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Corrections

This page lists corrections that changed an answer or a piece of information on the site, with the day the correction went live, newest first. Small changes of wording are not listed. The list starts in October 2026.

If you find a mistake, write to quaestio.application@gmail.com. How mistakes are corrected is described on the How the content is made page.

  • . Graphing calculator: long numbers on the x-axis ran into each other. Fewer labels, evenly spaced, are now shown when they do not all fit, and the grid stays in place.
  • . Graphing calculator: long numbers on the axes were cut off at the edge of the graph, on the left of the y-axis and on the right of the x-axis. They are now shown in full.
  • . Regex tester: the Capitalised word example missed words starting with a letter outside a–z, such as Ș and É.
  • . Regex tester: the Repeated word example did not find the doubled word in the sample text in Italian, Polish and Spanish, where the words have letters outside a–z. In Romanian the sample text had no doubled word.
  • . Electricity cost calculator: the share of energy lost when charging an electric car was given as about a tenth, without a source. It now says around 16% on average, with sources.
  • . Calculator and graphing calculator in English and Mexican Spanish: 1,000 was read as the number 1, because the comma was taken as a decimal point. A comma followed by exactly three digits is now read as a thousands separator, so 1,000 + 1 gives one thousand and one.
  • . Regex tester: the number in the sample text was written with a thousands separator, so the Number example read it as two numbers or as a number with decimals. The number is now 450.
  • . Working days: the text said that counting both the first and the last day is the usual practice in contracts. That does not match the law. The text now gives the country’s rule for counting deadlines, with the provision.
  • . Countdown, public holidays and working days: the date of Easter was described with an astronomical rule. The dates were right, but the rule is the church’s: Easter Sunday is the Sunday after the first ecclesiastical full moon on or after the spring equinox, which the church fixes at 21 March.
  • . Readability index: the note on the scale said in several languages that it applies to Nordic texts. The scale is set on Swedish text and is only a guide for other languages.
  • . Historical exchange rates: the text said that the European Central Bank’s reference rates are set at 4pm. They are agreed at around 2:10pm and published at around 4pm, Central European Time.
  • . Take-home pay in Italian: the calculator accepted a municipal income tax surcharge of up to 5%. The limit is now 1.2%, the highest rate the Italian Ministry of Economy and Finance lists for a municipality.
  • . VAT in Italian: the text said that household gas carries 10% VAT. That applies only to the first 480 cubic metres a year; above that the rate is 22%.
  • . Index-linking in Romanian: the example used an index value that is not in the series. It now uses the series’ own values for December 2025 and July 2026.