#213F81
Closest named color: Twilight Blue (#0A437A). oklch(38.4% 0.117 263.5), rgb(33, 63, 129).
Aa
White text reads best on this color (10.03:1).
About this color
#213F81 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.117 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 10.03:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.09:1 |
| White text | 10.03:1 |
Values
| HEX | #213F81 |
| RGB | rgb(33, 63, 129) |
| HSL | hsl(221, 59%, 32%) |
| OKLCH | oklch(38.4% 0.117 263.5) |
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 #213F81 | 10.03:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #213F81 | 2.09:1 | Fails | Lc 11.0 | Not readable |
| #213F81 text on white | 10.03:1 | AAA | Lc 92.9 | Preferred for body text |
| #213F81 text on black | 2.09:1 | Fails | Lc -9.5 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C9DAFA
oklch(88.6% 0.048 263.1)
-
Step 300
300
#A3C1FA
oklch(80.9% 0.087 263)
-
Step 400
400
#729EF8
oklch(70.7% 0.141 263.5)
-
Step 500
500
#4E83F5
oklch(63.2% 0.18 263.4)
-
Step 600
600
#3369E3
oklch(55.6% 0.195 263.4)
-
Step 700
700
#2656C6
oklch(49% 0.183 263.5)
-
Step 800
800
#2147A0
oklch(42.6% 0.151 263.7)
-
Step 900
900 (this color)
#213F81
oklch(38.4% 0.117 263.5)
-
Step 950
950
#13244A
oklch(26.9% 0.074 264)
#213F81 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) | #194783 | 0.022 |
| Deuteranopia (no green cones) | #003E80 | 0.022 |
| Tritanopia (no blue cones) | #004F5A | 0.094 |
| Achromatopsia (no color) | #424242 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #213F81
#213F81
oklch(38.4% 0.117 263.5)
- #573F00
#573F00
oklch(38.4% 0.079 84.1)
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 #213F81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Cobalt #1E488F ΔE 0.032
- Light Navy #155084 ΔE 0.048
- Marine Blue #01386A ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.057
- Dusk Blue #26538D ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.061
- Blueberry #464196 ΔE 0.062
Use #213F81 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.