#21588E
Closest named color: Dusk Blue (#26538D). oklch(45.2% 0.105 251), rgb(33, 88, 142).
Aa
White text reads best on this color (7.36:1).
About this color
#21588E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.105 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.014 away. White text reads best on it, at 7.36:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.85:1 |
| White text | 7.36:1 |
Values
| HEX | #21588E |
| RGB | rgb(33, 88, 142) |
| HSL | hsl(210, 62%, 34%) |
| OKLCH | oklch(45.2% 0.105 251) |
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 #21588E | 7.36:1 | AAA | Lc -90.1 | Preferred for body text |
| Black text on #21588E | 2.85:1 | Fails | Lc 18.8 | Dividers and decoration only |
| #21588E text on white | 7.36:1 | AAA | Lc 85.3 | Fine for body text |
| #21588E text on black | 2.85:1 | Fails | Lc -16.8 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C9DBF0
oklch(88.4% 0.035 252.3)
-
Step 300
300
#A4C4E8
oklch(80.9% 0.062 251.6)
-
Step 400
400
#71A5DC
oklch(70.7% 0.098 250.7)
-
Step 500
500
#498DD3
oklch(63.1% 0.127 251.1)
-
Step 600
600
#2876C0
oklch(55.6% 0.137 250.9)
-
Step 700
700
#1A63A6
oklch(49.2% 0.127 250.9)
-
Step 800
800 (this color)
#21588E
oklch(45.2% 0.105 251)
-
Step 900
900
#1C436B
oklch(37.6% 0.082 251.4)
-
Step 950
950
#11283F
oklch(27.1% 0.052 250.3)
#21588E 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) | #3F5B90 | 0.032 |
| Deuteranopia (no green cones) | #2F518D | 0.022 |
| Tritanopia (no blue cones) | #00656C | 0.079 |
| Achromatopsia (no color) | #565656 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21588E
#21588E
oklch(45.2% 0.105 251)
- #774B00
#774B00
oklch(45.2% 0.097 71.2)
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 #21588E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.014
- Light Navy Blue #2E5A88 ΔE 0.017
- Denim Blue #3B5B92 ΔE 0.028
- Deep Sea Blue #015482 ΔE 0.029
- Light Navy #155084 ΔE 0.030
- Peacock Blue #016795 ΔE 0.043
- Denim #3B638C ΔE 0.044
- Cobalt #1E488F ΔE 0.047
Use #21588E 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.