Samsung Captivate is the AT&T specific version of Samsung’s Galaxy S. The device sports a 4.0″ WVGA Super AMOLED display, driven by a PowerVR GPU, which was the fastest graphics processor available in any smartphone at the time of its release. The Captivate is powered by a 1GHz Cortex A8 processor, with 512MB RAM and 16GB storage, along with a microSD slot which supports up to 32GB.
Samsung Captivate is a very old device but you can still install Android KitKat on it via the CM 11 custom ROM. It is still in development but it can be used for day to day purposes. Follow the guide below to install CM 11 on Samsung Captivate.