"AI-first" tripled course output — and nearly cost Duolingo its users' trust
Duolingo · 2025–2026
What they did
In April 2025, Duolingo's CEO announced the company would go "AI-first," phasing out contract translators and content writers in favor of generative AI for course creation, and used it to launch 148 new language courses — more than doubling its prior catalog.
What happened
The announcement, not the technology, was the failure: it read as "we're replacing people with AI" and triggered a social-media backlash so sharp that users publicly pledged to delete the app. The CEO walked the framing back within months, clarifying no full-time staff layoffs were planned and that contractors would shift toward higher-judgment creative work rather than being eliminated. Despite the backlash, Duolingo beat quarterly revenue estimates and its stock rose roughly 30% on the results; by mid-2026 the company had further reversed AI-usage performance mandates as full-time hiring kept growing.
The so-what
The AI use here mostly worked — the course-generation output shipped and revenue held up. What nearly backfired was internal-facing language about replacing people reaching an external, trust-sensitive audience verbatim; the memo needed a different audience in mind before it went out.