One site, two halves
Seneca Commons pairs two things that don't usually sit together: free financial calculators, and Sentinel, a live dashboard tracking the structural indicators that precede social rupture. Same site, different tools, same underlying reason — clarity, whether the question is "what will my take-home pay be" or "how fragile does the system look this week."
The name comes from Seneca, the Stoic philosopher who wrote that ruin is rapid — growth builds slowly, collapse arrives fast. "Age of Discord," the phrase on the homepage, names Peter Turchin's term for a period like this one: rising elite competition and falling living standards moving together, the pattern his structural-demographic theory tracks across centuries of historical data.
Free, no login, no paywall. Prediction-market math (implied probability, Kelly sizing) and personal finance (retirement, payroll, salary, SIP), several built for India-specific tax and compliance rules.
Browse Tools →Seven panels, weekly composite score, all built on live public data — FRED, USGS, RSS newswires — grounded in James Greathouse's own structural-demographic framework, not commentary or prediction.
Open Sentinel →The framework and the sourcing live in Books — the two works this project is grounded in, plus the reading that shaped it.