#1D518F
Closest named color: Dusk Blue (#26538D). oklch(43.5% 0.116 255), rgb(29, 81, 143).
Aa
White text reads best on this color (7.99:1).
About this color
#1D518F is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.116 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.011 away. White text reads best on it, at 7.99:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.62:1 |
| White text | 7.99:1 |
Values
| HEX | #1D518F |
| RGB | rgb(29, 81, 143) |
| HSL | hsl(213, 66%, 34%) |
| OKLCH | oklch(43.5% 0.116 255) |
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 #1D518F | 7.99:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #1D518F | 2.62:1 | Fails | Lc 16.7 | Dividers and decoration only |
| #1D518F text on white | 7.99:1 | AAA | Lc 87.3 | Fine for body text |
| #1D518F text on black | 2.62:1 | Fails | Lc -14.8 | 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 800.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C9DBF2
oklch(88.5% 0.037 254.6)
-
Step 300
300
#A4C3EC
oklch(80.9% 0.067 255.5)
-
Step 400
400
#71A3E3
oklch(70.6% 0.109 255)
-
Step 500
500
#4A8BDB
oklch(63.1% 0.138 254.8)
-
Step 600
600
#2B73C9
oklch(55.6% 0.151 255.2)
-
Step 700
700
#1D60AE
oklch(49.1% 0.141 255.2)
-
Step 800
800 (this color)
#1D518F
oklch(43.5% 0.116 255)
-
Step 900
900
#1C4270
oklch(37.7% 0.09 254.8)
-
Step 950
950
#122742
oklch(27.1% 0.057 255.5)
#1D518F 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) | #325691 | 0.026 |
| Deuteranopia (no green cones) | #1E4C8E | 0.014 |
| Tritanopia (no blue cones) | #006069 | 0.089 |
| Achromatopsia (no color) | #515151 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D518F
#1D518F
oklch(43.5% 0.116 255)
- #6E4800
#6E4800
oklch(43.4% 0.092 74.6)
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 #1D518F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.011
- Light Navy #155084 ΔE 0.020
- Cobalt #1E488F ΔE 0.026
- Deep Sea Blue #015482 ΔE 0.028
- Light Navy Blue #2E5A88 ΔE 0.036
- Denim Blue #3B5B92 ΔE 0.044
- Twilight Blue #0A437A ΔE 0.054
- Twilight #4E518B ΔE 0.056
Use #1D518F 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.