The Setup That Broke on Day 3
I built a simple portfolio tracker to monitor ~15 tech stocks and a few ETFs. Nothing fancy — just daily price updates, percent change calculations, and basic dividend tracking. Used the mobile apps for Yahoo Finance, Google Finance (via the Stocks widget), and Seeking Alpha's free tier.
Everything worked fine until I added international stocks (TSM, ASML). Yahoo started showing delayed quotes for ASML without warning. Google's widget refused to track TSM under its Taiwan ticker and forced me to use the OTC version (TSMCY), which has completely different liquidity. Seeking Alpha showed both... but only in the web interface, not the app.
That's when I realized these aren't just "different UIs for the same data." They pull from different sources, handle international markets inconsistently, and make different assumptions about what counts as "real-time."
Data Freshness: Who Updates When
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