EXHIBIT 23.1
 
               Consent of Ernst & Young LLP, Independent Auditors
   
  We consent to the reference to our firm under the captions "Selected
Financial Data" and "Experts" and to the use of our report on the COMPS.COM,
Inc. financial statements dated February 5, 1999 (except for Note 15, as to
which the date is April 12, 1999) and our report on the REALBID, LLC financial
statements dated February 17, 1999, in Amendment No. 5 to the Registration
Statement (Form S-1 No. 333-72901) and related Prospectus of COMPS.COM, Inc.
    
  Our audits also included the financial statement schedule of COMPS.COM, Inc.
for the three years ended December 31, 1998 listed in Item 16(b). This schedule
is the responsibility of the Company's management. Our responsibility is to
express an opinion based on our audits. In our opinion, the financial statement
schedule referred to above, when considered in relation to the basic financial
statements taken as a whole, presents fairly in all material respects the
information set forth therein.
 
                                          Ernst & Young LLP
 
San Diego, California
May 3, 1999