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
Convert to camelCase
phrase to camelCase converter, free
POST /str/camel-case$0.002Developer Utilities
Count characters
with/without spaces and UTF-8 bytes, free
POST /str/char-count$0.002Developer Utilities
Convert to CONSTANT_CASE
phrase to SCREAMING_SNAKE_CASE, free
POST /str/constant-case$0.002Developer Utilities
Count vowels and consonants
digits and other chars too, free
POST /str/count-vowels$0.002Developer Utilities
Word frequency counter
count and rank words in text, free
POST /str/frequency$0.002Developer Utilities
Remove all whitespace
strip spaces, tabs, line breaks free
POST /str/remove-whitespace$0.002Developer Utilities
Repeat text
string repeater with optional separator, free
POST /str/repeat$0.002Developer Utilities
Text to slug
URL-friendly titles with hyphens, free
POST /str/slugify$0.002Developer Utilities
Convert to uppercase
all-caps text converter, free
POST /str/uppercase$0.002Developer Utilities
Boiling point altitude calculator
water Tb vs elevation or pressure, free
POST /thermo/boiling-point-altitude$0.002Developer Utilities
Combined gas law calculator
P₁V₁/T₁ = P₂V₂/T₂, free
POST /thermo/combined-gas-law$0.002Developer Utilities
Coefficient of performance calculator
COP = Q/W refrigerator &, free
POST /thermo/cop-refrigerator$0.002Developer Utilities
Volumetric flow rate calculator
Q = A·v pipe discharge, free
POST /thermo/flow-rate$0.002Developer Utilities
Carnot efficiency calculator
η = 1 − Tc/Th heat engine limit, free
POST /thermo/heat-engine-efficiency$0.002Developer Utilities
Latent heat calculator
Q = mL phase-change energy, free
POST /thermo/latent-heat$0.002Developer Utilities
Poiseuille flow calculator
Q = π r⁴ ΔP / (8 μ L), free
POST /thermo/poiseuille-flow$0.002Developer Utilities
Stefan-Boltzmann calculator
P = εσAT⁴ radiated power, free
POST /thermo/stefan-boltzmann$0.002Developer Utilities
Volumetric expansion calculator
ΔV = V₀βΔT thermal volume change, free
POST /thermo/volumetric-expansion$0.002Developer Utilities
Carry-on size checker
does your bag fit airline limits, free
POST /travel/carry-on-check$0.002Developer Utilities
EV range calculator
km or miles from battery kWh and efficiency, free
POST /travel/ev-range$0.002Developer Utilities
Jet lag recovery calculator
days to adjust by time zones, free
POST /travel/jet-lag-recovery$0.002Developer Utilities
Layover connection time checker
length vs minimum MCT, free
POST /travel/layover-time$0.002Developer Utilities
Trip fuel volume calculator
liters or gallons from distance and MPG, free
POST /travel/trip-fuel-volume$0.002Developer Utilities
Trip total cost calculator
fuel, tolls, lodging and food budget, free
POST /travel/trip-total-cost$0.002Developer Utilities
Degrees to radians converter
and back, free online
POST /trig/deg-to-rad$0.002Developer Utilities
Hypotenuse calculator
find c or a missing leg free online
POST /trig/hypotenuse$0.002Developer Utilities
Arcsine calculator
asin in degrees and radians, free
POST /trig/inverse-sin$0.002Developer Utilities
Trig identity verifier
Pythagorean and quotient residuals, free
POST /trig/pythagorean-identity$0.002Developer Utilities
Secant, cosecant & cotangent calculator
free online
POST /trig/secant-cosecant$0.002Developer Utilities
Unit circle calculator
cos, sin, and radians, free online
POST /trig/unit-circle$0.002Developer Utilities
Binomial expansion calculator
expand (a+b)^n, free
POST /algebra/binomial-expansion$0.002Developer Utilities
Cramer's rule calculator
solve Ax=b with determinants, free
POST /algebra/cramers-rule$0.002Developer Utilities
Cubic equation solver
all three roots of ax³+bx²+cx+d=0 via Cardano, free
POST /algebra/cubic-equation$0.002Developer Utilities
Discriminant calculator
b² − 4ac and root type, free
POST /algebra/discriminant$0.002Developer Utilities
Dot product calculator
vectors, angle, free online
POST /algebra/dot-product$0.002Developer Utilities
2×2 eigenvalue calculator
characteristic equation, free
POST /algebra/eigenvalues-2x2$0.002Developer Utilities
Exponential equation solver
solve b^x = y for x with logs, free
POST /algebra/exponential-equation$0.002Developer Utilities
Factor quadratic calculator
ax²+bx+c into binomials over rationals, free
POST /algebra/factor-quadratic$0.002Developer Utilities
Gaussian elimination solver
solve Ax = b with back-substitution, free
POST /algebra/gaussian-elimination$0.002Developer Utilities
Linear equation solver
solve ax + b = c for x, free
POST /algebra/linear-equation$0.002Developer Utilities
Logarithm expand & condense
product, quotient, power laws, free
POST /algebra/log-expand$0.002Developer Utilities
Logarithm calculator
log base b of x, ln and log10, free
POST /algebra/logarithm$0.002Developer Utilities
Matrix addition & subtraction
entrywise, free online
POST /algebra/matrix-add$0.002Developer Utilities
Matrix determinant calculator
det(A) via cofactor expansion or LU, free
POST /algebra/matrix-determinant$0.002Developer Utilities
Matrix rank calculator
row echelon form and pivots, free
POST /algebra/matrix-rank$0.002Developer Utilities
Matrix trace calculator
sum of main diagonal entries of a square matrix, free
POST /algebra/matrix-trace$0.002Developer Utilities
Matrix transpose calculator
swap rows and columns, free online
POST /algebra/matrix-transpose$0.002Developer Utilities
Partial fraction decomposition
proper rational with linear & quadratic factors, free
POST /algebra/partial-fractions$0.002Developer Utilities
Polynomial addition calculator
add or subtract coefficient lists, simplified result, free
POST /algebra/polynomial-add$0.002Developer Utilities
Polynomial multiplication calculator
multiply two coefficient lists, free
POST /algebra/polynomial-multiply$0.002Developer Utilities
Polynomial root finder
all real roots from coefficients, free
POST /algebra/polynomial-roots$0.002Developer Utilities
Quadratic formula solver
roots, discriminant and vertex of ax²+bx+c=0, free
POST /algebra/quadratic-formula$0.002Developer Utilities
Rational root theorem
list candidate roots p/q, free
POST /algebra/rational-root$0.002Developer Utilities
Remainder theorem calculator
evaluate p(r) by Horner, free
POST /algebra/remainder-theorem$0.002Developer Utilities
Synthetic division calculator
divide by x − r, free
POST /algebra/synthetic-division$0.002Developer Utilities
Solve a 2×2 system of linear equations
Cramer's rule, free
POST /algebra/system-2x2$0.002Developer Utilities
Vector magnitude calculator
Euclidean norm and unit vector, free
POST /algebra/vector-magnitude$0.002Developer Utilities
Vector projection calculator
scalar & vector proj, free
POST /algebra/vector-projection$0.002Developer Utilities
Vieta's formulas calculator
sum and product of polynomial roots from coefficients, free
POST /algebra/vieta-formulas$0.002Developer Utilities
Angular size calculator
diameter in degrees & arcmin, free
POST /astro/angular-size$0.002