#1D3184
Closest named color: Twilight Blue (#0A437A). oklch(35.5% 0.141 267.9), rgb(29, 49, 132).
Aa
White text reads best on this color (11.50:1).
About this color
#1D3184 is a dark, vivid blue. In OKLCH its lightness is 35%, its chroma 0.141 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.053 away. White text reads best on it, at 11.50:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.82:1 |
| White text | 11.50:1 |
Values
| HEX | #1D3184 |
| RGB | rgb(29, 49, 132) |
| HSL | hsl(228, 64%, 32%) |
| OKLCH | oklch(35.5% 0.141 267.9) |
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 #1D3184 | 11.50:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #1D3184 | 1.82:1 | Fails | Lc 7.9 | Not readable |
| #1D3184 text on white | 11.50:1 | AAA | Lc 96.0 | Preferred for body text |
| #1D3184 text on black | 1.82:1 | Fails | Lc 0.0 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A6BFFF
oklch(80.9% 0.095 267.8)
-
Step 400
400
#789BFF
oklch(70.8% 0.152 267.9)
-
Step 500
500
#577DFF
oklch(63.1% 0.197 268)
-
Step 600
600
#3B5DFA
oklch(55.5% 0.236 268)
-
Step 700
700
#2E4BDA
oklch(49% 0.219 267.8)
-
Step 800
800
#263FB0
oklch(42.7% 0.181 267.8)
-
Step 900
900 (this color)
#1D3184
oklch(35.5% 0.141 267.9)
-
Step 950
950
#142251
oklch(27.1% 0.088 267.6)
#1D3184 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) | #003E87 | 0.035 |
| Deuteranopia (no green cones) | #003582 | 0.021 |
| Tritanopia (no blue cones) | #004655 | 0.111 |
| Achromatopsia (no color) | #393939 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3184
#1D3184
oklch(35.5% 0.141 267.9)
- #4C3900
#4C3900
oklch(35.6% 0.073 87.6)
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 #1D3184, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.053
- Marine Blue #01386A ΔE 0.053
- Royal #0C1793 ΔE 0.060
- Cobalt #1E488F ΔE 0.064
- Midnight Blue #191970 ΔE 0.068
- Sapphire #2138AB ΔE 0.068
- Marine #042E60 ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.075
Use #1D3184 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.