Changes to the calculators

This page records what has changed in the calculators and whether results shift as a result. Recorded is what a user could notice: calculation method, the standard edition applied, corrections, new and removed features. Layout, wording and internal technology are deliberately left out — a list where the substantial change sits between trivialities helps no one.

Where a change shifts results, we additionally notify everyone who purchased the affected calculator by e-mail. No consent is required for this and none has been given: it is a contractual notice, not advertising.

The record starts when sales begin. Until then the collection is being built up and extended; there is no change service towards buyers yet, because there are no purchases yet. From the first sale onwards, every change a user could notice will be listed here without gaps.