#255584
Closest named color: Dusk Blue (#26538D). oklch(44% 0.094 250.4), rgb(37, 85, 132).
Aa
White text reads best on this color (7.74:1).
About this color
#255584 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.094 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.017 away. White text reads best on it, at 7.74:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.71:1 |
| White text | 7.74:1 |
Values
| HEX | #255584 |
| RGB | rgb(37, 85, 132) |
| HSL | hsl(210, 56%, 33%) |
| OKLCH | oklch(44% 0.094 250.4) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #255584 | 7.74:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #255584 | 2.71:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #255584 text on white | 7.74:1 | AAA | Lc 86.6 | Fine for body text |
| #255584 text on black | 2.71:1 | Fails | Lc -15.4 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CBDBED
oklch(88.5% 0.03 251.3)
-
Step 300
300
#A7C4E3
oklch(80.9% 0.054 250.2)
-
Step 400
400
#76A5D6
oklch(70.7% 0.088 250.2)
-
Step 500
500
#528ECB
oklch(63.3% 0.112 250.4)
-
Step 600
600
#3477B7
oklch(55.7% 0.121 250)
-
Step 700
700
#26639E
oklch(49% 0.113 250.7)
-
Step 800
800 (this color)
#255584
oklch(44% 0.094 250.4)
-
Step 900
900
#214467
oklch(37.8% 0.073 250.3)
-
Step 950
950
#14283C
oklch(27.1% 0.046 249.9)
#255584 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #405786 | 0.031 |
| Deuteranopia (no green cones) | #324F83 | 0.020 |
| Tritanopia (no blue cones) | #006066 | 0.071 |
| Achromatopsia (no color) | #535353 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255584
#255584
oklch(44% 0.094 250.4)
- #734803
#734803
oklch(44.1% 0.094 70.3)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #255584, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.017
- Light Navy Blue #2E5A88 ΔE 0.019
- Deep Sea Blue #015482 ΔE 0.020
- Light Navy #155084 ΔE 0.021
- Denim Blue #3B5B92 ΔE 0.038
- YInMn Blue #415A77 ΔE 0.042
- Cobalt #1E488F ΔE 0.046
- Dusk #4E5481 ΔE 0.048
Use #255584 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.