I build these for my own quantitative work and for the people I work with. Each one runs entirely in your browser, so any file you load stays on your device. Some are password-protected.
Pick a breadth or sentiment signal, such as the NYSE A/D line going three months without a new high, and see what the S&P 500, Nasdaq, NYSE Composite or QQQ did afterwards, decade by decade. Password required.
More tools will be added here as they're ready.