Anyone carrying a smartphone has the potential access to an electrical power bank capable of spinning a lab-disc, a sensor for imaging and the processing power to analyze data. Here, exploit the electrical power stored in smartphones to introduce a smartphone operated centrifugal platform made of cardboard and a small motor to provide a low-cost, portable, sample-to-answer centrifugal diagnostic systems, specifically designed to meet the needs in resource-limited-settings. As a proof of principle, sandwich ELISA immunoassay for detection of interleukin-2 and hematocrit level measurement are demonstrated.