Sawtooth Software 2020 European Conference | Virtual Attendance  | September 22–25
Early-bird pricing ends August 22!

Download Ci3

Ci3 is a legacy CAPI interviewing program. It is no longer sold and supported, and is not compatible with 64-bit operating systems.

Latest Version

Ci3 Version 2.6.16

30 May 2007


Ci3 is legacy Windows-based CAPI interviewing program. Note to Windows Vista users: Vista no longer supports the WinHelp files used in Ci3 by default. In order to view help in Ci3, please download the WinHelp program from Microsoft (

If you are installing the product for the first time on your computer, skip to STEP 2. Users of SMRT should also update to the latest version.

  1. Uninstall Previous Versions. Uninstall your old version using the "Add/Remove Programs" feature found in the Windows Control Panel. This will not remove or alter any of your existing survey files. Note: This version no longer supports Windows 95/98. If you are unable to upgrade your operating system please use a previous version available from the Old Versions tab.


  2. Download Program. [13.9 MB]
  3. Launch Installation Program. If you have chosen to run the installation program from its current location, the installation process will start automatically. Otherwise, you will need to manually launch the installation program.


  4. Enter User ID Information. At the end of the installation process, you will need to import your .userid file that was included in your software purchase email. If you do not have a UserID file please contact This email address is being protected from spambots. You need JavaScript enabled to view it. for a replacement UserID.


Sawtooth Software

6:30 AM to 5:30 PM Mountain Time
(GMT-6; GMT-7 Autumn/Winter)
Monday through Friday

Phone: +1 801 477 4700
Fax: +1 801 337 7410

SKIM Software

9:00 AM to 5:30 PM Central European
(GMT+2; GMT+1 Autumn/Winter)
Monday through Friday

Phone: +31 10 282 3500
Fax: +31 10 282 3560

Lighthouse Studio

Lighthouse Studio is our flagship software for producing and analyzing online and offline surveys. It contains modules for general interviewing, choice-based conjoint, adaptive choice-based conjoint, adaptive choice analysis, choice-value analysis, and maxdiff exercises.

Try Lighthouse Studio

  Buy Lighthouse Studio