The latest expansion on Toolcore adds a hundred browser-local pages across math, writing, security, encoding, protocol, schedule, and identity. You do not need to scan every new card—this map groups them by the task you already have in mind.
Loans, margins, and quick geometry
When a spreadsheet is overkill but you still want a formula you can trust, open one of these instead of retyping amortization by hand.
- Mortgage payment, EMI, and amortization schedule — principal, rate, and term in; monthly payment or a short schedule out.
- Margin, markup, discount, and ROI — retail and side-project pricing checks.
- Compound interest, standard deviation, and permutations nPr — homework, dashboards, and sampling math.
- Torus volume, annulus area, and quadratic roots — geometry and algebra without a CAS.
Case, ciphers, and similarity
Draft cleanup and fuzzy matching—useful when API names, slugs, or two pasted strings should almost match.
- camelCase, snake_case, kebab-case, PascalCase, and slugify — naming conventions from one phrase.
- Jaccard, Dice, and Hamming distance — compare two short texts or token sets.
- Leet decode, Porta cipher, and rail fence decode — puzzles and CTF warm-ups; pair with the existing security checks article for real credential hygiene.
Hashes, checksums, and escapes
- SHA3-256, BLAKE2b, and RIPEMD-160 — digests when you need an algorithm beyond SHA-256.
- CRC32C, Adler-32, and BCD encode — wire-format and embedded-style byte views.
- JSON escape, Unicode escape, and shell escape — safe strings for configs and scripts.
Headers, email records, and dates
- HTTP header parse, Content-Type parse, and Set-Cookie parse — split pasted response headers without curl -v scrolling.
- SPF and DMARC — read mechanism tokens from DNS TXT snippets.
- WebSocket accept key — handshake debugging next to Sec-WebSocket-Key.
- Weekdays between dates, next business day, and Excel serial date — planning spreadsheets and SLA math.
Barcodes and trade identifiers
These pages validate format and checksums only—they do not look up live registries.
- UPC and EAN-13 — retail barcode digits.
- ASIN, EORI, and MMSI — marketplace and compliance-style strings.
For the earlier large math and readability batch, see calculators and readability guide. For pasted dev snippets (curl, YAML, UUID), see nine tools for pasted dev work.