#21587D
Closest named color: Light Navy Blue (#2E5A88). oklch(44.2% 0.084 241.8), rgb(33, 88, 125).
Aa
White text reads best on this color (7.61:1).
About this color
#21587D is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.084 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.023 away. White text reads best on it, at 7.61:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.75:1 |
| White text | 7.61:1 |
Values
| HEX | #21587D |
| RGB | rgb(33, 88, 125) |
| HSL | hsl(204, 58%, 31%) |
| OKLCH | oklch(44.2% 0.084 241.8) |
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 #21587D | 7.61:1 | AAA | Lc -91.0 | Preferred for body text |
| Black text on #21587D | 2.75:1 | Fails | Lc 17.8 | Dividers and decoration only |
| #21587D text on white | 7.61:1 | AAA | Lc 86.2 | Fine for body text |
| #21587D text on black | 2.75:1 | Fails | Lc -15.9 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEA
oklch(88.5% 0.027 241.2)
-
Step 300
300
#A6C5DE
oklch(80.9% 0.049 242.6)
-
Step 400
400
#74A7CD
oklch(70.7% 0.078 241.4)
-
Step 500
500
#4D91C1
oklch(63.2% 0.1 241.5)
-
Step 600
600
#2D7AAD
oklch(55.6% 0.109 241.8)
-
Step 700
700
#1F6795
oklch(49.3% 0.101 241.7)
-
Step 800
800 (this color)
#21587D
oklch(44.2% 0.084 241.8)
-
Step 900
900
#1E4561
oklch(37.6% 0.065 242.5)
-
Step 950
950
#132939
oklch(27.1% 0.041 242)
#21587D 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) | #47597F | 0.041 |
| Deuteranopia (no green cones) | #3A507C | 0.032 |
| Tritanopia (no blue cones) | #006165 | 0.058 |
| Achromatopsia (no color) | #545454 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21587D
#21587D
oklch(44.2% 0.084 241.8)
- #74471C
#74471C
oklch(44.2% 0.084 61.1)
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 #21587D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.023
- Deep Sea Blue #015482 ΔE 0.023
- Light Navy #155084 ΔE 0.031
- Dusk Blue #26538D ΔE 0.034
- YInMn Blue #415A77 ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.045
- Petrol #005F6A ΔE 0.046
- Denim #3B638C ΔE 0.048
Use #21587D 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.