Hex A.D.'s music is doomy and heavy, based on heavy guitar riffs. But their music also clearly shows the members' progressive preferences. The band's classic rock sound reminds a bit of the 1970s, without being retro.
Frontman Rick Hagan composes both lyrics and melodies, and he takes the main responsibility in the studio where he plays all instruments besides keys. Organ and mellotron are handled by maestro Magnus Johansen, both live and in studio.

Since 2011, the band has been working closely with producer Chris Tsangarides who has done his magic with the band's albums. On stage the band emphasizes spontaneity and improvisation, and this is where the magic really happens. For a number of years, Magnus has been working closely with Jon Lord from Deep Purple, and if there is one person who really knows what it means to play on the edge, it must be him. This love for the spontaneous and intense is also shared by the band's rhythm section; bassist 'Arry Gogstad and drummer Matt Hagan prefer it loud, dangerous and alive.

Several of the band members have for a number of years been touring in Europe and Asia with artists like Blaze Bayley, Paul Di'Anno, Geoff Nicholls, Bernie Marsden, Ripper Owens and Rowan Robertson, known for his time in Dio. Robertson has on several occasions been a guest with Hex A.D. on stage