Starry Sky Stacker reduces noise in pictures of the night sky that are captured as a sequence of exposures taken with a modern dSLR or mirrorless camera using an equatorial mount. Starry Sky Stacker aligns the images to compensate for errors in tracking, assigns a quality estimate to each image, allows the user to select images based on the quality estimate, and finds the median. The resulting image has much less noise than any of the original images. Neither alt-azimuth mounts nor cameras that generate FITS files are not supported.