When designing a new system, tracking every interaction between components can be a nightmare. That’s why sequence diagrams are essential for illustrating how objects or components interact over time, making complex systems easier to understand for developers, analysts, and stakeholders alike. But with so many tools available, from intuitive drag-and-drop editors to text-based generators, choosing the right one can be overwhelming. In this guide, we break down the top sequence diagram tools, comparing their features, collaboration capabilities, templates, and export options, so you can pick the perfect tool for your workflow.