Barcelona, 2025. A frustration shared by millions finally had a solution.
It started with a spreadsheet. Like most self-directed investors, our founders were managing portfolios spread across multiple brokers — some stocks here, some ETFs there, a bit of crypto on the side. Every Sunday evening meant the same ritual: exporting CSVs, copying numbers into formulas, trying to figure out if they were actually making money or just riding a bull market.
The tools available were either too simple (just a balance tracker) or too complex (built for professional fund managers). Nothing was designed for the growing class of serious individual investors who make their own decisions, hold positions for months or years, and genuinely want to improve.
But the real gap wasn't the data. It was the reflection. Why did you buy that stock? How were you feeling when you sold too early? Are you actually following your own rules, or just rationalizing in the moment?
No tool was asking those questions. So we built one.
Help everyday investors become better — not by telling them what to buy, but by helping them understand how they think.
We believe the biggest edge in investing isn't a hot tip or a better algorithm. It's self-awareness. Knowing that you consistently sell winners too early out of anxiety. Knowing that your best trades happen when you're calm and your worst when you're chasing. Knowing that you break your own rules 30% of the time — and those trades underperform by 2x.
That's the kind of insight that compounds over a lifetime. That's what StackViewer is built to surface.
Your portfolio data should be clear, honest, and yours. We show you the full picture — including the parts that are uncomfortable to look at.
We connect to your brokers read-only. We never touch your money, never execute trades, never store credentials. Your trust is not taken lightly.
We're not building a robo-advisor. We're building a mirror. The goal is to help you make slightly better decisions, consistently, over time. That's enough to change outcomes.
StackViewer never tells you what to buy or sell. We give you the data, the patterns, and the context. The judgment is always yours.
StackViewer is headquartered in Barcelona, Spain — a city that has always balanced creativity with rigor, and ambition with quality of life. We think that's a good mindset for building financial tools too.
We're a small, focused team. We don't believe in building fast and breaking things when it comes to people's financial data. We believe in building carefully, listening to our users, and shipping things that actually work.
If you want to get in touch, we'd love to hear from you.
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