After the couple’s divorce, their communications shifted to a platform called OurFamilyWizard, used by hundreds of thousands of parents in the United States and abroad to exchange messages, share calendars, track expenses. (OFW keeps a time-stamped, court-admissible record of everything.) Kennedy paid extra for an add-on called ToneMeter, which OFW touted at the time as “emotional spellcheck.” As you drafted a message, its software would conduct a basic sentiment analysis, flagging language that could be “concerning,” “aggressive,” “upsetting,” “demeaning,” and so on. But there was a problem, Kennedy says: His co-parent didn’t seem to be using her ToneMeter.