Search a whole text and replace every hit. Literal or regular expression, match-case and whole-word toggles, $1 capture-group replacement, a live match count and a context list of each match. REGEX CAPTURE GROUPS BATCH
Shuffle, unscramble or anagram any text: seeded reproducible shuffles, a solve button, and a check of which words are real English.
Spot the AI tells in a draft and auto-fix the safe ones. Scores human-likeness.
Turn a rough ask into a structured prompt with role, task, format, length and rules.
Capitals, spacing, common misspellings, a/an and missing full stops - with a change log.
Pipe flow from ID and velocity, or solved from a pressure drop and length with an iterated Colebrook-White friction factor alongside the explicit Swamee-Jain and Haaland approximations and the gap between them. Separates laminar, transition and turbulent regimes and says where the equations stop being reliable.
Independent, paired and one-sample t-tests from real summary statistics: the t statistic, degrees of freedom, p-value and a verdict at alpha 0.05.
Push uncertainties through any formula step by step, in quadrature or worst case, with partial derivatives and a relative or absolute output error.
Length, area and volume change with temperature for any material, plus the fixed-length gap a joint needs to stay sealed from cold to hot.
