#1D3689
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.142 266.5), rgb(29, 54, 137).
Aa
White text reads best on this color (10.81:1).
About this color
#1D3689 is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.142 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.046 away. White text reads best on it, at 10.81:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.81:1 |
Values
| HEX | #1D3689 |
| RGB | rgb(29, 54, 137) |
| HSL | hsl(226, 65%, 33%) |
| OKLCH | oklch(36.9% 0.142 266.5) |
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 #1D3689 | 10.81:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #1D3689 | 1.94:1 | Fails | Lc 9.4 | Not readable |
| #1D3689 text on white | 10.81:1 | AAA | Lc 94.5 | Preferred for body text |
| #1D3689 text on black | 1.94:1 | Fails | Lc -8.1 | 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
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A4BFFF
oklch(80.8% 0.096 266.6)
-
Step 400
400
#759CFF
oklch(70.8% 0.151 266.4)
-
Step 500
500
#527EFF
oklch(63% 0.198 266.5)
-
Step 600
600
#345FFB
oklch(55.7% 0.236 266.4)
-
Step 700
700
#284CDB
oklch(49.1% 0.221 266.5)
-
Step 800
800
#2140B0
oklch(42.6% 0.181 266.4)
-
Step 900
900 (this color)
#1D3689
oklch(36.9% 0.142 266.5)
-
Step 950
950
#122252
oklch(27.1% 0.09 266.4)
#1D3689 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) | #00428C | 0.033 |
| Deuteranopia (no green cones) | #003887 | 0.019 |
| Tritanopia (no blue cones) | #004B5A | 0.111 |
| Achromatopsia (no color) | #3D3D3D | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3689
#1D3689
oklch(36.9% 0.142 266.5)
- #513C00
#513C00
oklch(36.9% 0.076 86.3)
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 #1D3689, closest first.
No curated palette has a color within ΔE 0.04 of #1D3689.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.046
- Cobalt #1E488F ΔE 0.049
- Sapphire #2138AB ΔE 0.057
- Marine Blue #01386A ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.066
- Royal #0C1793 ΔE 0.069
- Blueberry #464196 ΔE 0.070
- Light Navy #155084 ΔE 0.074
Use #1D3689 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.