#1B3C7D
Closest named color: Twilight Blue (#0A437A). oklch(37.1% 0.117 262.1), rgb(27, 60, 125).
Aa
White text reads best on this color (10.55:1).
About this color
#1B3C7D is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.117 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.022 away. White text reads best on it, at 10.55:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.98:1 |
| White text | 10.55:1 |
Values
| HEX | #1B3C7D |
| RGB | rgb(27, 60, 125) |
| HSL | hsl(220, 64%, 30%) |
| OKLCH | oklch(37.1% 0.117 262.1) |
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 #1B3C7D | 10.55:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #1B3C7D | 1.98:1 | Fails | Lc 9.8 | Not readable |
| #1B3C7D text on white | 10.55:1 | AAA | Lc 94.1 | Preferred for body text |
| #1B3C7D text on black | 1.98:1 | Fails | Lc -8.5 | 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
#A2C1FA
oklch(80.9% 0.088 262.4)
-
Step 400
400
#6F9FF8
oklch(70.7% 0.141 261.9)
-
Step 500
500
#4A84F4
oklch(63.1% 0.179 262)
-
Step 600
600
#2D6AE3
oklch(55.6% 0.195 262.1)
-
Step 700
700
#2057C5
oklch(49% 0.182 262.1)
-
Step 800
800
#1C48A0
oklch(42.7% 0.151 262.1)
-
Step 900
900 (this color)
#1B3C7D
oklch(37.1% 0.117 262.1)
-
Step 950
950
#11254A
oklch(27.1% 0.074 261.5)
#1B3C7D 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) | #14447F | 0.022 |
| Deuteranopia (no green cones) | #003B7C | 0.018 |
| Tritanopia (no blue cones) | #004C56 | 0.093 |
| Achromatopsia (no color) | #3F3F3F | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3C7D
#1B3C7D
oklch(37.1% 0.117 262.1)
- #543B00
#543B00
oklch(37.1% 0.076 81.7)
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 #1B3C7D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.022
- Marine Blue #01386A ΔE 0.040
- Cobalt #1E488F ΔE 0.044
- Light Navy #155084 ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.066
- Prussian Blue #1D3557 ΔE 0.066
- Marine #042E60 ΔE 0.068
- Deep Sea Blue #015482 ΔE 0.069
Use #1B3C7D 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.