Accessibility
This site targets WCAG 2.2 level AA. Where it falls short, the aim is to say so rather than claim otherwise.
What is implemented
Semantic HTML, a visible skip link, labelled form controls, visible focus indicators, keyboard operation for every control including the search combobox and language selector, contrast that meets AA for text, touch targets sized for use on a phone, and respect for the reduced-motion setting.
Results and screen readers
Results update as you type. Announcements are made when a calculation settles rather than on every keystroke, so a screen reader is not flooded while you are still entering a number.
Colour is never the only signal
Where a result distinguishes a calculated value from a planning allowance or a purchase recommendation, that distinction is carried by text labels as well as colour.
Reporting a problem
Accessibility defects are treated as real defects. If something here is unusable with your assistive technology, that is a bug worth fixing rather than a limitation to work around.