The best Diagram Editor alternative to OpenBoard Whiteboard is Excalidraw, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to OpenBoard Whiteboard and seven of them are Diagram Editors so hopefully you can find a suitable replacement. Other interesting Diagram Editor alternatives to OpenBoard Whiteboard are Miro, LimanDoc, Lorien and Vani.
Excalidraw is an open-source whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them. Available directly online as a web app and also through CodeSandbox to easily see how the code works, and the app is available for self-hosting.
A secure collaboration platform for distributed teams offering real-time and asynchronous capabilities, infinite canvas, integrations with major tools like Google Suite, Slack, and Dropbox, and features for enhanced product development and design workflows.
LimanDoc is a simple yet powerful tool for visualize files, diagrams, and construct a mind map with the possibility to edit Markdown text. It is an offline first desktop app with a 2D canvas that allows a preview of the inner folders (boards).
Lorien is an infinite canvas drawing/note-taking app that is focused on performance, small savefiles and simplicity. It's not based on bitmap images like Krita, Gimp or Photoshop; it rather saves brush strokes as a collection of points and renders them at runtime (kind of...
Vani is a visual collaboration platform where teams create, meet, and work together over a shared infinite canvas.
Moredraw is a thought recording whiteboard with multiple types of nodes built in, including flowcharts, mind maps, pictures, notes, videos, to-do lists, charts, etc. Any node can be linked to help you organize your thoughts.
Drawy is a work-in-progress infinite whiteboard tool, which aims to be a native desktop alternative to the amazing web-based Excalidraw.
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It does not have any same feature. One of them I will tell. OpenBoard has a feature which enables us to sketch both on whiteboard and open space but it does not.