CALYPSO is a circuit-based solver from the University of Bologna for no-insulation HTS coils (used when reliability and operational stability are critical), that resolves magnetization currents inside each tape and inter-turn currents, via a non-linear lumped circuit model. The model can also be applied to the computation of losses in HTS conductors based on twisted-stacked or other configurations. Originating from fusion needs, it captures charging delays, current bypass and loss levels consistent with representative NI-HTS cases. For industry it reduces cryogenic testing and design cycles, improves stability and protection settings, and applies beyond fusion to accelerator magnets, MRI and NMR magnets, and HTS power devices; collaboration options include simulation on customer data, parameter identification, joint R&D, training, model transfer and licensing.