VATIT Group S.a.r.l. is one of OPTI's top rivals. VATIT Group S.a.r.l. is a Private company that was founded in 2000 in Luxembourg, Luxembourg. Like OPTI, VATIT Group S.a.r.l. also works within the Professional Services industry. Compared to OPTI, VATIT Group S.a.r.l. has 1,090 more employees.
Taxback International is seen as one of OPTI's biggest rivals. Taxback International was founded in 1996 in Kilkenny, County Kilkenny. Like OPTI, Taxback International also competes in the Professional Services sector. Taxback International generates $148M more revenue than OPTI.