The newest Toolcore batch adds another hundred browser-local pages in correlation and finance math, classical ciphers and readability scores, JWT display-only decode, Gray code and Base58Check, SPF/DMARC and HTTP header splits, calendar week math, and check-digit generators for retail barcodes. Use this map when you know the job—not when you want to scroll the full catalog.
Correlation, regression, and finance
- Spearman rank correlation, R², and sample covariance — relationship strength from two pasted number lists.
- Compound interest, Loan payment, and break-even units — quick finance homework without a spreadsheet.
- 2D distance, midpoint, and Monte Carlo π demo — geometry and simulation-lite drills.
Ciphers, readability, and run-length text
Classical ciphers and readability formulas run locally on pasted prose—no upload, no server round-trip.
- Tap code encode, pigpen cipher, and Caesar all shifts — puzzle and classroom cipher work.
- SMOG index, Gunning fog, and run-length compress — readability scores and lightweight text transforms.
JWT decode, checksums, Gray code
- JWT header decode and payload decode — display JSON only; no signature verification.
- Hamming weight, CRC-16/CCITT, and entropy bits per character — bit counts and Shannon entropy on pasted text.
- Gray code encode, Base58Check decode, and PEM body only — binary-friendly encoding helpers adjacent to the Encoding hub.
Email auth headers, calendar math, check digits
- SPF record parse, DMARC parse, and Cache-Control split — deliverability and CDN debugging from pasted headers.
- ISO week of year, days until date, and fiscal quarter start — calendar planning without leaving the browser.
- UPC-A check digit, EAN-13 check digit, and Luhn check digit generator — retail and payment identifier format checks (no live directory lookup).
Browse Math, Writing, Security, Encoding, Protocol, Schedule, and Identity tabs on the home catalog for the full list. For the prior statistics batch, see the statistics and text analysis guide.