What do the colours on a heat map mean?

Green means the asset is up, red means it's down, and a deeper shade means a larger move. It's a fast way to read the day's winners and losers.

What does tile size represent?

Market weight — bigger companies (or bigger index weights) get bigger tiles, so the map reflects what actually drives the index.

What heat maps does Oswol offer?

Five: NASDAQ-100, sector ETFs, broad ETFs, crypto and your own watchlist — each tile clickable for an AI explanation.

What is a market heat map and how to read one

A heat map turns the whole market into one glance — size by weight, colour by move. Here's how to read sector rotation, breadth and crowding in seconds.

A market heat map compresses hundreds of tickers into a single picture you can read in seconds. Instead of scrolling a watchlist, you see the entire market's shape at once — what's leading, what's lagging, and where the money is rotating.

Size by weight, colour by move

Each tile is a stock or sector. Its size reflects market weight (a mega-cap tile dwarfs a small-cap), and its colour reflects the move — green up, red down, deeper shade for bigger swings. One look tells you whether today is broad or narrow.

Reading rotation and breadth

If one sector is bright green while the rest are pale, that's rotation — money concentrating. If almost everything is green, that's healthy breadth. A market propped up by two giant tiles while everything else is red is narrow — and fragile.

Five views, one click

Oswol offers heat maps for the NASDAQ-100, sector ETFs, broad ETFs, crypto and your watchlist. Click any tile for the AI explanation of why it moved.

A heat map shows what moved, not why. Pair it with the explanation before drawing conclusions.