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Where Chart Library fits in your stack.
Most other finance tools are complements to Chart Library, not competitors. These pages clarify the boundaries and when each fits.
Chart Library vs Polygon →
Polygon = market data infrastructure. Chart Library = cohort intelligence layer on top. They're complements, not competitors. Most production stacks use both.
Chart Library vs yfinance →
yfinance is fine for hobby projects. Three structural problems disqualify it for production: survivorship bias, no analysis layer, unofficial-scrape fragility.
Chart Library vs TrendSpider →
TrendSpider names the chart pattern. Chart Library tells you what the cohort of historical analogs to that exact pattern actually did next.