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In this paper, we have investigated the structural, elastic, optoelectronic and thermoelectric properties of the new half-Heusler alloys TiXSb (X: Ru, Pt) and Ti 2 RuPtSb 2 double half-Heusler compound, using the full-potential linearized augmented plane wave method. Different approximations for the exchange-correlation functional were performed as generalized gradient approximation + Hubbard potential (GGA + U) and its combination with the modified Becke-Johnson potential. The negative values of the calculated formation energy indicate that these compounds are energetically stable. Both half Heusler alloys are halfmetallic ferromagnetic materials and exhibit an integer magnetic moment of Mt = 1.00 μ B .While, the Ti 2 RuPtSb 2 is a direct semiconductor at center symmetry. The calculations of optical properties revealed that Ti 2 RuPtSb 2 compound exhibits an excellent optical efficiency. The thermoelectric properties such as the Seebeck coefficient (S); electronic thermal conductivity (κ e /τ), power factor (PF), and figure of merit (ZT) have been studied and discussed in detail. Consequently, the investigated compounds were identified as candidate materials for high technological applications.