Excalidraw

Perfect for creating diagrams, user flows, charts and using it as a whiteboard, works perfectly on tabs and desktops as well. Loved its dark mode and library is another great addition. Free version is just fine but I'd recommend going to Upgraded version, worth paying

"A clean interface that sparks creativity. Easy-to-create diagrams for presentations and sharing ideas."

Clean, easy to use, and the minimal set of styles / fonts is just perfect to not overwhelm the user. Libraries are a very welcome feature.

"I invested with a dubious broker, losing access to my funds. Thankfully, (ERIB.IO) expertly tracked and recovered my stolen assets, restoring my financial security."

I love how easy it is to get started + the distraction free interface. Makes it really easy to focus on ideas rather than trying to navigate the tool.