Developer Utilities
Small developer utilities that save a trip to a random website. Encode and decode Base64, explain a regex, build UTM links, generate QR codes and vCards, and more — the everyday helpers. Free in your browser, and available by API when you need them in a script.
Developer Utilities
Poker hand odds
exact pair, flush, full house probability
POST /prob/poker-odds$0.002Developer Utilities
Beam deflection calculator
simply supported max δ = PL³/(48EI)
POST /sci/beam-deflection$0.002Developer Utilities
Bending stress calculator
σ = My/I elastic flexure formula
POST /sci/bending-stress$0.002Developer Utilities
Gear ratio calculator
teeth counts to GR and output speed, free
POST /sci/gear-ratio$0.002Developer Utilities
Shear stress calculator
τ = F/A in pascals, free
POST /sci/shear-stress$0.002Developer Utilities
Stress calculator
mechanical stress σ = F/A in pascals and megapascals, free
POST /sci/stress$0.002Developer Utilities
Thermal stress calculator
constrained bar σ = E·α·ΔT in Pa and MPa, free
POST /sci/thermal-stress$0.002Developer Utilities
Young's modulus calculator
elasticity E = σ/ε, solve stress, strain or E, free
POST /sci/youngs-modulus$0.002Developer Utilities
Coefficient of variation calculator
CV ratio and percentage from a list
POST /stat/coefficient-variation$0.002Developer Utilities
Five-number summary calculator
min, Q1, median, Q3, max of a data set, free
POST /stat/five-number-summary$0.002Developer Utilities
Geometric mean calculator
n-th root of the product of positive numbers, free
POST /stat/geometric-mean$0.002Developer Utilities
Harmonic mean calculator
reciprocal average of positive numbers
POST /stat/harmonic-mean$0.002Developer Utilities
Linear regression calculator
least-squares slope, intercept and R², free
POST /stat/linear-regression$0.002Developer Utilities
Mean median mode calculator
average, mid value, most common, range
POST /stat/mean-median-mode$0.002Developer Utilities
Quartile and IQR calculator
Q1 Q2 Q3, range and outlier fences
POST /stat/quartiles$0.002Developer Utilities
Skewness and kurtosis calculator
sample shape of a data set
POST /stat/skewness-kurtosis$0.002Developer Utilities
Variance calculator
population and sample variance with mean
POST /stat/variance$0.002Developer Utilities
Weighted average calculator
mean of values with weights
POST /stat/weighted-mean$0.002Developer Utilities
Z-score calculator
standardize values with mean and standard deviation, free
POST /stat/z-score$0.002Developer Utilities
Remove duplicate lines
keep first occurrences, free online
POST /str/dedupe-lines$0.002Developer Utilities
Convert to dot.case
turn any phrase into dot.case, free
POST /str/dot-case$0.002Developer Utilities
List unique words
extract word list in order, free
POST /str/extract-unique-words$0.002Developer Utilities
Find and replace text
swap every match, free online
POST /str/find-replace$0.002Developer Utilities
Kebab-case converter
lowercase words joined with hyphens, free
POST /str/kebab-case$0.002Developer Utilities
Count lines
total, non-empty and blank, free
POST /str/line-count$0.002Developer Utilities
Convert to lowercase
turn any text into lower case letters, free
POST /str/lowercase$0.002Developer Utilities
Add line numbers to text
sequential numbering, free online
POST /str/number-lines$0.002Developer Utilities
Pad text
fill a string to a target width left, right, or both sides, free
POST /str/pad$0.002Developer Utilities
Count paragraphs
blank-line paragraph counter, free
POST /str/paragraph-count$0.002Developer Utilities
PascalCase converter
convert text to PascalCase, free
POST /str/pascal-case$0.002Developer Utilities
Remove accents from text
strip diacritics to plain ASCII letters, free
POST /str/remove-accents$0.002Developer Utilities
Remove line breaks from text
join to a single line (optional space), free
POST /str/remove-line-breaks$0.002Developer Utilities
Remove extra spaces
collapse repeated spaces and trim, free
POST /str/remove-spaces$0.002Developer Utilities
Reverse text
flip character order, Unicode-safe, free
POST /str/reverse$0.002Developer Utilities
Reverse word order
flip words, keep each word intact, free
POST /str/reverse-words$0.002Developer Utilities
Sentence case converter
capitalize sentences, free
POST /str/sentence-case$0.002Developer Utilities
Sentence counter
count sentences in text free
POST /str/sentence-count$0.002Developer Utilities
Convert to snake_case
turn any phrase into snake_case, free
POST /str/snake-case$0.002Developer Utilities
Sort lines alphabetically
A–Z or Z–A, free online
POST /str/sort-lines$0.002Developer Utilities
Title case converter
capitalize words with small-word rules, free
POST /str/title-case$0.002Developer Utilities
Trim whitespace from every line
strip leading and trailing spaces, free
POST /str/trim-lines$0.002Developer Utilities
Truncate text
max length with ellipsis, optional word boundary, free
POST /str/truncate$0.002Developer Utilities
Word & character counter
count words, sentences, paragraphs free
POST /str/word-count$0.002Developer Utilities
Area thermal expansion calculator
ΔA = A₀·α·ΔT free
POST /thermo/area-expansion$0.002Developer Utilities
Bernoulli equation calculator
unknown pressure from density, speed, height, free
POST /thermo/bernoulli-pressure$0.002Developer Utilities
Boyle's law calculator
find final P or V from P1·V1=P2·V2 at constant T, free
POST /thermo/boyles-law$0.002Developer Utilities
Buoyancy calculator
F_b = ρ V g (Archimedes), free
POST /thermo/buoyant-force$0.002Developer Utilities
Celsius to Fahrenheit calculator
convert C↔F free online
POST /thermo/celsius-fahrenheit$0.002Developer Utilities
Pipe flow continuity calculator
outlet speed from A1·v1=A2·v2, free
POST /thermo/continuity-equation$0.002Developer Utilities
Partial pressure calculator
Dalton's law Pi=yi·P, free
POST /thermo/dalton-partial-pressure$0.002Developer Utilities
Entropy change calculator
ΔS = Q/T from heat transferred and absolute temperature, free
POST /thermo/entropy-change$0.002Developer Utilities
Mixing temperature calculator
equilibrium after mixing two masses, free
POST /thermo/final-temperature-mixing$0.002Developer Utilities
Gas density calculator
ideal gas ρ = PM/RT from pressure, molar mass and T, free
POST /thermo/gas-density$0.002Developer Utilities
Molar volume calculator
ideal gas Vm = RT/P from pressure and temperature, free
POST /thermo/gas-molar-volume$0.002Developer Utilities
Gay-Lussac law calculator
P/T at constant volume, free
POST /thermo/gay-lussac-law$0.002Developer Utilities
Specific heat calculator
heat energy Q=mcΔT in joules
POST /thermo/heat-energy$0.002Developer Utilities
Hydrostatic pressure calculator
P = ρ·g·h with optional atmospheric offset, free
POST /thermo/hydrostatic-pressure$0.002Developer Utilities
Ideal gas law calculator
solve PV = nRT for P, V, n, or T, free
POST /thermo/ideal-gas-law$0.002Developer Utilities
Isothermal work calculator
ideal-gas W=nRT ln(V2/V1), free
POST /thermo/isothermal-work$0.002Developer Utilities
Kelvin converter
Celsius, Fahrenheit and Kelvin together, free
POST /thermo/kelvin-converter$0.002