Fewest land border crossings between two countries, with the countries passed through, or NO_LAND_ROUTE.

Mix two hex colors at a ratio in sRGB or in linear light (physically correct), returning the blended hex.

Convert a hex color to RGB, HSL, HSV and CMYK with CSS strings and relative luminance, exactly.

Lighten, darken, saturate, desaturate or rotate the hue of a hex color by an exact number of HSL points.

Country fact sheet by code or name: region, capital, area, borders, currencies, languages, calling code, driving side, zones.

List a country's land neighbours, or all countries within 2-3 border crossings, with landlocked status.

Generate a color palette from a base hex color: complementary, analogous, triadic, tetradic, split-complementary or monochrome.

Which side of the road a country drives on, and which neighbours drive on the other side (switch borders).

List countries by region, currency code, language, driving side, landlocked or UN membership; at least one filter.

Simulate protanopia, deuteranopia and tritanopia on a color, or on a text/background pair with the contrast that remains.

Compare two countries: size ratio, border crossings between them, shared currency and language, driving side, distance.

Resize a decal or print to a new width or height keeping proportions, with area, scale factor and material cost.

Binding strips and fabric yardage for a quilt from its size, strip width and fabric width, rounded up to 1/8 yard.

Resin needed to fill a rectangular or round mold: volume in ml and oz, waste allowance and parts A and B by mix ratio.

The 30 currencies the ECB publishes daily reference rates for, with codes and names. Use before calling other FX endpoints.

Convert an amount from one currency to another at the latest ECB reference rate, with the rate and fixing date.

ECB reference exchange rate on a past date (since 1999) and the change since then; weekends use the prior working day.

Biggest currency movers against a base over 7-180 days among the 30 ECB currencies, strongest and weakest.

Average, high, low and percentile rank of today's rate for a currency pair over 30-1095 days, with a rich/cheap verdict.

Currency pair move over 7-365 days: percent change, high, low, annualized volatility and where today sits in the range.