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The rebrand had a prequel. In December 2018 Duolingo redrew Duo in-house, simplifying him into geometric shapes so he could be animated and given a range of emotions; art director Gregory Hartman told Design Week the app had been running two art styles that did not mesh. Co-founder Luis von Ahn told The Verge the change opened a Pandora's box across roughly 200 screens, and the team had A/B tested how many tears the crying owl in reminder emails should shed. The owl's colour, von Ahn added, began as a joke on a co-founder who hated green.

By 2019 Duolingo's pieces mostly worked inside the app: Duo the green owl, the core colours and the illustration style. What it lacked, according to the design team, were rules for using them anywhere else, and a logo that reflected a mission staff were united on, that free teaching in over 30 languages can change lives.

The fix began with type. Rather than pair the owl with the neutral sans serif every tech company uses, the team drew the logotype from Duo's feathery form, with serif flecks taken from his plumage. That grew into a full bespoke typeface, Feather Bold, with quirks such as a flicked lowercase g used sparingly. Duo himself was simplified to make him easier to animate, and a close crop of his beaky face became the app icon, cementing the link with mobile games. Logo lock-ups, colours, type styling and illustration guides followed.

Design Week and Creative Bloq both credit the London consultancy Johnson Banks, with type specialist Fontsmith drawing Feather Bold. Founder Michael Johnson said Duolingo had never found a viable way to set its name next to Duo, and that the first attempts at a feathered typeface looked bonkers. The idea at the centre was that everyone can Duolingo, for an app then claiming 300 million users.

Creative Bloq noted how much the cartoonish refresh made the platform feel like a game rather than a lesson. That is the point. The owl was always the asset, and this is the rebrand that made everything else, letters included, look like it belonged to him.

Meanwhile the owl became a meme. Vice described the internet's version of Duo as a ruthless sociopath with nothing to lose. The rebrand gave that character a matching voice in type.