#1C3F7D
Closest named color: Twilight Blue (#0A437A). oklch(37.9% 0.113 260.8), rgb(28, 63, 125).
Aa
White text reads best on this color (10.21:1).
About this color
#1C3F7D is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.113 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.016 away. White text reads best on it, at 10.21:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.05:1 |
| White text | 10.21:1 |
Values
| HEX | #1C3F7D |
| RGB | rgb(28, 63, 125) |
| HSL | hsl(218, 63%, 30%) |
| OKLCH | oklch(37.9% 0.113 260.8) |
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 #1C3F7D | 10.21:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #1C3F7D | 2.05:1 | Fails | Lc 10.6 | Not readable |
| #1C3F7D text on white | 10.21:1 | AAA | Lc 93.3 | Preferred for body text |
| #1C3F7D text on black | 2.05:1 | Fails | Lc -9.2 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAF9
oklch(88.5% 0.047 261.4)
-
Step 300
300
#A2C2F8
oklch(81% 0.084 260.7)
-
Step 400
400
#6FA0F5
oklch(70.8% 0.136 260.8)
-
Step 500
500
#4985F0
oklch(63% 0.173 261)
-
Step 600
600
#2B6CDF
oklch(55.6% 0.188 260.9)
-
Step 700
700
#1E59C2
oklch(49.1% 0.176 261)
-
Step 800
800
#1B4A9D
oklch(42.8% 0.145 260.8)
-
Step 900
900 (this color)
#1C3F7D
oklch(37.9% 0.113 260.8)
-
Step 950
950
#112549
oklch(27% 0.072 261.1)
#1C3F7D 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) | #1D467F | 0.021 |
| Deuteranopia (no green cones) | #013D7C | 0.019 |
| Tritanopia (no blue cones) | #004E58 | 0.089 |
| Achromatopsia (no color) | #414141 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C3F7D
#1C3F7D
oklch(37.9% 0.113 260.8)
- #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 #1C3F7D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.016
- Cobalt #1E488F ΔE 0.038
- Marine Blue #01386A ΔE 0.044
- Light Navy #155084 ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.061
- Dusk Blue #26538D ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.064
- Dark Grey Blue #29465B ΔE 0.068
Use #1C3F7D 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.