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➗ MathFree
Common factor calculator
See every whole number that divides all your integers exactly: 12, 18 and 30 share the factors 1, 2, 3 and 6, and their greatest common divisor is 6.
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🏗️ Engineering & constructionFree
Final angular velocity calculator
A wheel spinning at 10 rad/s that gains 2 rad/s every second reaches 20 rad/s after 5 seconds: the calculator adds αt to ω₀ and lays out each step.
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🏗️ Engineering & constructionFree
Impulse from force graph calculator
A pulse that peaks at 100 N and lasts 0.04 s delivers 2 N·s, the area of the triangle under its force-time graph.
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🏗️ Engineering & constructionFree
Two-dimensional collision calculator
A 2 kg body moving at 3 m/s along x that sticks to a 4 kg body moving at −1 and 2 m/s leaves with it at 1.3743685419 m/s, at 75.9637565321°.
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🏠 Home, food & hobbiesFree
Leftover food safety window
Cooked meat that went into the fridge on 20 July 2026 should be eaten between 23 and 24 July, a window of 3 to 4 days.
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🏠 Home, food & hobbiesFree
Convert oven temperature scale
Switch an oven setting between Celsius, Fahrenheit and British gas marks: 180 °C is 356 °F, closest to gas mark 4.
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🏠 Home, food & hobbiesFree
Travel packing list generator
Enter 7 days, hot weather and a beach trip and you get a checklist of 57 items in five groups, from passport and sunscreen to 8 pairs of socks.
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🏠 Home, food & hobbiesFree
Complementary room color scheme
Start from a wall colour such as #6B8E9F and get a pale trim #E4E6E6 in the same hue plus a contrasting accent #9E6E56 from the opposite side of the colour…
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🏠 Home, food & hobbiesFree
Pet food portion calculator
An 18 kg dog with normal activity needs about 978.8 kcal a day, roughly 272 g or 2.72 cups of reference dry food.
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🏠 Home, food & hobbiesFree
Houseplant watering schedule calculator by pot size
A pothos in a 6-inch pot gets a check every 7 days; smaller pots dry sooner and larger ones hold moisture longer.
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🏠 Home, food & hobbiesFree
Scale Recipe Ingredient Quantities by Serving Count
Going from 4 to 10 servings multiplies everything by 2.5: 300 g of flour becomes 750 g and 2 eggs become 5.
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🏠 Home, food & hobbiesFree
Convert recipe cooking units
One US cup of flour is about 125 g, while a cup of honey weighs far more: pick the ingredient and convert between cups, spoons, milliliters, grams and ounces…
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➗ MathFree
Least common multiple calculator
Get the smallest positive number that two integers both divide: the least common multiple of 12 and 18 is 36, so machines cycling every 12 and every 18 minutes…
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🏠 Home, food & hobbiesFree
Newborn feeding schedule calculator
Enter your baby's age in weeks and see the usual feeding pattern: at 4 weeks that is 6 to 10 feeds a day, every 2.5 to 4 hours, with 3 to 5 ounces per feed.
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🏠 Home, food & hobbiesFree
Baby growth percentile lookup
A 24-month-old girl who weighs 12 kg lands in the 50th-to-85th percentile band. Enter age in months, sex and one weight or height to see the band and the…
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🏠 Home, food & hobbiesFree
Split household chores schedule
Four chores shared by three roommates complete a full rotation in 12 weeks, and weekly loads are never more than one chore apart.
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🏠 Home, food & hobbiesFree
Flashcard spaced repetition calculator
A card reviewed on 5 August 2026 with a 10-day interval and a recall score of 4 comes back in 25 days, on 30 August 2026.
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🏠 Home, food & hobbiesFree
Split a gift budget among recipients by priority
A gift budget of 100 split by priority weights of 3, 2 and 1 gives 50, 33.33 and 16.67, which add up to exactly 100.
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🏠 Home, food & hobbiesFree
Convert pet age to human years
A 3-year-old medium dog is about 29 in human years, not 21: early years count far more than later ones.
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🏠 Home, food & hobbiesFree
Estimate time to finish a reading list
Two books of 412 and 304 pages at 30 pages a day, starting on 25 July 2026, end on 7 and 18 August: 716 pages in 25 days.
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🏠 Home, food & hobbiesFree
Build exam study schedule
With Math weighted 3, Physics 2 and History 1, a 4-hour study day gives Math 2 hours, and over 10 days that is 20 of your 40 hours.
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🏠 Home, food & hobbiesFree
Assign wedding table seating
14 guests at tables of 8 become 2 tables: the bride's family and the college friends fill the first, the groom's family and two guests with no group sit at the…
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🏠 Home, food & hobbiesFree
APA citation generator
A 2020 book by John A. Smith becomes Smith, J. A. (2020). *The practice of everyday research*. Academic Press.
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🏠 Home, food & hobbiesFree
Convert GPA to a 4.0 scale
An 87 average on a 100-point scale becomes 3.48 on the 4.0 scale. Enter the GPA and the highest value its own scale allows, then choose a straight proportion or…
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🏠 Home, food & hobbiesFree
Compare text similarity
Two sentences that share 3 of their 19 distinct three-word runs score 15.79% similar. Compare a draft with a source, or two revisions, and see how much exact…
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⚙️ Developer UtilitiesFree
Validate feature flag names
Paste a flag name and see at once whether it follows the convention: enable-checkout-express passes, with the prefix enable and three lowercase segments.
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⚙️ Developer UtilitiesFree
Extract GraphQL query variable names and types
Paste a GraphQL document and get its declared variables per operation: FindUser declares id as ID!, filters as [UserFilter!] and limit as Int, and Rename…
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🕸️ Web Scraping & MonitoringFree
HTTP method for a CRUD action
Type create and get the conventional method with 201 Created, a route hint and a note on the convention; update returns PUT for a full replacement and points to…
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⚙️ Developer UtilitiesFree
Extract OpenAPI path parameters in template order
Pull the parameter names out of a path template in the exact order they appear: /users/{id}/posts/{postId} gives id, then postId.
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🏠 Home, food & hobbiesFree
Trip carbon footprint calculator for car, train, plane, or bus
A 350 km train trip comes to 14.35 kg of CO2e for one passenger. Choose car, train, plane or bus, enter the distance in kilometres and see the estimate together…
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🏠 Home, food & hobbiesFree
MLA citation formatter
Toni Morrison's Beloved from 1987 becomes Morrison, Toni. *Beloved*. Alfred A. Knopf, 1987. Enter author, title, year and publisher, choose book, article…
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🏠 Home, food & hobbiesFree
Commute cost calculator
Driving 12 miles each way at 28 mpg with 15 a day in parking costs 18 a day, while a 6.5 transit fare saves 253 a month.
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🏠 Home, food & hobbiesFree
Check interview answer STAR structure
An answer that sets the scene, states your own task, lists the steps you took and ends with a measured outcome scores 100, with all four STAR parts present.
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🏠 Home, food & hobbiesFree
Resume length check
A 620-word resume with 4 years of experience is too long: the guideline is one page, about 550 words, so trim roughly 70 words.
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🏠 Home, food & hobbiesFree
Salary negotiation range calculator
With a market rate of 85,000 and the 75th percentile, you ask between 106,250 and 110,500 and aim for 108,375.
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🏠 Home, food & hobbiesFree
Pomodoro study session planner
In 120 minutes, 25-minute focus blocks with 5-minute rests fit exactly 4 pomodoro cycles: 100 minutes of work and 20 of breaks, with nothing left over.
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🏠 Home, food & hobbiesFree
Generate a Wedding Planning Countdown Checklist
For a wedding on 19 June 2027 planned from 5 August 2026 you get 318 days to go and ten stages, from twelve months before to the day itself, each with its…
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⚙️ Developer UtilitiesFree
Shorten a Git commit hash to any valid length
Cut a full Git commit hash to exactly the length you choose: 8f14e45fceea167a5a36dedd4bea2543d2f6b721 at 12 characters becomes 8f14e45fceea, the same on every…
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Runs in your browser
⚙️ Developer UtilitiesFree
Resolve configuration value precedence
Find out which configuration value really wins: with a default of development, a file saying staging and an environment variable saying production, the usual…
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Runs in your browser
⚙️ Developer UtilitiesFree
Calculate a deterministic feature rollout percentage bucket
Enter a stable identifier and a rollout percentage to see whether that user is in: one sample user lands in bucket 81.41, so a 25% rollout leaves them out.
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Runs in your browser
⚙️ Developer UtilitiesFree
Git branch naming convention validator
Give a branch name and your naming template: feature/ABC-123-add-login against type/ticket-description passes and splits into type feature, ticket ABC and…
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Runs in your browser
⚙️ Developer UtilitiesFree
Idempotency key format check
Paste an idempotency key and see at once whether it is safe to send: order-7f3a9c2e-2026-07-25 passes, with 25 characters between the minimum of 16 and the…
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Runs in your browser
⚙️ Developer UtilitiesFree
Rank log level severity order
Put log levels in their true order and compare any two: trace, debug, info, warn, error and fatal rise in severity, so warn against error comes out one step…
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Runs in your browser
⚙️ Developer UtilitiesFree
Extract regex named capture groups
Paste a pattern such as (?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2}) and get its named groups in order: year, month and day.
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Runs in your browser
🕸️ Web Scraping & MonitoringFree
REST endpoint naming checker
Paste a path such as /users/{id}/orders and see which naming rules it passes: lowercase, hyphen-separated words, plural nouns and no verbs.
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Runs in your browser
⚙️ Developer UtilitiesFree
Diff package.json dependencies
Compare two dependency lists from package.json and see what really moved: react goes from ^17.0.2 to ^18.2.0, axios is added, moment is removed and lodash stays…
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Runs in your browser
⚙️ Developer UtilitiesFree
Derive a URL slug from a Git branch name
Get a URL-friendly slug from a branch name: feature/add-user-login becomes add-user-login, with the workflow prefix left out and symbols turned into hyphens.
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Runs in your browser
⚙️ Developer UtilitiesFree
Parse common log timestamp formats
Apache's 25/Jul/2026:14:30:00 +0200, syslog's Jul 25 14:30:00 and 2026-07-25T14:30:00.123Z each come back as one ISO 8601 UTC time, with epoch milliseconds and…
A
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Webhook delivery retry schedule
Five exponential retries from a base of 1000 wait 1000, 2000, 4000, 8000 and 16000, a total of 31000: choose the number of retries, the base delay and the…
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Runs in your browser
🕸️ Web Scraping & MonitoringFree
Detect API versioning scheme from URL
An address whose path starts with v1 is path-based, version 1, found at /v1. Paste any address to see whether its version sits in the path, after the question…
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Runs in your browser
💰 Finance & moneyFree
Debt snowball vs avalanche order
See which debt comes next under both methods at once: for a 400 store card at 22.9%, a 3200 card at 18.5% and a 1500 loan at 11%, snowball goes store card…
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💰 Finance & moneyFree
Life insurance needs calculator
Replacing an income of 75,000 for 10 years and clearing 50,000 of debts calls for 800,000 of life insurance.
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Runs in your browser
💰 Finance & moneyFree
Days to reach savings goal
With a goal of 1,000, 200 already saved and 50 added every day, you reach the target in 16 days. Pick daily or weekly deposits and see the amount left, the…
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Runs in your browser
💰 Finance & moneyFree
Calculate blended interest rate across multiple loans
A first mortgage of 240,000 at 6.5%, a piggyback loan of 60,000 at 9.25% and 25,000 at 4.75% blend into one rate of just under 7% on 325,000.
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Runs in your browser
💰 Finance & moneyFree
Round-up savings calculator
A 3.45 purchase rounded up to 4.00 sets aside 0.55, and the calculator does the same for every purchase you list, then adds the spare change into one total you…
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Runs in your browser
💰 Finance & moneyFree
Simplified take-home pay estimate
From 5000 gross with 20% tax, 5% retirement and 3% insurance, 1400 is withheld and 3600 reaches your bank.
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💰 Finance & moneyFree
Marginal tax bracket lookup and progressive tax calculator
On 50,000 of taxable income with bands starting at 0, 11,600 and 47,150, the marginal rate is 22% and the tax is 6,053, shown band by band so you can check each…
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Runs in your browser
🎧 Audio & VoiceFree
Audio export preset lookup
Pick podcast and you get MP3 at a constant 128 kbps, 44.1 kHz, stereo: one coordinated starting point for the export dialog instead of a page of encoder…
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Runs in your browser
🎧 Audio & VoiceFree
Peak normalization gain calculator
A recording that peaks at -8.4 dBFS needs +7.4 dB of gain to reach a -1 dBFS target. Enter the measured peak and the target, and get the gain to apply in your…
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Runs in your browser
🎧 Audio & VoiceFree
Seamless loop crossfade calculator
A 120-second track with a 5-second crossfade starts fading at 115 seconds and repeats on a 115-second cycle.
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How it works
1
Get your key
Create an account with your email and add balance when you need it. No subscription, no sales call.
2
Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
Collect the result
Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
Pay only for what you use
No subscription. Free tools run in your browser; paid tasks draw from your balance, which never expires.
Free tools
$0.00
On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.
Pay-as-you-go
Per task
$0.002+
The full API — 7800+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
Balance
$10.00+
Top up your balance and spend it across web, API and the app. It never expires.