#203F6E
Closest named color: Twilight Blue (#0A437A). oklch(37% 0.089 258.5), rgb(32, 63, 110).
Aa
White text reads best on this color (10.51:1).
About this color
#203F6E is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.089 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.024 away. White text reads best on it, at 10.51:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.99:1 |
| White text | 10.51:1 |
Values
| HEX | #203F6E |
| RGB | rgb(32, 63, 110) |
| HSL | hsl(216, 55%, 28%) |
| OKLCH | oklch(37% 0.089 258.5) |
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 #203F6E | 10.51:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #203F6E | 1.99:1 | Fails | Lc 9.8 | Not readable |
| #203F6E text on white | 10.51:1 | AAA | Lc 94.2 | Preferred for body text |
| #203F6E text on black | 1.99:1 | Fails | Lc -8.4 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A7C2EC
oklch(80.8% 0.067 259.1)
-
Step 400
400
#77A2E3
oklch(70.7% 0.107 258.4)
-
Step 500
500
#5389DB
oklch(63.1% 0.137 258.5)
-
Step 600
600
#3771C9
oklch(55.6% 0.15 258.7)
-
Step 700
700
#2A5EAD
oklch(49% 0.138 258.7)
-
Step 800
800
#244D8C
oklch(42.6% 0.114 258.8)
-
Step 900
900 (this color)
#203F6E
oklch(37% 0.089 258.5)
-
Step 950
950
#142642
oklch(26.9% 0.058 258.9)
#203F6E 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) | #294370 | 0.017 |
| Deuteranopia (no green cones) | #1D3C6D | 0.010 |
| Tritanopia (no blue cones) | #004A51 | 0.072 |
| Achromatopsia (no color) | #3F3F3F | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #203F6E
#203F6E
oklch(37% 0.089 258.5)
- #553A00
#553A00
oklch(37% 0.077 79.3)
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 #203F6E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.024
- Marine Blue #01386A ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.045
- Prussian Blue #1D3557 ΔE 0.047
- Light Navy #155084 ΔE 0.057
- Dark Blue Grey #1F3B4D ΔE 0.057
- Charcoal #264653 ΔE 0.057
- Cobalt #1E488F ΔE 0.058
Use #203F6E 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.