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Strong Vala Indigo

#583bcb
Notes

Strong Vala Indigo (#583BCB) is a true indigo with a cool character. It leans cool, sitting on the blue, green, and violet side of the wheel. Quiet and dependable, a fit for product UI and data visualization. Its HSL profile (252°, 58%, 51%) places it in the balanced band at a mid lightness. It works across type, buttons, and borders, saturated enough to feel deliberate but balanced enough to not fight the rest of the palette. For a confident two-color system, pair it with its complementary yellow. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#583bcb
RGB
rgb(88, 59, 203)
HSL
hsl(252, 58%, 51%)
HWB
hwb(252 23% 20%)
OKLCH
oklch(47.8% 0.209 284.5)
P3
color(display-p3 0.3283 0.2362 0.7665)
HSV
hsv(252, 71%, 80%)
LAB
lab(36.95% 49.91 -70.32)
LCH
lch(36.95% 86.23 305.36)
CMYK
cmyk(57%, 71%, 0%, 20%)

Etymology

Strong
adjective

Old English strang, firm, vigorous — applied to color since the sixteenth century. Strong red, strong tea: a color at full strength is the maximum saturation the medium can produce. Sits at the saturated mid corner of the grid, parallel to bold in usage but slightly more focused on pigment density than on assertion.

Vala
modifier

Old Norse völva, Norse-seeress-and-staff-bearer. As a color modifier, vala implies a Norse-seeress-and-staff-bearer-and-prophetess quality, the visual register of Norse-vala-seeress-and-staff hand-Norse-seeress-and-staff-bearer-and-prophetess Norse-vala-seeress-and-staff-and-Voluspa-Edda vala-and-Norse-seeress-and-staff-bearer surfaces under Norse-vala-seeress-and-staff-and-Voluspa-Edda Saga-Iceland-and-rune-stave seeress-prophecy-light. Sits at the modifier-and-myth end of the grid, parallel to norn and freya in usage.

Indigo
noun

Indigofera tinctoria, the South Asian legume whose leaves yield the deep blue dye that has clothed humanity for at least four thousand years — Egyptian linen, Mayan textile, the slave-grown plantations of Carolina. The color refers to a freshly indigo-dyed cotton thread: a saturated, slightly violet-shifted deep blue with the slight lustre of a fiber surface oxidized in air. Deeper than cobalt, cooler than royal.

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

Click any swatch to explore

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.

#583bcb
Original
#005bcf
Protanopia
#0052c8
Deuteranopia
#1d627f
Tritanopia
#4c4c4c
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).
AAAon White
7.23:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
Failon Black
2.90:1

Wide gamut

Display P3 representation

The CSS Color 4 wide-gamut form of this color. Both swatches render the same color on every display — the P3 form only diverges from sRGB when a designer pushes channels outside sRGB's reach.

sRGB hex
sRGB hex
##583BCB
Display P3
Display P3
color(display-p3 0.3283 0.2362 0.7665)
P3 has visible headroomOKLCH chroma 0.209

This color is chromatic enough that authoring it as P3 native (instead of clamping to sRGB) gives a perceptibly more saturated render on wide-gamut displays — modern Macs, iPhones, iPads, and most recent OLED laptops.

Related Colors

Canvas