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Frantic Niche Sky

#21a6e5
Notes

Frantic Niche Sky (#21A6E5) is a true cyan with a vibrant character. It holds its own as a focal accent, carrying visual weight without tipping into neon territory. Its HSL profile (199°, 79%, 51%) places it in the highly saturated band at a mid lightness. Best used in small doses, like logos, CTAs, focus rings, or highlight text, where its saturation becomes a feature rather than noise. For a confident two-color system, pair it with its complementary orange. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#21a6e5
RGB
rgb(33, 166, 229)
HSL
hsl(199, 79%, 51%)
HWB
hwb(199 13% 10%)
OKLCH
oklch(68.7% 0.140 236.2)
HSV
hsv(199, 86%, 90%)
LAB
lab(64.36% -12.12 -41.19)
LCH
lch(64.36% 42.93 253.61)
CMYK
cmyk(86%, 28%, 0%, 10%)

Etymology

Frantic
adjective

Greek phrenitikós, frenzied — adjectival suffix, sharing root with phrenitis (delirium). As a color modifier, frantic implies a saturated-and-rushed-and-overactive quality, the bright color of Memphis-Group 1980s-design over-the-top saturated visual-rhythm. Sits at the bright-and-active end of the grid, parallel to frenetic and manic in usage.

Niche
modifier

Italian nicchia, recess. As a color modifier, niche implies a wall-recess-for-statue-or-icon quality, the visual register of Roman-Catholic-and-Renaissance-niche hand-cut wall-recess-and-shell-shaped niche-for-statue-or-icon architectural surfaces under candle-and-niche-statue-and-icon devotional light. Sits at the modifier-and-architecture end of the grid, parallel to alcove and atrium in usage.

Sky
noun

The blue of a clear sky at noon — produced by Rayleigh scattering, the preferential dispersion of shorter wavelengths through atmospheric molecules. Air itself is colorless; the color we see is sunlight scattered toward our eyes by every cubic kilometer above. The reference shade is mid-latitude noon under a high pressure system: a clean, slightly green-shifted blue with the luminous depth of light scattered across an entire hemisphere of air.

Closest matches

The nearest named color in three reference sources, ranked by perceptual distance (ΔE76 in CIELAB). ΔE < 1 is imperceptible to most viewers; ΔE > 10 is clearly different. When two sources point to the same hex they’re merged into one tile; click any to open that color’s page.

Variations

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Harmonies

Accessibility

Color-vision simulation

How this color appears to viewers with the four major color-vision-deficiency types. Computed via the Machado (2009) physiologically-based model. If a tile matches the original, the color reads the same to that viewer.

#21a6e5
Original
#87a6e8
Protanopia
#6e94e4
Deuteranopia
#00b6bc
Tritanopia
#8e8e8e
Achromatopsia
WCAG contrast

The color used as foreground text against pure white and pure black, with the contrast ratio and WCAG 2.1 grade. Aim for AA (4.5:1) for body text and AA Large (3:1) for 18 pt+ headlines; AAA (7:1) is the gold standard for long-form reading surfaces.

The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
Failon White
2.74:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
AAAon Black
7.65:1

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