#21507D
Closest named color: Light Navy (#155084). oklch(42.2% 0.091 250), rgb(33, 80, 125).
Aa
White text reads best on this color (8.37:1).
About this color
#21507D is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.091 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy (#155084), ΔE 0.014 away. White text reads best on it, at 8.37:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Light Navy (#155084) |
| Black text | 2.50:1 |
| White text | 8.37:1 |
Values
| HEX | #21507D |
| RGB | rgb(33, 80, 125) |
| HSL | hsl(209, 58%, 31%) |
| OKLCH | oklch(42.2% 0.091 250) |
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 #21507D | 8.37:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #21507D | 2.50:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #21507D text on white | 8.37:1 | AAA | Lc 88.6 | Fine for body text |
| #21507D text on black | 2.50:1 | Fails | Lc -13.6 | Not readable |
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
#CBDBEC
oklch(88.5% 0.029 249.8)
-
Step 300
300
#A7C4E2
oklch(80.9% 0.053 249.4)
-
Step 400
400
#77A5D4
oklch(70.7% 0.085 249.6)
-
Step 500
500
#538EC9
oklch(63.2% 0.109 249.9)
-
Step 600
600
#3677B5
oklch(55.6% 0.117 249.8)
-
Step 700
700
#28649C
oklch(49.2% 0.109 249.7)
-
Step 800
800 (this color)
#21507D
oklch(42.2% 0.091 250)
-
Step 900
900
#224466
oklch(37.8% 0.071 250.2)
-
Step 950
950
#14283C
oklch(27.1% 0.046 249.9)
#21507D 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) | #3C527F | 0.031 |
| Deuteranopia (no green cones) | #2F4A7C | 0.020 |
| Tritanopia (no blue cones) | #005B60 | 0.070 |
| Achromatopsia (no color) | #4E4E4E | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21507D
#21507D
oklch(42.2% 0.091 250)
- #6D4301
#6D4301
oklch(42.2% 0.091 69.5)
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 #21507D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy #155084 ΔE 0.014
- Deep Sea Blue #015482 ΔE 0.018
- Dusk Blue #26538D ΔE 0.028
- Light Navy Blue #2E5A88 ΔE 0.037
- Cobalt #1E488F ΔE 0.041
- Twilight Blue #0A437A ΔE 0.045
- YInMn Blue #415A77 ΔE 0.051
- Denim Blue #3B5B92 ΔE 0.055
Use #21507D 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.