#1D508B
Closest named color: Dusk Blue (#26538D). oklch(43% 0.112 254.4), rgb(29, 80, 139).
Aa
White text reads best on this color (8.16:1).
About this color
#1D508B is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.112 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.013 away. White text reads best on it, at 8.16:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.57:1 |
| White text | 8.16:1 |
Values
| HEX | #1D508B |
| RGB | rgb(29, 80, 139) |
| HSL | hsl(212, 65%, 33%) |
| OKLCH | oklch(43% 0.112 254.4) |
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 #1D508B | 8.16:1 | AAA | Lc -92.5 | Preferred for body text |
| Black text on #1D508B | 2.57:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #1D508B text on white | 8.16:1 | AAA | Lc 87.9 | Fine for body text |
| #1D508B text on black | 2.57:1 | Fails | Lc -14.3 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#C9DBF1
oklch(88.5% 0.036 253.5)
-
Step 300
300
#A4C3EB
oklch(80.8% 0.066 254.9)
-
Step 400
400
#72A4E1
oklch(70.8% 0.105 254)
-
Step 500
500
#4C8BD8
oklch(63% 0.134 254.6)
-
Step 600
600
#2D74C6
oklch(55.7% 0.145 254.4)
-
Step 700
700
#1F61AB
oklch(49.2% 0.135 254.3)
-
Step 800
800 (this color)
#1D508B
oklch(43% 0.112 254.4)
-
Step 900
900
#1D426E
oklch(37.6% 0.087 254.4)
-
Step 950
950
#122741
oklch(27% 0.056 254.8)
#1D508B 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) | #33558D | 0.027 |
| Deuteranopia (no green cones) | #204B8A | 0.014 |
| Tritanopia (no blue cones) | #005E66 | 0.086 |
| Achromatopsia (no color) | #4F4F4F | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D508B
#1D508B
oklch(43% 0.112 254.4)
- #6D4700
#6D4700
oklch(43% 0.091 74.3)
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 #1D508B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.013
- Light Navy #155084 ΔE 0.013
- Deep Sea Blue #015482 ΔE 0.024
- Cobalt #1E488F ΔE 0.025
- Light Navy Blue #2E5A88 ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.047
- Twilight Blue #0A437A ΔE 0.049
- Twilight #4E518B ΔE 0.057
Use #1D508B 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.