Albert Cheng has led growth at three of the most successful consumer freemium subscription products in the world -- Duolingo, Grammarly, and Chess.com -- giving him unmatched pattern recognition for how to convert free users to paid subscribers at massive scale. Their core argument: Freemium wins when you instrument the conversion journey precisely and let your free tier showcase your best product.
The evidence is specific: Grammarly: Interspersing paid suggestions (tone, clarity, rewrites) among free corrections nearly doubled upgrade rates. Furthermore, duolingo: All learning content free, monetizes only additional features (no ads, unlimited health), creating a word-of-mouth growth loop. Chess.com: Mission-driven free product with premium game modes and features that convert based on engagement depth.
In Albert Cheng's own words: "Grammarly is a freemium business model, which means that over 90% of our users are on the free service and the rest of it pay for subscriptions essentially. And so one of the teams, they work on subscriber conversion." (Describing Grammarly's freemium economics and the team focused on free-to-paid conversion.)