Co-parenting apps are widely considered the most effective communication tool for parallel parenting. OurFamilyWizard is one of the most established options, offering shared calendars, expense tracking, and a messaging system that creates a documented record of all communication. Some courts even order the use of a co-parenting app as part of the custody agreement. Other options include Talking Parents and AppClose, which offer similar features. The documentation these tools provide can also be valuable if disputes ever return to court.