Microapp

Showing 25 of 82 from the live probe.

• Percentage Calculator

  Calculate percentages three ways: what's X% of Y, what % is X of Y, and what's the % change from X to Y. Use mode='of' for the first form, mode='ratio' for the second, mode='change' for the third.

• Tip Calculator

  Compute the tip, total, and per-person split for a bill. All amounts use the same (unspecified) currency — the engine doesn't care about currency codes.

• Discount Calculator

  Apply a percentage discount to a price. Returns sale price, amount saved, and the discount percentage echoed back.

• Aspect Ratio

  Compute the simplified aspect ratio of a width × height pair, plus the decimal ratio. Useful for image, video, screen, and design contexts.

• Days Between

  Calculate the number of days between two ISO 8601 dates. Returns days, weeks, months, and years (decimal). Inclusive count = absolute |end - start|.

• Average Calculator

  Compute summary statistics for a list of numbers: count, sum, mean, median, min, max, and mode(s).

• Square Root Calculator

  Compute square root, cube root, square, and cube of a number. Returns all four so callers don't have to call four tools.

• Prime Checker

  Test whether an integer ≥ 2 is prime. Returns the verdict plus the prime factorization (useful for composite numbers).

• Fraction Simplifier

  Simplify a fraction to lowest terms. Returns the simplified numerator/denominator, the decimal value, the gcd used, and the equivalent percentage.

• Rem To Px

  Convert REM (relative to root font size) to pixels. Defaults to a 16px base (browser default); pass base_px to use a different root size.

• Salary To Hourly

  Convert an annual salary to hourly, daily, weekly, and monthly equivalents. Defaults to a standard 40-hour, 52-week schedule.

• Geometric Mean

  Compute the geometric mean (n-th root of the product) of a list of positive numbers. Also returns the arithmetic mean for comparison.

• Scientific Notation

  Convert a number to scientific and engineering notation. Returns the coefficient, exponent, and several human-readable forms.

• Age On Other Planets

  Given an age in Earth days, return the equivalent age in years on each of the eight planets plus Pluto. Years are sidereal orbital periods from the NASA Planetary Fact Sheet; Earth uses the Julian year (365.25 days) for calendar alignment.

• Weight On Other Planets

  Given a weight on Earth (in kg or lb), return the equivalent weight on each of the eight planets plus Pluto. Surface-gravity values are from the NASA Planetary Fact Sheet; the ratio is gravity-on-planet ÷ Earth's 9.80665 m/s².

• Heartbeats Since Birth

  Estimate the total number of heartbeats a person has had since birth, given their date of birth and a reference 'now' timestamp. Uses an average resting heart rate of 80 bpm (American Heart Association adult midpoint) by default; the caller can override. Returns heartbeats, breaths, minutes alive, and days alive.

• Year Progress

  Calculate how much of a calendar year has elapsed at a given moment. Returns percent elapsed/remaining, day-of-year, seconds elapsed/remaining, leap-year flag, and a 20-char ASCII progress bar. Useful for goal-tracking and 'how much of the year is left' moments.

• Ab Test Calculator

  Two-proportion z-test for A/B conversion-rate experiments. Returns each arm's rate and 95% Wald confidence interval, the absolute and relative lift, the z statistic, the two-tailed p-value, and a significance decision at the given alpha (default 0.05).

• Ab Test Sample Size

  Required sample size per arm for a two-proportion A/B test, given the expected baseline conversion rate, the minimum detectable effect (relative lift), the significance threshold alpha (default 0.05, two-tailed), and the statistical power (default 0.80).

• Arctan Calculator

  Compute arctan(x) — the inverse tangent — in either degrees or radians. The result is the angle θ such that tan(θ) = x, with θ constrained to (-90°, 90°) / (-π/2, π/2). For two-argument arctan that resolves the full circle, use atan2 instead.

• Bitwise Operations Calculator

  Run a bitwise operation (AND, OR, XOR, NOT, <<, >>, >>>) on two BigInt operands and return the result in decimal, hex, binary, octal, plus the low-32-bit binary representation.

• Board Foot Calculator

  Compute board feet for lumber. Formula: (thickness_in × width_in × length_in × qty) / 144. One board foot is a piece 1 in thick × 12 in wide × 12 in long.

• Burn Rate Calculator

  Compute a startup's gross burn, net burn, and runway from starting cash, ending cash, the period in months, and optional monthly revenue. Returns a health label benchmarked to standard SaaS funding-stage runway expectations.

• Cidr Calculator

  Parse an IPv4 CIDR block (or an IP + dotted-decimal mask) and return network, broadcast, first/last usable host, total + usable IP counts, subnet/wildcard masks, the mask in binary, and the legacy IPv4 class.

• Coffee Habit Cost Calculator

  Compare the total nominal cost of a recurring coffee habit (drink price × times per week × years) against what the same weekly amount would have grown to if invested at a given annual return. Returns total spent, invested future value, and the opportunity-cost gap. The goal is to make compounding visible — not to moralize about coffee.