Crypto Bubbles is a free website and app that displays the crypto market as a field of coloured bubbles. Each bubble represents a coin; by default its size shows how much the price has moved over the selected period, and its colour shows the direction: green for gains, red for losses. That lets you see in seconds which coins are standing out. What the map does not show is whether a coin is good, large or cheap. This is precisely where most misunderstandings arise.

According to its own description, Crypto Bubbles covers the top 1,200 cryptocurrencies, with price, market capitalisation and performance. The site is available in German and 16 other languages. For investors it is therefore a quick gauge of market sentiment, but not an…