The supplemental information provides detailed insights into the characterization and dynamics of stable organic radical qubits, which are crucial for quantum information science. It includes figures and schemes illustrating various radical structures, such as triphenylmethyl radicals, nitroxide radicals, semiquinone radicals, and macrocyclic conjugated radicals. The text also explains the methods used to characterize these qubits, including pulse electron paramagnetic resonance (EPR) spectroscopy, which measures T1 (spin relaxation time), Tm (spin decoherence time), and Rabi oscillations (spin manipulation). The influence of Larmor frequency on electron spin dynamics is discussed, highlighting how different spin relaxation processes are frequency-dependent. Additionally, the text references several studies that explore the frequency dependence of T1 and Tm for various radicals, emphasizing the need for further investigation into this phenomenon.The supplemental information provides detailed insights into the characterization and dynamics of stable organic radical qubits, which are crucial for quantum information science. It includes figures and schemes illustrating various radical structures, such as triphenylmethyl radicals, nitroxide radicals, semiquinone radicals, and macrocyclic conjugated radicals. The text also explains the methods used to characterize these qubits, including pulse electron paramagnetic resonance (EPR) spectroscopy, which measures T1 (spin relaxation time), Tm (spin decoherence time), and Rabi oscillations (spin manipulation). The influence of Larmor frequency on electron spin dynamics is discussed, highlighting how different spin relaxation processes are frequency-dependent. Additionally, the text references several studies that explore the frequency dependence of T1 and Tm for various radicals, emphasizing the need for further investigation into this phenomenon.