#1C3B7C
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.117 262.8), rgb(28, 59, 124).
Aa
White text reads best on this color (10.68:1).
About this color
#1C3B7C is a dark, moderately saturated blue. In OKLCH its lightness is 37%, 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 0.025 away. White text reads best on it, at 10.68:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.68:1 |
Values
| HEX | #1C3B7C |
| RGB | rgb(28, 59, 124) |
| HSL | hsl(221, 63%, 30%) |
| OKLCH | oklch(36.9% 0.117 262.8) |
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 #1C3B7C | 10.68:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #1C3B7C | 1.96:1 | Fails | Lc 9.5 | Not readable |
| #1C3B7C text on white | 10.68:1 | AAA | Lc 94.4 | Preferred for body text |
| #1C3B7C 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
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAFA
oklch(88.5% 0.048 262)
-
Step 300
300
#A3C1FA
oklch(80.9% 0.087 263)
-
Step 400
400
#719EF8
oklch(70.6% 0.141 263.1)
-
Step 500
500
#4C83F4
oklch(63% 0.179 262.8)
-
Step 600
600
#316AE3
oklch(55.7% 0.194 262.8)
-
Step 700
700
#2457C5
oklch(49.1% 0.181 262.8)
-
Step 800
800
#1F489F
oklch(42.7% 0.149 262.8)
-
Step 900
900 (this color)
#1C3B7C
oklch(36.9% 0.117 262.8)
-
Step 950
950
#12244A
oklch(26.9% 0.075 263.2)
#1C3B7C 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) | #13437E | 0.023 |
| Deuteranopia (no green cones) | #003A7B | 0.019 |
| Tritanopia (no blue cones) | #004B55 | 0.094 |
| Achromatopsia (no color) | #3E3E3E | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C3B7C
#1C3B7C
oklch(36.9% 0.117 262.8)
- #533B00
#533B00
oklch(36.9% 0.076 82.8)
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 #1C3B7C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.025
- Marine Blue #01386A ΔE 0.039
- Cobalt #1E488F ΔE 0.047
- Light Navy #155084 ΔE 0.061
- Prussian Blue #1D3557 ΔE 0.065
- Marine #042E60 ΔE 0.066
- Dark Slate Blue #483D8B ΔE 0.067
- Deep Sea Blue #015482 ΔE 0.072
Use #1C3B7C 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.