What FRELUX does, how the numbers are produced, and what it will never pretend to know.
Using FRELUX. 5 questions answered below, each with the arithmetic behind it and the limits of what the tool decides. Open the Using FRELUX tool.
FRELUX is a set of construction calculators that measure materials, a quote layer that turns those measurements into an offer, and a property intelligence layer that reads documents and plans. The thing that ties them together is a rule: the AI reads, the engine calculates. Nothing on the site guesses a quantity from a description when it can measure it from a dimension. That rule explains most of the behaviour a new user notices. Prices come from the market you select or from a figure you enter. Tax is reported as undetermined rather than applied as a default. A blank input produces a gap rather than a typical value. Every one of those is the same decision seen from a different angle: a number you can check is worth more than a number you cannot.
Take a wall of twenty metres by two point four, with four openings, priced in a market with a verified block price and no configured tax rule. The estimate returns the blocks, the mortar, the cement in the bag size that market sells, and a total that says tax is not determined. Change the market to one without a verified block price and the tool asks you for the block price instead of substituting another country's figure. Two behaviours, one rule: nothing is assumed on your behalf that you would not want assumed in a tender.
The calculators are free to use, and no account is needed to measure a quantity or read an answer page. An account is what carries the work: saved estimates, quotes with their states, and the client side of a quote. Measuring is free because a quantity should never be behind a paywall; keeping a pipeline of quotes and their history is the part that costs money to run.
No. You can open any calculator, enter dimensions and read the result without one. An account is needed when you want to keep the estimate, send it as a quote, or come back to it later. The distinction is deliberate: a visitor checking how many blocks a wall needs should not have to register to find out, and a contractor running a pipeline needs the records an account provides.
The quantity is as accurate as the dimensions you enter, and the arithmetic on top of them is exact. Where the answer is less certain, the page says why: a coverage rate is a property of a product you select, a price comes from a market book or from you, and a tax line is left undetermined rather than assumed. So the honest answer is that the measurement is reliable, the inputs are yours, and the places where an assumption would otherwise sit are visible.
Either from the price book of the market you select, or from a figure you enter. Where a market has a verified book, the tool uses it and the line can be traced to it. Where it does not, the tool asks for the price rather than falling back to another country's number, because a labour or material rate imported from a different market is a fiction with a decimal point. The same rule applies to steel, where no default exists at all.
Because applying a percentage that is not the rate for your jurisdiction would produce a confident wrong number, and a wrong number is worse than a stated gap. Where a tax rule is configured for your market, it appears as a line with its basis shown. Where none is configured, the estimate says tax is not determined. You can then add the rate that applies to you, and the total carries it as your figure rather than as the tool's assumption.