iPhone Duo launch apps: Slack, Yahoo! Transit, and Prime Video shine on day one

On the first day of iPhone Duo's release, several major apps, including Slack, Yahoo! Transit Guide, and Amazon Prime Video, are already optimized for the device's displays. This early compatibility impressed reviewers testing the new smartphone. Slack is fully optimized for the inner display, with the outer display also working well despite slightly narrower visuals. Yahoo! Transit Guide offers smooth route searches and results on both screens, while Amazon Prime Video effectively utilizes the device's right-side space. The reviewer expects more apps to adopt iPhone Duo optimization soon, potentially with App Store badges marking compatibility. This early wave of support suggests a promising start for the device's app ecosystem.