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
Maximum Operating Depth Calculator for Nitrox and Trimix
POST /hobby/sport-dive-mod$0.002Developer Utilities
Hiking time with elevation calculator
pace, climb, descent
POST /hobby/sport-hike-time-elevation$0.002Developer Utilities
Rowing 500m Split Calculator for Distance and Time
POST /hobby/sport-rowing-split$0.002Developer Utilities
Even-pace split times calculator
cumulative race splits at a target pace
POST /hobby/sport-run-even-splits$0.002Developer Utilities
Count numbers in text
find integer and decimal groups
POST /str/count-numbers$0.002Developer Utilities
Climbing rope impact force calculator
peak force from fall factor
POST /hobby/sport-climb-impact-force$0.002Developer Utilities
Average syllables per word calculator
POST /str/average-syllables-per-word$0.002Developer Utilities
Count unique words
vocabulary size after case-fold, free
POST /str/count-unique-words$0.002Developer Utilities
Find longest word
letter length, ties, typography fit, free
POST /str/longest-word$0.002Developer Utilities
Convert to COBOL-CASE
uppercase words joined with hyphens
POST /str/cobol-case$0.002Developer Utilities
Coleman-Liau index calculator
US grade from letters, words, sentences
POST /str/coleman-liau$0.002Developer Utilities
Get first word from text
trim spaces and punctuation, free
POST /str/first-word$0.002Developer Utilities
Normalize whitespace
collapse spaces and lines
POST /str/normalize-whitespace$0.002Developer Utilities
Count Stop Words in Text for SEO Analysis
POST /str/stopword-count$0.002Developer Utilities
Normalize Hyphens and Dashes
Fix Unicode Dash Characters
POST /str/normalize-dashes$0.002Developer Utilities
Remove non-ASCII characters
strip accents, emoji, symbols
POST /str/remove-non-ascii$0.002Developer Utilities
Remove soft hyphens
strip invisible SHY from PDF text, free
POST /str/remove-soft-hyphens$0.002Developer Utilities
Sort lines numerically
order text by number online
POST /str/sort-lines-numeric$0.002Developer Utilities
Trim blank lines top and bottom
keep middle
POST /str/trim-blank-edges$0.002Developer Utilities
Number lines with a custom start and step
POST /str/enumerate-lines-custom$0.002Developer Utilities
Join lines with a separator
lists to inline text, free
POST /str/join-lines$0.002Developer Utilities
Pad a string on the right to a fixed length
POST /str/pad-right$0.002Developer Utilities
Sort words by length
shortest to longest, free in browser
POST /str/sort-words-length$0.002Developer Utilities
Truncate in the middle
keep start and end of paths, free
POST /str/truncate-middle$0.002Developer Utilities
Wrap each line with text
add a prefix and suffix to every line, free
POST /str/wrap-each-line$0.002Developer Utilities
Extract IP addresses from text
online IPv4 extractor
POST /str/extract-ip-addresses$0.002Developer Utilities
Extract numbers from text
integers and decimals listed, free
POST /str/extract-numbers$0.002Developer Utilities
Extract words ending with a suffix
rhyme and filter list
POST /str/extract-words-ending$0.002Developer Utilities
Jaro similarity calculator for two strings
POST /str/jaro-similarity$0.002Developer Utilities
Unique lines preserving order
keep first, never sort, free
POST /str/unique-lines-ordered$0.002Developer Utilities
Convert em units to pixels
CSS parent font size calculator
POST /str/em-to-px$0.002Developer Utilities
Expand typographic ligatures
fix fi and fl text
POST /str/expand-ligatures$0.002Developer Utilities
Find position of substring
first character index, free
POST /str/index-of$0.002Developer Utilities
Words per line calculator
estimate words from column width
POST /str/words-per-line$0.002Developer Utilities
Transpose CSV rows and columns
swap table orientation, free
POST /str/csv-transpose$0.002Developer Utilities
Convert Lines to a Markdown Checklist
POST /str/markdown-checklist$0.002Developer Utilities
Pad to monospace width
align wide characters in columns, free
POST /str/pad-visual-width$0.002Developer Utilities
Multi-day drive days calculator
days from distance and daily limit
POST /travel/driving-days$0.002Developer Utilities
Two-leg trip time calculator
total time and average speed
POST /travel/trip-time-two-legs$0.002Developer Utilities
Annual fuel cost calculator
yearly gas from mileage, MPG, price
POST /travel/annual-fuel-cost$0.002Developer Utilities
Car depreciation by year calculator
resale value over ownership
POST /travel/car-depreciation-by-year$0.002Developer Utilities
EV cost per mile calculator
energy cost from Wh/mi and $/kWh
POST /travel/ev-cost-per-mile$0.002Developer Utilities
Flight fuel reserve calculator
trip, alternate and reserve fuel
POST /travel/flight-fuel-reserve$0.002Developer Utilities
Gear ratio speed spread calculator
road speed across all gears
POST /travel/gear-speed-spread$0.002Developer Utilities
Aviation oxygen duration calculator
bottle time at altitude
POST /travel/oxygen-duration$0.002Developer Utilities
Takeoff ground-roll calculator
DA, weight, wind and slope
POST /travel/takeoff-ground-roll$0.002Developer Utilities
Tide time for depth calculator
when the tide hits a target height
POST /travel/tide-time-for-height$0.002Developer Utilities
Wind pressure on sail calculator
force from knots and area
POST /travel/wind-force-on-sail$0.002Developer Utilities
Time difference between cities calculator
UTC offsets, free
POST /travel/time-difference-cities$0.002Developer Utilities
Trip nights and days calculator
hotel check-in to check-out stay length
POST /travel/trip-nights-days$0.002Developer Utilities
Aerodynamic drag power calculator
watts from Cd, area and speed
POST /travel/drag-power$0.002Developer Utilities
Hydroplaning speed calculator
wet-road onset from tire PSI
POST /travel/hydroplaning-speed$0.002Developer Utilities
Cabin altitude from pressure calculator
ΔP and flight PA
POST /travel/cabin-altitude$0.002Developer Utilities
Metric to inch tire size converter
flotation size and back
POST /travel/metric-to-inch-tire$0.002Developer Utilities
Cross-currency rate calculator
implied FX via a shared base
POST /travel/cross-currency-rate$0.002Developer Utilities
Wind-shear gradient calculator
vertical ΔV/Δz from two altitudes
POST /travel/wind-shear-gradient$0.002Developer Utilities
Codominance cross ratio calculator
offspring phenotypes, free
POST /bio/codominance-cross-ratio$0.002Developer Utilities
Itinerary time budget calculator
allocate daily hours and rest
POST /travel/itinerary-time-budget$0.002Developer Utilities
Chi-square degrees of freedom genetics
df from phenotype classes
POST /bio/chi-square-dof-genetics$0.002Developer Utilities
Coefficient of relationship calculator
Wright r from pedigree paths
POST /bio/coefficient-of-relationship$0.002