jStock is a tool for technical analysis of stocks. It draws logarithmic charts (candlesticks) based on daily open, high, low, and close for a stock. Both daily and weekly charts are supported, as is volume and a few technical indicators. Data files can be fetched from the Internet and from downloaded files. Notes and user-drawn
lines are stored in an (optional) database. Important design parameters have been to maximise the area for the candlestick chart and minimise the user interactions for daily use.