Question: I need a conversational AI that can sync across devices and offer versatile roles for different conversations.

If you're looking for a conversational AI that spans devices and has flexible roles for different conversations, AI Chat PowerBrain Assistant & AI Chatbot is a good choice. This AI system uses ChatGPT and GPT-4 for immediate responses, task automation and multilingual support. It has cross-platform sync, personalized experiences and content generation. It's notable for a free plan that provides limited access, so it's more accessible to a broader population.

Another strong contender is CamelAGI. It lets you build autonomous agents that can hold real-time conversations about a particular subject. CamelAGI marries BabyAGI's loop architecture with AutoGPT's role-playing interface, and it's well suited to domains like conversational AI, game worlds, education and business decision-support. It's got heavy-duty technology and an interface that makes it easy to automate tasks.

If you want a more collaborative experience, Voiceflow could be the way to go. It's a service for building, deploying and scaling chat and voice AI agents. Voiceflow integrates with other services like CRM systems, SMS services and e-commerce sites. It's got a visual drag-and-drop interface for multi-step workflows, and different pricing levels for different needs.

If you want a service that integrates with tools like Slack and Google Docs, Parallel AI could be very useful. It has access to a variety of AI models, including GPT4, Gemini and Claude 3, with features like Long-Term Memory and AI Knowledge Base. It's geared for productivity and automating business processes, and has flexible pricing for individuals and businesses.