#1C3A7F
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.122 263.7), rgb(28, 58, 127).
Aa
White text reads best on this color (10.70:1).
About this color
#1C3A7F is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.122 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.029 away. White text reads best on it, at 10.70:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.70:1 |
Values
| HEX | #1C3A7F |
| RGB | rgb(28, 58, 127) |
| HSL | hsl(222, 64%, 30%) |
| OKLCH | oklch(36.9% 0.122 263.7) |
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 #1C3A7F | 10.70:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #1C3A7F | 1.96:1 | Fails | Lc 9.5 | Not readable |
| #1C3A7F text on white | 10.70:1 | AAA | Lc 94.4 | Preferred for body text |
| #1C3A7F text on black | 1.96:1 | Fails | Lc -8.2 | 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
#C8DAFC
oklch(88.6% 0.051 263.2)
-
Step 300
300
#A2C1FD
oklch(81% 0.092 263.3)
-
Step 400
400
#719EFC
oklch(70.8% 0.147 263.7)
-
Step 500
500
#4C82F9
oklch(63.1% 0.187 263.6)
-
Step 600
600
#3167E8
oklch(55.5% 0.204 263.8)
-
Step 700
700
#2455CA
oklch(49.1% 0.19 263.7)
-
Step 800
800
#1F46A3
oklch(42.6% 0.157 263.8)
-
Step 900
900 (this color)
#1C3A7F
oklch(36.9% 0.122 263.7)
-
Step 950
950
#12244C
oklch(27% 0.078 263.8)
#1C3A7F 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) | #094381 | 0.026 |
| Deuteranopia (no green cones) | #003A7E | 0.018 |
| Tritanopia (no blue cones) | #004B56 | 0.098 |
| Achromatopsia (no color) | #3E3E3E | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C3A7F
#1C3A7F
oklch(36.9% 0.122 263.7)
- #523B00
#523B00
oklch(36.8% 0.076 83.9)
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 #1C3A7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.029
- Marine Blue #01386A ΔE 0.042
- Cobalt #1E488F ΔE 0.046
- Light Navy #155084 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.066
- Marine #042E60 ΔE 0.068
- Prussian Blue #1D3557 ΔE 0.069
- Blueberry #464196 ΔE 0.073
Use #1C3A7F 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.