ValueScreener
ValueScreener is a value investing stock screener and thesis monitoring tool for people who pick their own stocks. The screener runs 30+ documented disciplines against every company we track, so you find candidates passing a named strategy, not a generic stock information screen. Every stock page shows sourced figures on whether a company is cheap, good and safe, ranked against peers.
Once you own a stock, write down why: the numbers that must stay true, as guardrails like "operating margin stays above 12%." Every night, guardrails and any saved screen are re-tested against the newest filings. Most nights nothing changes, so you hear nothing. The first night a guardrail breaks or a company enters/leaves a screen, you get one email with the arithmetic and filing behind it.