You don't need a calculator. You need a verdict.

A calculator gives you a number. A verdict gives you a decision. Each of these tools sets two realistic paths side by side — renting versus buying, paying off debt versus investing, and so on — funds both with the same money, and simulates them month by month or year by year. Then it compares where you end up: net worth for most of them, maturity value for the term-versus-endowment comparison, and the gap between what your family would need and what you have for the insurance one.

None of them is a single formula with a hidden answer. Every input is a slider you can move, the method is written out under each tool, and the tipping points are stated so you can see what would change the result.

Each result is labelled by how decisive it is, not by which side won. A clear verdict means the two paths end up at least 8% apart. A close call means they're within 8%, and the money alone doesn't settle it — the deciding factors are the ones no tool can measure, such as stability, flexibility and your comfort with risk. For insurance, a meaningful gap means the cover you'd need exceeds what you have by more than three times your annual income.

Which side wins is shown by its position on the scale, never by colour. The colour only tells you how confident the result is.

Every verdict turns on a small number of inputs, and the answer flips when they cross a tipping point. Paying off debt beats investing when the debt's interest rate is above your expected return. Buying beats renting when rent is high relative to the home's price, or when the home appreciates faster than invested money grows. Leasing beats buying when the lease is cheap or the car loses value quickly. Term-plus-investing beats an endowment when the market return is comfortably above what the endowment delivers.

That's why two people with different rates, rents or incomes can get opposite results from the same tool, and why it's worth testing your own numbers instead of trusting a rule of thumb.

These are planning models, not personal advice. They assume steady returns, leave out taxes and one-off costs unless a page says otherwise, and can't price things like the security of owning a home or the value of being debt-free. Use them to understand what drives a decision and to stress-test your assumptions, then confirm the details with a qualified adviser before committing large sums.