Concepts

The ideas behind the app, explained without jargon.

• Cost basisCost basis is what a position actually cost you. It is the anchor every return figure is measured from, which is why a wrong cost basis quietly corrupts everything else.
• Average costAverage cost is what you paid per unit, across every purchase. It is the number to compare against the current price to see where a position stands.
• Unrealised and realised returnUnrealised return is the gain still sitting in a position you hold. Realised return is what you locked in by selling. The holdings table shows both, and they answer different questions.
• Time-weighted vs money-weighted returnTwo honest ways to answer "what did I make", giving different numbers. One measures the investments, the other measures your timing. Here is which is which.
• Position weightWeight is what share of the portfolio a single holding represents. It is how concentration becomes visible, and it responds to your filter.
• Holding periodHolding period is how long you have owned a position, or how long you owned one you have sold. It is the context that turns a return percentage into a rate.
• Dividend yieldYield is the income a position pays relative to what it is worth today. It moves when the price moves, which is why a rising yield is not always good news.
• Yield on costYield on cost divides today's income by what you originally paid. It is a satisfying number and a poor basis for decisions, and it is worth knowing why.
• Thirty-day moveThe 30-day column is a short-term momentum read: how a position's price has changed over the last month. Useful for spotting what moved, misleading as a signal.
• How net worth history worksToday's figure is computed live, earlier days come from daily snapshots, and anything with a market price is revalued as you look at it. That mix explains most of what looks surprising on the chart.
• How your assets are pricedSome things Gylder prices for you every day, some it never will, and the line between them is whether it can convert what you hold into something with a market price.
• BenchmarksFour indices to measure your portfolio against, and why the choice matters more than it looks. Beta, alpha and the capture ratios are all relative to whichever one you picked.