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Gillespie stochastic simulator #988 Simulate small reaction networks one molecule at a time with Gillespie's exact stochastic algorithm. Run many times to see the mean, the spread and single runs against the deterministic ODE, and the distribution of counts at the end against a Poisson distribution, with the Fano factor. Gene network viewer #987 Open or paste a gene regulatory network as SIF or GraphML and see it drawn with a force-directed layout, activating edges as arrows and repressing edges as bars, with in- and out-degree for every gene, connected parts, autoregulation, two-gene feedback loops and feed-forward loops sorted into coherent and incoherent. Your file stays on your device. Pathway ODE builder #986 Type a pathway as reactions (mass action, reversible, Michaelis-Menten or Hill) and get its differential equations, a simulated time course from an adaptive Runge-Kutta solver, and a least-squares fit of chosen rate constants to your own measured time courses, with standard errors. Volcano plot and PCA #985 Paste or open a metabolite table (peak areas or concentrations, samples in columns) and compare two groups: fold changes, Welch's t-tests, Benjamini-Hochberg FDR q-values and a labelled volcano plot, plus a PCA of all samples with scores, explained variance and the top loadings. Log transforms, missing-value handling and autoscaling or Pareto scaling. Your data stay on your device. Adduct and neutral loss calculator #984 Type a formula or a neutral monoisotopic mass and get the m/z of 25 common electrospray adducts in positive and negative mode, the ions left after common neutral losses (water, ammonia, CO2, sugars, phosphate and your own), and match a list of observed m/z values within a ppm tolerance. With no molecule, it turns observed m/z values into candidate neutral masses. Genetic circuit designer #980 Type a genetic design as a list of parts and regulatory interactions and get a clean SBOL Visual style diagram with repression and activation arcs, its transcription units, and checks for missing RBSs, promoters and terminators. Download as SVG or PNG. Oscilloscope CSV viewer #979 Open the CSV your oscilloscope saves and get the measurements a scope makes: frequency and period, 10-90 % rise and fall time, top, base, peak to peak, RMS, duty cycle, and the delay and phase between two channels, with a plot of every channel and a zoom on the first edge. Dimensional analysis checker #978 Type an equation and the unit of each symbol, and see whether both sides have the same SI dimensions, which added term or function argument breaks it, and what any unit is in SI base units (kg, m, s, A, K, mol, cd). Physical constants #977 Look up the fundamental physical constants (speed of light, Planck, Boltzmann, Avogadro, electron and proton masses, fine-structure constant and 60 more) as recommended by CODATA in 2022 and 2018, with their units, standard uncertainties and one-tap copy, all working offline. Curve fitter #976 Fit a straight line, polynomial, exponential, power law, Gaussian, sine wave or your own formula to x, y data, weighted by the y uncertainties if you have them, and get each parameter with its uncertainty and 95 % interval, chi-square, reduced chi-square and p-value, residuals and correlations. Significant figures checker #975 Count the significant figures in any number and see which digits count, round to significant figures or decimal places (half up or half to even, with exact decimal arithmetic), write a value and its uncertainty the way lab reports expect, apply the sum and product rules, and check a whole table of results at once. Optical tweezers calibration #974 Paste a trapped bead's position record and get the trap stiffness two ways: from the corner frequency of a Lorentzian fitted to the power spectrum (with the aliasing correction for sampled data and Faxén's correction near a surface), and from equipartition. Works in volts too, giving the detector's nm per volt.