#203F7B
Closest named color: Twilight Blue (#0A437A). oklch(37.9% 0.109 262), rgb(32, 63, 123).
Aa
White text reads best on this color (10.20:1).
About this color
#203F7B is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.109 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.018 away. White text reads best on it, at 10.20:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.05:1 |
| White text | 10.20:1 |
Values
| HEX | #203F7B |
| RGB | rgb(32, 63, 123) |
| HSL | hsl(220, 59%, 30%) |
| OKLCH | oklch(37.9% 0.109 262) |
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 #203F7B | 10.20:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #203F7B | 2.05:1 | Fails | Lc 10.6 | Not readable |
| #203F7B text on white | 10.20:1 | AAA | Lc 93.4 | Preferred for body text |
| #203F7B text on black | 2.05:1 | Fails | Lc -9.1 | 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
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C9DAF8
oklch(88.5% 0.045 261.9)
-
Step 300
300
#A4C1F6
oklch(80.8% 0.082 262.3)
-
Step 400
400
#739FF2
oklch(70.6% 0.131 262.3)
-
Step 500
500
#4F85ED
oklch(63.1% 0.167 262.1)
-
Step 600
600
#336CDB
oklch(55.6% 0.181 261.9)
-
Step 700
700
#2659BE
oklch(49% 0.168 262.1)
-
Step 800
800
#214A9A
oklch(42.8% 0.139 262)
-
Step 900
900 (this color)
#203F7B
oklch(37.9% 0.109 262)
-
Step 950
950
#132548
oklch(27% 0.069 262.3)
#203F7B 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) | #1F467D | 0.020 |
| Deuteranopia (no green cones) | #0A3D7A | 0.018 |
| Tritanopia (no blue cones) | #004D57 | 0.086 |
| Achromatopsia (no color) | #414141 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #203F7B
#203F7B
oklch(37.9% 0.109 262)
- #573D00
#573D00
oklch(37.9% 0.078 81.4)
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 #203F7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.018
- Cobalt #1E488F ΔE 0.040
- Marine Blue #01386A ΔE 0.044
- Light Navy #155084 ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.062
- Dusk Blue #26538D ΔE 0.063
- Dark Grey Blue #29465B ΔE 0.064
Use #203F7B 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.