DayClerk published a case study analyzing how Duolingo's AI-first hiring approach led to user backlash by publicly deleting multi-year learning streaks.

DayClerk is built around a single premise: behavioral simulation, the ability to model how a specific audience will think, feel, and act before a campaign launches. No other tool out there does this. And it is patent pending! From that simulation, we generate the campaign: landing page, email copy, social posts, each one calibrated to how that audience actually behaves, not how a generic template assumes they will. And once the campaign is live, the Page Optimizer and Daily Briefing keep it improving without requiring your daily attention. Who we are building for Our users are business owners who are exceptional at what they do and need a reliable operator handling the marketing side. The bakery owner perfecting a recipe. The retailer curating a seasonal collection. The agency principal managing five client relationships at once. The affiliate creator launching a new product partnership. The startup that has a beta product but no resources to market it. None of them have time to become marketing experts. None of them should have to.