Normality screen for a sample: skewness, excess kurtosis, Jarque-Bera test with p-value, and the 68-95-99.7 rule check.

Paired t-test on before and after data: mean change, t, degrees of freedom, p-value, confidence interval and Cohen dz.

Sample size for a two-sample, one-sample or paired t-test from effect size, alpha and power; or the power for a given size.

Convert text or bytes to and from binary, octal, hex, decimal, Base32 (RFC 4648), Base58 (Bitcoin) and Base64.

Morse code encode or decode (ITU-R M.1677) with dot/dash timing in units and milliseconds at a chosen words per minute.

Spell text in the NATO phonetic alphabet (Alfa, Bravo, Charlie) or decode NATO words back to letters and digits.

A1Z26 (A=1) and Polybius square number ciphers, both ways, with optional keyword square and ADFGX labels.

Playfair cipher encode or decode with a keyword; shows the 5x5 square and the digraphs. I and J are merged.

Vigenere cipher encode or decode with a key, or estimate the key length of a ciphertext by index of coincidence.

CVEs CISA added to the Known Exploited Vulnerabilities catalog in the last 1-90 days, newest first, with vendor and product.

Exploited-vulnerability record of a vendor in CISA KEV: total CVEs, products, ransomware use and latest additions.

Cosine similarity of the word-count vectors of two texts, with shared terms and vector norms.

Levenshtein and Damerau-Levenshtein edit distance (restricted and unrestricted) between two texts, with a 0 to 1 similarity.

Rank up to 50 candidates against a query by Jaro-Winkler, Levenshtein, Dice or cosine, best first, with scores.

Hamming distance between two equal-length strings (text or binary), with the differing positions. Unequal lengths are undefined.

Jaro and Jaro-Winkler similarity of two short strings (names), with matches, transpositions and prefix boost.

Longest common subsequence and longest common substring of two texts, with their lengths and a 0 to 1 ratio.

Original Metaphone (Philips 1990, not Double) phonetic key of an English word, with optional second word to compare.

Dice and Jaccard n-gram overlap of two texts by character or word, as sets and as multisets.

American Soundex code of a name (R163 for Robert), with an optional second name to test whether they sound alike.