Astro.CafeAstrology.com offers free astrology compatibility charts, as of 2015. AstroMatrix.org offers a free relationship compatibility report. The website prompts to enter the dates of birth of two people and then provides a compatibility report.
Find a free compatibility chart on CafeAstrology.com by clicking Compatibility for Lovers on the home page, clicking Love Sign Compatibility on the next page and then clicking a Zodiac sign.
Find a relationship compatibility report on AstroMatrix.org by clicking Relationship Compatibility under the Free Horoscope heading on the home page. On the next page, enter the birth dates and bith places of two people, and then click Calculate Horoscope.