Tech Terminal

Big tech stocks on a trading-terminal board: amber on black, a ticker tape, a command line, function keys, sparklines and 1D / 5D / 1M / 1Y charts. Inspired by trading terminals; not affiliated with any.

Live: https://techterminal.vercel.app

Default watchlist: NVDA, AAPL, MSFT, GOOGL, AMZN, META, AVGO, TSM (TSMC ADR), SKHY (SK hynix ADR), TSLA, SPCX (SpaceX), ORCL, plus SPY and QQQ for the S&P 500 and Nasdaq-100. Add or remove tickers from the command line; your list is saved in your browser.

Where the data comes from

• Without a key: quotes, charts and volume come from Yahoo Finance's chart data, through a small Vercel function (api/yahoo.mjs) that caches responses at the edge (60 s for quotes, up to an hour for daily charts). It's an unofficial source and can change or be rate-limited without notice.
• With your own Finnhub key: press F6 (or type KEY) and paste a free key from finnhub.io. Quotes and market caps then come from Finnhub, called straight from your browser. The key is kept only in that tab's memory: it isn't saved (no localStorage, cookies or server), isn't sent to this site, and is forgotten when you reload. To stop using it sooner, press F6 → USE YAHOO or type KEY OFF.

The site sends a strict Content-Security-Policy (vercel.json): the page may only run its own scripts and may only send data to itself and finnhub.io, so even a bug couldn't send a key anywhere else. Charts and volume still come from Yahoo, because Finnhub's free plan has no price history; non-US listings (like 000660.KS) always do.

Not investment advice.

Commands

Type	Does
AAPL ⏎ or AAPL <GO>	Show a ticker; add it to the watchlist if it's new (HYNIX, SPACEX, TSMC work too)
DEL AAPL	Remove it
1D 5D 1M 1Y	Chart range
SORT PCT	Sort by PCT, CHG, LAST, VOL, MCAP (with a key) or SYM
KEY · KEY OFF · HELP · RESET	Finnhub key · forget the key · help · default watchlist

Keys: F1 help · F2 sort · F3 range · F4 add · F5 refresh · F6 Finnhub key · / command line · ↑ ↓ move through the list. On phones the function keys are buttons along the bottom.

Develop

No dependencies; Node 20+.

npm run dev                 # http://localhost:3000 (serves public/ and /api/yahoo)
npm i --no-save [email protected]
npm run brand               # favicon set + share image (screenshot of the running app; needs Chrome)

public/        the page: index.html, app.js, style.css, fonts, icons
api/yahoo.mjs  Vercel function → lib/yahoo.mjs (Yahoo chart data, validated and cached)
scripts/       local dev server and the brand script

Vercel serves public/ as static files and api/ as functions (vercel.json), with Vercel Web Analytics.

License

MIT. Fonts: IBM Plex Mono (SIL Open Font License).