#213D6B
Closest named color: Twilight Blue (#0A437A). oklch(36.3% 0.087 259.8), rgb(33, 61, 107).
Aa
White text reads best on this color (10.79:1).
About this color
#213D6B is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.087 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.030 away. White text reads best on it, at 10.79:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.79:1 |
Values
| HEX | #213D6B |
| RGB | rgb(33, 61, 107) |
| HSL | hsl(217, 53%, 27%) |
| OKLCH | oklch(36.3% 0.087 259.8) |
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 #213D6B | 10.79:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #213D6B | 1.94:1 | Fails | Lc 9.1 | Not readable |
| #213D6B text on white | 10.79:1 | AAA | Lc 94.8 | Preferred for body text |
| #213D6B text on black | 1.94:1 | Fails | Lc -7.8 | 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 900.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A8C2EB
oklch(80.9% 0.065 259.4)
-
Step 400
400
#7AA1E2
oklch(70.7% 0.105 260.3)
-
Step 500
500
#5889D9
oklch(63.2% 0.132 259.8)
-
Step 600
600
#3D71C7
oklch(55.7% 0.145 259.9)
-
Step 700
700
#2F5EAC
oklch(49.1% 0.135 260)
-
Step 800
800
#284D8B
oklch(42.7% 0.111 260.1)
-
Step 900
900 (this color)
#213D6B
oklch(36.3% 0.087 259.8)
-
Step 950
950
#162641
oklch(27% 0.055 260.3)
#213D6B 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) | #28416D | 0.016 |
| Deuteranopia (no green cones) | #1D3A6A | 0.011 |
| Tritanopia (no blue cones) | #00484E | 0.073 |
| Achromatopsia (no color) | #3D3D3D | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #213D6B
#213D6B
oklch(36.3% 0.087 259.8)
- #533900
#533900
oklch(36.5% 0.076 80)
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 #213D6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.030
- Marine Blue #01386A ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.053
- Charcoal #264653 ΔE 0.057
- Marine #042E60 ΔE 0.058
- Midnight Green #073B4C ΔE 0.061
Use #213D6B 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.