Exact tests, phonetic codes, and header parse tools

Another hundred tools landed across Fisher exact and distribution PMFs, phonetic and classical ciphers, SHA3 and JWT payload demos, Base85 and URI encoding, HTTP Accept and Content-Encoding parsers, calendar helpers, and VIN or GLN format checks—with twenty pages carrying extra SEO body blocks. Start here when you know the job, not the route name.

The latest Toolcore batch adds another hundred browser-local pages in exact and goodness-of-fit statistics, phonetic and classical ciphers, SHA3 and bcrypt demos, Base85 and URI encoding, HTTP Accept and Content-Encoding parsers, Easter and business-day calendar helpers, and VIN or GLN format checks. Twenty high-intent routes also ship thicker About/How SEO sections—listed first below.

Twenty pages with extra SEO body (start here)

Fisher exact test and goodness-of-fit chi-square — small-table and category-count statistics without a spreadsheet.
SHA3-256 demo, Keccak-256 demo, and bcrypt hash demo — compare digest shape against known vectors.
JWT payload decode, Playfair decode, and Soundex encode — token inspection and phonetic or cipher homework.
Accept header parse, Content-Encoding parse, and extract IPv4 addresses — split curl traces and pasted logs locally.
Base85 encode, slugify text, Easter date, and VIN format check — encoding, calendar, and identifier columns in one pass.

Distributions, matrices, and variance

Binomial PMF, Poisson PMF, and F-test variance — probability mass and variance comparison drills.
Eigenvalues 2×2, Quadratic roots, and Bayes theorem — linear algebra and belief-update homework.

Text cleanup, hashes, and headers

Normalize whitespace, Strip HTML tags, and Reading grade (lite) — draft cleanup before readability scoring.
Business days count, ISO week number, and GLN mod10 validate — schedule math beside identifier checksum pages.

Common use cases

Run Fisher exact or goodness-of-fit chi-square on pasted 2×2 or category counts before opening a stats package.
Decode JWT payload JSON or demo SHA3-256 hex on sample strings in the browser.
Parse Accept or Content-Encoding from a curl trace and count business days between calendar dates.

Common mistakes to avoid

Using demo digests as production verification
SHA3, Keccak, and bcrypt demo pages illustrate hash shape—they are not audited for side-channel resistance.
Treating VIN or GLN checks as registry lookup
Format pages confirm digit rules and checksums only—they do not query live manufacturer or GS1 databases.
Expecting Playfair to handle digits or punctuation
Classical cipher pages skip non-letters—normalize ciphertext before decode.

FAQ

How does this batch differ from the proportion z-test batch?

That guide covered proportion z-test, SHA-256 demo, and HTTP status line parse. This set adds Fisher exact and distribution PMFs, phonetic and Playfair ciphers, SHA3 and JWT payload decode, Accept header parse, and Easter or business-day calendar helpers—with 20 pages carrying extra SEO body blocks.

Which pages have extra SEO thickening?

Twenty high-intent tools—including Fisher exact, SHA3-256 demo, JWT payload decode, Accept header parse, and VIN format check—ship custom About/How sections via ToolPageSeoSupplement overrides.

Can agents prefill these tools?

Single text fields often accept q or qb. Multi-field number and date tools open without URL prefill.