#203D7B
Closest named color: Twilight Blue (#0A437A). oklch(37.4% 0.111 263.2), rgb(32, 61, 123).
Aa
White text reads best on this color (10.42:1).
About this color
#203D7B is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.111 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.021 away. White text reads best on it, at 10.42:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.01:1 |
| White text | 10.42:1 |
Values
| HEX | #203D7B |
| RGB | rgb(32, 61, 123) |
| HSL | hsl(221, 59%, 30%) |
| OKLCH | oklch(37.4% 0.111 263.2) |
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 #203D7B | 10.42:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #203D7B | 2.01:1 | Fails | Lc 10.1 | Not readable |
| #203D7B text on white | 10.42:1 | AAA | Lc 93.9 | Preferred for body text |
| #203D7B text on black | 2.01:1 | Fails | Lc -8.7 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C9DAF9
oklch(88.5% 0.047 262.5)
-
Step 300
300
#A5C1F7
oklch(80.9% 0.083 263.3)
-
Step 400
400
#749FF4
oklch(70.8% 0.134 263)
-
Step 500
500
#5184EF
oklch(63.1% 0.17 263.2)
-
Step 600
600
#366BDE
oklch(55.7% 0.185 263.1)
-
Step 700
700
#2958C1
oklch(49.1% 0.173 263.3)
-
Step 800
800
#23499C
oklch(42.8% 0.142 263.2)
-
Step 900
900 (this color)
#203D7B
oklch(37.4% 0.111 263.2)
-
Step 950
950
#142548
oklch(27.1% 0.069 263.1)
#203D7B 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) | #1B447D | 0.020 |
| Deuteranopia (no green cones) | #013C7A | 0.022 |
| Tritanopia (no blue cones) | #004C56 | 0.090 |
| Achromatopsia (no color) | #404040 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #203D7B
#203D7B
oklch(37.4% 0.111 263.2)
- #543C00
#543C00
oklch(37.3% 0.077 83.1)
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 #203D7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.021
- Marine Blue #01386A ΔE 0.041
- Cobalt #1E488F ΔE 0.043
- Light Navy #155084 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.063
- Prussian Blue #1D3557 ΔE 0.064
- Deep Sea Blue #015482 ΔE 0.066
- Dark Grey Blue #29465B ΔE 0.068
Use #203D7B 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.