Development
Build complete <picture> markup with art-directed crops: per-breakpoint <source media> elements, 1x/2x density candidates or {w}-template width descriptors, optional AVIF/WebP format layers, sizes handling, CLS-safe width/height, plus HTML and JSX flavors with spec-based lint notes.
responsive-picture-srcset-art-direction-builderSecurity
Hide text in a PNG's least-significant bits, extract it back, and run the Westfeld–Pfitzmann chi-square steganalysis with a falling-p curve and LSB plane preview.
image-steganography-embed-detectMath & Numbers
Compute remaining radionuclide activity A(t) = A₀·2^(−t/T½) with λ = ln2/T½ in Bq/Ci/dpm units, for Tc-99m, F-18 and other isotopes.
half-life-activity-decayHealth
Compute renal clearance C = U × V / P with direct or timed-collection urine flow, interpreted against GFR ≈ 125 mL/min (reabsorption / inulin-like / secretion). Not medical advice.
renal-clearance-physiologyHealth
Estimate ERPF from PAH clearance (C = U·V/P, normal ~500–700 mL/min), plus true RPF, renal blood flow from Hct, and filtration fraction from GFR. Not medical advice.
renal-plasma-flowHealth
Calculate RER = V̇CO₂/V̇O₂ from measured gas exchange. Resting interpretation: 0.70 fat, 0.80 mixed diet, 1.00 carbohydrate; exercise interpretation: RER ≥ 1.10 supports maximal effort. Not medical advice.
respiratory-exchange-ratioHealth
Interpret an RQ against the Lusk non-protein table: 1.00 carbohydrate, 0.707 fat, interpolated %CHO/%fat and kcal per L O₂. RQ above 1.0 is flagged as non-steady-state CO₂ excess. Not medical advice.
respiratory-quotient-substrateHealth
Doubling/halving time from a periodic growth rate: rule-of-70/72/69.3 estimate vs exact discrete and continuous times, with a milestone table.
population-doubling-time-rule70Design
End-to-end frosted-glass / neumorphism CSS snippet generator: blur+saturate backdrop, tint, border, layered shadows, grain overlay, @supports fallback, -webkit- prefix, Tailwind mapping and live preview.
glassmorphism-css-snippet-builderEducation
Specific growth rate µ from a doubling time or two counts, with per-hour/day/minute rates and E. coli benchmarks. Educational use only.
growth-rate-constantEducation
Sums ProtParam residue masses for a peptide sequence (mono or average) and reports M, [M+H]⁺, [M+Na]⁺, [M+2H]²⁺. Educational use only.
peptide-mass-calculatorEducation
One-step protein unit conversion across mg/mL, µg/mL, g/L, % w/v, µM, nM, mM, and pmol/µL via molecular weight, with bench landmarks. Educational use only.
protein-concentration-converter