Miro is a powerful online whiteboard that allows for unlimited canvas, collaboration features, and the ability to attach files. It's great for turning ideas into tasks and has integrations with various apps. Stormboard is a sticky note-style ideation tool that handles brainstorming sessions well, with features like substorms and StormAI. Mural is an easy-to-use online whiteboard ideal for big remote team meetings, with templates and customizable permissions. FigJam is a great collaboration tool for designers using Figma, with integrations and AI-powered features. The best online whiteboards are Miro, Stormboard, Mural, and FigJam, each offering unique features and benefits for different use cases.