DissoMaster was a computer program used by California family law attorneys, judges, and self-represented litigants to calculate guideline child support and temporary spousal support.

It was co-created by Art Grater and Stephen Adams and published under the CFLR (Center for Family Law Research) label in partnership with The Rutter Group, a Thomson Reuters business. The California Judicial Council certified DissoMaster annually under Family Code section 3830 and California Rule of Court 5.275 for use in court proceedings.

For over 30 years, DissoMaster was the dominant support calculator in California family law courts. The program applied the algebraic formula set forth in Family Code section 4055 to convert each party’s gross income into net disposable income and generate guideline support figures.

CFLR also developed companion tools, including Executioner (for wage assignments), Propertizer (for property division), and Pensioner (for retirement benefit analysis).

Art Grater retired from the DissoMaster development team in 2018. Thomson Reuters announced that it would discontinue DissoMaster and the entire DissoMaster Suite effective March 31, 2025. The Judicial Council declined to recertify the program for the certification year beginning April 1, 2025.

Thomson Reuters did not publicly explain its reasons for ending the product, though industry observers cited the shift to cloud-based platforms and the cost of maintaining legacy software.

Following the discontinuation, California courts transitioned to alternative certified calculators. XSpouse, which has been certified by the Judicial Council since 2001, became the primary replacement in most counties. Family Law Software, a cloud-based platform, also holds Judicial Council certification and offers child support, spousal support, and property division calculations.