Cryptlex might be a bit more popular than Sketchboard.io. We know about 1 link to it since March 2021 and only 1 link to Sketchboard.io. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Miro or sketchboard have pretty decent tools for designing your digital whiteboard and creating flowcharts. While still being quite easy to use (and therefore fast to get your ideas out). Source: about 3 years ago
Since we're on the topic, I would highly recommend https://cryptlex.com/. - Source: Hacker News / about 1 year ago
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