#1D588B
Closest named color: Dusk Blue (#26538D). oklch(44.9% 0.103 248.6), rgb(29, 88, 139).
Aa
White text reads best on this color (7.44:1).
About this color
#1D588B is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.103 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.016 away. White text reads best on it, at 7.44:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.82:1 |
| White text | 7.44:1 |
Values
| HEX | #1D588B |
| RGB | rgb(29, 88, 139) |
| HSL | hsl(208, 65%, 33%) |
| OKLCH | oklch(44.9% 0.103 248.6) |
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 #1D588B | 7.44:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #1D588B | 2.82:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #1D588B text on white | 7.44:1 | AAA | Lc 85.5 | Fine for body text |
| #1D588B text on black | 2.82:1 | Fails | Lc -16.5 | Dividers and decoration only |
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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C9DCEF
oklch(88.6% 0.033 248.2)
-
Step 300
300
#A3C5E6
oklch(81% 0.059 247.8)
-
Step 400
400
#70A6DA
oklch(70.8% 0.096 248.4)
-
Step 500
500
#478ED0
oklch(63% 0.123 248.9)
-
Step 600
600
#2477BD
oklch(55.6% 0.133 248.7)
-
Step 700
700
#1464A3
oklch(49.1% 0.124 248.4)
-
Step 800
800 (this color)
#1D588B
oklch(44.9% 0.103 248.6)
-
Step 900
900
#1A446A
oklch(37.7% 0.08 248.9)
-
Step 950
950
#10283E
oklch(27% 0.051 248.4)
#1D588B 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) | #405B8D | 0.036 |
| Deuteranopia (no green cones) | #30518A | 0.024 |
| Tritanopia (no blue cones) | #00646B | 0.074 |
| Achromatopsia (no color) | #555555 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D588B
#1D588B
oklch(44.9% 0.103 248.6)
- #784900
#784900
oklch(45% 0.098 68.4)
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 #1D588B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.016
- Light Navy Blue #2E5A88 ΔE 0.017
- Deep Sea Blue #015482 ΔE 0.024
- Light Navy #155084 ΔE 0.027
- Denim Blue #3B5B92 ΔE 0.033
- Peacock Blue #016795 ΔE 0.044
- Denim #3B638C ΔE 0.046
- YInMn Blue #415A77 ΔE 0.048
Use #1D588B 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.