Saylor Innovations Dev Tools

Age calculator from birthdate - exact age in years, months and days, total days lived and days until the next birthday

Days between two dates calculator - total days, weeks, years-months-days and business days between any two dates

Percentage calculator - percent change between two numbers, percent of a number, what percent one number is of another, and increase or decrease by a percentage

Loan amortization schedule calculator - monthly payment, total interest, payoff time and first 12 payments, with savings from an extra monthly payment

Cron expression explained in plain English with the next run times in any time zone - validates a 5-field cron and handles DST

Regex tester - matches, capture groups and named groups for a JavaScript pattern against text

Math expression evaluator - arithmetic, powers, percent, factorial and functions like sqrt, log and sin

CSV to JSON converter - parses quoted CSV with a chosen delimiter and header row into an array of objects

Unix timestamp converter - unix seconds or milliseconds to ISO 8601 date, weekday and day of year, or a date to unix time

Inflation calculator - future cost of today's money and purchasing power loss over years at a given inflation rate

Savings goal calculator - months to reach a target from monthly savings, current balance and interest rate

ROI calculator - return on investment percent, gain, multiple and annualized return from amount invested and returned

Profit margin and markup calculator - margin percent, markup percent and profit from cost and price, or the price for a target margin

URL parser - scheme, host, port, path segments, query parameters and fragment from any absolute URL

Bitcoin address validator - checks base58check and bech32/bech32m checksums, returns network, address type (P2PKH, P2SH, P2WPKH, taproot) and encoding

Lorem ipsum generator - repeatable placeholder paragraphs with a chosen number of sentences and seed

Text diff - line-by-line differences between two texts with added, removed and unchanged counts and similarity

CIDR subnet calculator - network, broadcast, netmask, wildcard, host range and usable hosts for an IPv4 CIDR block

JSON formatter and beautifier - pretty-print or minify JSON with chosen indent and optional key sorting

JSON validator - checks whether text is valid JSON, with type, size, depth, key count and error line and column

HTML escape and unescape - convert special characters to HTML entities and back

URL encode and decode - percent-encode text for query strings and paths, or decode a percent-encoded string

Base64 encode and decode text - returns standard and URL-safe base64, or the decoded text with UTF-8 detection

Temperature converter - convert between Celsius, Fahrenheit and Kelvin with all three equivalents

Area converter - convert between acres, hectares, square meters, square feet and square kilometers with all equivalents

Speed converter - convert between mph, km/h, m/s, knots and ft/s with all equivalents

Volume converter - convert between liters, gallons, quarts, cups, tablespoons and milliliters with all equivalents

Weight converter - convert between pounds, kilograms, ounces, grams, stone and tons with all equivalents

Add days or business days to a date - calendar or weekday offset from a start date, returns the resulting date and weekday

Compound interest calculator - final balance, interest earned and year-by-year growth for a principal, rate, years and optional monthly contribution