: The primary consideration in choosing a wave function method is its accuracy. HF often proves insufficient for systems where correlation effects are significant. MP2 strikes a good balance for many organic and inorganic molecules. However, for highly correlated systems or those requiring very high accuracy (e.g., transition states, non-bonding interactions), CCSD(T) or similar methods are indispensable.

Which of those would you like?

One of the standout features of Spartan is its graphical user interface (GUI). For anyone who has struggled with command-line inputs for computational software, Spartan was a game-changer. The '14 version allowed users to:

: Best for standard geometry and frequency calculations in a solvent. It uses a dielectric screening factor to simulate the environment.

: You can typically request a trial version from Wavefunction to test the software's performance on your specific molecular systems before purchasing.