Photon Spot, Inc. specializes in sub-Kelvin cryogenic systems and superconducting nanowire single-photon detectors. Their detectors exhibit ultralow dark counts, sub-100ps jitter, and >90% quantum efficiency near 1550nm, catering to applications in free-space optical communication, quantum optics experiments, linear optics quantum computing, and semiconductor diagnostics. The company's fully-automated closed-cycle cryostats deliver temperatures below 1K without the need for liquid helium, offering a cost-effective alternative for experiments requiring temperatures in the 0.8K - 1K range. Photon Spot provides modular system architecture for mix-and-match pairing of detectors and cryogenics, allowing customization to meet specific needs.