#1D3D6D
Closest named color: Twilight Blue (#0A437A). oklch(36.3% 0.091 258.4), rgb(29, 61, 109).
Aa
White text reads best on this color (10.82:1).
About this color
#1D3D6D is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.091 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 10.82:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.82:1 |
Values
| HEX | #1D3D6D |
| RGB | rgb(29, 61, 109) |
| HSL | hsl(216, 58%, 27%) |
| OKLCH | oklch(36.3% 0.091 258.4) |
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 #1D3D6D | 10.82:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #1D3D6D | 1.94:1 | Fails | Lc 9.1 | Not readable |
| #1D3D6D text on white | 10.82:1 | AAA | Lc 94.8 | Preferred for body text |
| #1D3D6D text on black | 1.94:1 | Fails | Lc -7.8 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADAF3
oklch(88.4% 0.039 259.3)
-
Step 300
300
#A6C2ED
oklch(80.8% 0.068 258.9)
-
Step 400
400
#76A2E5
oklch(70.8% 0.11 258.6)
-
Step 500
500
#5189DD
oklch(63.1% 0.14 258.3)
-
Step 600
600
#3571CB
oklch(55.6% 0.153 258.5)
-
Step 700
700
#275EAF
oklch(49% 0.142 258.4)
-
Step 800
800
#224D8E
oklch(42.6% 0.118 258.6)
-
Step 900
900 (this color)
#1D3D6D
oklch(36.3% 0.091 258.4)
-
Step 950
950
#142642
oklch(26.9% 0.058 258.9)
#1D3D6D 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) | #26416F | 0.017 |
| Deuteranopia (no green cones) | #193A6C | 0.011 |
| Tritanopia (no blue cones) | #00484F | 0.073 |
| Achromatopsia (no color) | #3D3D3D | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3D6D
#1D3D6D
oklch(36.3% 0.091 258.4)
- #533800
#533800
oklch(36.3% 0.075 78.5)
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 #1D3D6D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Marine Blue #01386A ΔE 0.027
- Prussian Blue #1D3557 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.056
- Marine #042E60 ΔE 0.056
- Charcoal #264653 ΔE 0.060
- Midnight Green #073B4C ΔE 0.062
Use #1D3D6D 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.