Texas is a strict non-disclosure state. Which means that data from sales are not automatically recorded in a public database. And because of this, data from some of these large property search sites are not nearly as accurate as they are in most other states. In order to get the most accurate and up-to-date information on active properties on the market, you are forced to obtain property information from a source directly affiliated with the mls providers.
Texas Ally has a very powerful property search tool available directly sourced from the Austin MLS for the Central Texas / Austin real estate markets. Come test it out for yourself.
For a more mobile-friendly search, try here.