Markets by MP

What it is

Markets shows my TSX and US stocks together, in Canadian dollars: live US prices, today’s change, total return, allocation and a chart of the whole portfolio. It installs on a phone or computer like a regular app, walks new users through getting a free data key, and keeps keys and holdings in the browser. Visitors without a key see a demo portfolio.

It started as a local Python and SQLite app, became a web app called Investing Tracker, and is now Markets by MP.

How it works

• Live US prices come from Finnhub’s free plan, about once a minute.
• Toronto prices and daily history come from Alpha Vantage, which allows 25 requests a day, so the app saves them and only asks when it needs to.
• The USD to CAD rate comes from Frankfurter, which needs no key.
• The maths (value, return, allocation and the portfolio chart) lives in one module with its own tests.
• Everything is saved in your own browser. Nothing goes to a server of mine.

How I’m building it

1. Test live US prices with a free Finnhub key.
2. Install it on my phone and check it works offline.
3. Open it up here once it’s ready.

How I build

I decide what each app should do, use AI coding tools to write the code faster, then review, test and fix each change.