Excalidraw

Love it. It isn't the most polished app ever, but it's end-to-end encryption and ease of use make it awesome.

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

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

Amazing tool when it comes to representing any kind of information!

it works great and it's cool!

The design is straightforward and user-friendly, with a carefully curated selection of styles and fonts that prevents overwhelming users. The inclusion of libraries is a fantastic addition！

Great for moodboards or game design, it has great integration with Obsidian

It is very easy to use, fast, good use of the canvas, and I love the hot keys which make Exalidraw much better compared to its competitors. Just waiting for some standard icons that can be imported that will be useful in system design interviews.

An amazing tool for really anybody!