A Free Bloomberg for the Rest of Us

OpenStock gives you real-time stock data, price alerts, and company research across 30+ global exchanges — free, forever, no subscription required.

A tool people actually needed

If you've ever tried to keep a proper eye on the stock market — your own investments, a competitor's parent company, a supplier publicly listed overseas — you've probably bumped into a wall. The good tools are expensive. Bloomberg terminals run thousands of euros a year. Most alternatives are either clunky, ad-riddled, or missing the exchanges you actually care about.

OpenStock is a free, open-source project that covers more than 30 international stock exchanges: real-time prices, personalized alerts when a stock hits a threshold you set, and detailed company profiles. It looks clean and modern. You can run it yourself on your own server — meaning no one else has your data, no monthly bill, no plan upgrades.

It got 755 stars on GitHub in a single day. Within days, someone in India had already built a version focused entirely on the Indian stock exchange. That kind of reaction usually means the gap was real.

Who this is for

Anyone paying for a stock-data subscription who doesn't need the enterprise bells and whistles. A founder keeping an eye on industry players. A small investment club tired of patching together free tiers across five different sites.

Words worth knowing

Open-source — Software whose recipe is public. Anyone can inspect it, copy it, improve it, or adapt it for their own use. Free as in freedom, not just free as in price.

Self-hosted — Running a piece of software on your own computer or server instead of using someone else's cloud. You control the data. You control the costs.

GitHub — A website where developers share and collaborate on open-source software. When something trends there, it means thousands of developers noticed it in a single day.

Stock exchange — A marketplace where shares in public companies are bought and sold. There are dozens around the world; most paid tools only cover a handful.

If you're currently paying for market data you could describe as "good enough but expensive," it's worth spending ten minutes looking at what OpenStock actually covers: https://github.com/Open-Dev-Society/OpenStock