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Cardiac assist devices are crucial treatment modalities for end\u2010stage HF, but they still face limitations, such as direct blood contact and high power consumption. We present a lightweight (&lt;60\u2009g), compact, electroactive polymer (EAP)\u2010based cardiac assist device (E\u2010CAD) as a nonblood\u2010contacting, low\u2010power alternative to address these limitations. E\u2010CAD consists of EAP units paired with negative bias springs (NBSs), mounted on a flexible sleeve that wraps around the heart to assist in cardiac compression. The device is designed to be biomimetic to match the regionally varying mechanical stiffness of the heart. Benchtop silicone phantom and ex\u2009vivo porcine tests demonstrated E\u2010CAD's ability to increase volume displacement by 1.21\u2010fold in benchtop tests with a silicone phantom and 1.17\u2010fold in ex\u2009vivo settings, along with an associated increase in ejection fraction, compared to cases without the device. Furthermore, it operates on low power (&lt;0.3\u2009W), enabling a compact design with a thin driveline (outer diameter = 0.3\u2009mm), which reduces infection risk. In summary, we showed that EAP\u2010based direct cardiac compression was feasible with low power demand. 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