Text Processing

Run a portable text-cleaning recipe and inspect every step, diff, timing, and character change.

Education

Simulate Wright–Fisher genetic drift across many replicate populations with mutation and selection. Visualize drift trajectories, the final-frequency distribution, heterozygosity decay Hₜ = H₀(1−1/2Nₑ)ᵗ, and run a Hardy–Weinberg chi-square test.

Development

Upload a PE-COFF (.exe/.dll), ELF or Mach-O binary and parse its headers end to end: DOS/PE signature, COFF machine, optional header (entry point, image base, subsystem, ASLR/NX/CFG), section table with RVA↔offset mapping, import/export directories, ELF program headers and PIE detection, dynamic symbols and DT_NEEDED, Mach-O load commands and dylibs — with cross-architecture annotations and a hex preview.

Math & Numbers

Fit zero-order, first-order, and second-order rate equations to concentration-time data. Get reaction order, rate constant k, half-life t½, and R² goodness-of-fit.

Utilities

Convert any date to ISO 8601 week number, day-of-year, Julian Day, and fiscal-quarter boundaries (4-4-5, 4-5-4, 13-week, or standard).

Network

Plan 2.4, 5, and 6 GHz Wi-Fi channels from measured AP channels, widths, and RSSI, with overlap, DFS, and PSC warnings.

Finance

Compare a raise or job offer after inflation, convert salary periods, and check whether longer hours erase your hourly gain.

Media

Detect which instruments play in a track: onset-split note analysis scores every event against 13 timbre profiles and reports ranked instruments, families and per-note evidence.

Development

Rewrites span/log attribute names across OpenTelemetry semantic-convention versions: http.method → http.request.method, http.status_code → http.response.status_code, http.url → url.full, db.system → db.system.name, messaging.destination → messaging.destination.name and 25+ more — applied to pasted JS/TS/Python/Go/Java/.NET source, collector YAML or Grafana dashboard JSON, with an OTel Collector transform rename map, removal/manual-split warnings, per-attribute diff stats and an unmapped-attribute report.

Calculator

Converts pay bi-directionally (hourly ↔ monthly ↔ annual) under four overtime regimes — US FLSA 1.5x over 40h/week with bonus-blended regular rate, China’s 150/200/300% tiers off the 21.75-day month, and contractual-multiplier EU/UK with 48h-average checks — pricing weekday, weekend and holiday overtime, night-shift premium and annual bonus, with itemized subtotals, effective hourly rate and compliance warnings.

Converter

Decode binary key-value store artifacts byte by byte: Redis RDB snapshots, LevelDB/RocksDB WAL records and SSTable footers, Memcached binary packets, BoltDB and LMDB page headers — with keyspace hex-diff and TTL expiry matrix.

Development

Validate W3C Trace Context propagation headers end to end: traceparent (version / 16-byte trace-id / 8-byte parent-id / trace-flags), tracestate (≤32 list members, tenant keys), baggage (percent-encoded values + opaque properties), OTLP export Content-Type, the gRPC grpc-trace-context-bin 25-byte binary context — plus a two-header correlation round-trip with a random child span-id collision check.