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On the Duo: Duo-native. Version 46.11.0 (22 October) added iPhone Duo support, its release notes say; Cisco hasn't shown the Duo layout. Checked November 5, 2026.
App Store data as of November 5, 2026

People looking for a personal chat app will find it built around workplace spaces, meetings and Webex devices.
Webex is Cisco's app for continuous teamwork. You create spaces with one person or a project group to message, share files and whiteboard, and start or join HD video meetings with screen sharing; calling is built in. Integrations and bots bring updates from apps such as Box and Salesforce, and one search finds people, messages and files across all your spaces. The app can pair with Webex devices such as the Webex Board to control meetings wirelessly and save whiteboard drawings. Cisco says it is built with end-to-end encryption, and the latest version previews Markdown files natively.
Version 46.11.0 (22 October) added support for iPhone Duo, its release notes say. Cisco hasn't shown the Duo layout, so the picture here is its iPad layout.