pip install qiskit pennylane pytket stim Then open a Jupyter notebook and build your first circuit. The only thing you have to lose is the assumption that quantum is out of reach.
With open source, the answer is always: Look at the source. free open source quantum services
Proprietary quantum clouds are "black boxes." When your simulation fails, is it your code, or a bug in the closed-source simulator? When you pay per shot on a real device, can you verify the result wasn't corrupted by a known bug? pip install qiskit pennylane pytket stim Then open