Coco is an AI assistant that lives inside WhatsApp and Telegram, managing reminders, lists, and calendars through natural conversation. It helps users stop forgetting tasks by allowing them to speak or type requests like 'Remind me to send the report today before 4 PM' or 'Block Friday 2-3 PM as Deep Work and invite Sarah.' Coco learns user preferences, syncs with Google and Outlook calendars, and can send reminders to friends. It offers unlimited reminders, calendar management, internet research, and daily briefings. Pricing starts free with limited features, with paid plans for more capabilities.