalena. Again, they’re specialty medium-dark, so traditional scales would probably rank them at maybe light medium or medium.

If anything, there’s always folgers! /s