EvenOddLab is a small collection of focused tools about one of the oldest ideas in arithmetic: whether a number is even or odd. We built it because most “even or odd checkers” give a one-word answer and break on zero, negatives or long numbers.
What we care about
- Exact answers. Numbers are processed as exact integers, never rounded through floating-point arithmetic, so a 300-digit input is checked as precisely as 7.
- Explanations, not just labels. Every result shows the division or factorisation behind it.
- Privacy. Calculations run in your browser. We do not ask for accounts and do not store the numbers you enter.
- Accessibility. All tools work with a keyboard and screen readers, and never rely on colour alone.
Who it is for
Students checking homework, teachers preparing exercises, parents helping with maths practice, and developers who need test data or a quick sanity check.
Corrections
If you spot an error in a result or an explanation, please tell us via the contact page. Accuracy is the whole point of the site.