What you see
A grid of tiles, one per stock. Tile size is proportional to market cap. Tile colour is the stock's return — green for positive, red for negative, with intensity scaling to the magnitude. Tiles are grouped by sector.
In one glance: which sectors are green, which are red, and which large-cap names are driving the moves.
What the heatmap is good at
Sector-level read
If half the screen is green and most of the green is concentrated in IT and Banks, the market is on those two sectors today. If the green is spread evenly across all sectors, it's a broad-based day.
Outlier spotting
A bright-green small tile inside an otherwise red sector — that's a stock-specific move worth investigating. A bright-red large tile inside a green sector — same.
Day-vs-period comparison
The window selector at the top of the heatmap (1D / 1W / 1M / 3M / 1Y) lets you switch the colouring. A stock that's green on 1D but red on 1M is a stock that bounced today after a tough month. The visual is faster than scanning a spreadsheet.
What it isn't good at
- Small-cap and SME — the tiles are too small to read individual symbols. Use the screener instead.
- Numerical precision — the colour intensity is logarithmic by design. A pale-green tile isn't the same as +2.5%; it's "modestly positive". For exact numbers, click through to the stock.
- Trend over time — you see one window at a time. For multi-window comparison, switch to the sectors page.
Interacting with the heatmap
Click any tile to jump to that stock's detail page. Hover (on desktop) shows the exact return and market cap. The sort/filter dropdown lets you switch the colour metric from "return" to "volume change" or "delivery percentage" — useful for finding stocks with unusual activity that isn't reflected in price.
A useful daily ritual
After market close, open the heatmap on the 1D window. Spend 60 seconds scanning. Identify:
- Two sectors that led
- Two sectors that lagged
- One outlier stock in either direction
Write the four observations down (a sticky note works). Next morning, scan again — note what continued and what reversed. Over two weeks of this, you'll develop a fast intuition for market regime that no amount of reading produces.
Open the heatmap