#1D548B
Closest named color: Dusk Blue (#26538D). oklch(43.9% 0.107 251.7), rgb(29, 84, 139).
Aa
White text reads best on this color (7.79:1).
About this color
#1D548B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.107 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.008 away. White text reads best on it, at 7.79:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.69:1 |
| White text | 7.79:1 |
Values
| HEX | #1D548B |
| RGB | rgb(29, 84, 139) |
| HSL | hsl(210, 65%, 33%) |
| OKLCH | oklch(43.9% 0.107 251.7) |
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 #1D548B | 7.79:1 | AAA | Lc -91.5 | Preferred for body text |
| Black text on #1D548B | 2.69:1 | Fails | Lc 17.3 | Dividers and decoration only |
| #1D548B text on white | 7.79:1 | AAA | Lc 86.7 | Fine for body text |
| #1D548B text on black | 2.69:1 | Fails | Lc -15.4 | 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
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C9DBF0
oklch(88.4% 0.035 252.3)
-
Step 300
300
#A4C4E9
oklch(80.9% 0.063 252.3)
-
Step 400
400
#71A5DD
oklch(70.8% 0.099 251.1)
-
Step 500
500
#498DD4
oklch(63.1% 0.128 251.4)
-
Step 600
600
#2975C1
oklch(55.5% 0.139 251.9)
-
Step 700
700
#1A62A7
oklch(49% 0.13 251.8)
-
Step 800
800 (this color)
#1D548B
oklch(43.9% 0.107 251.7)
-
Step 900
900
#1C436C
oklch(37.7% 0.083 251.9)
-
Step 950
950
#11283F
oklch(27.1% 0.052 250.3)
#1D548B 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) | #3A588D | 0.032 |
| Deuteranopia (no green cones) | #294E8A | 0.018 |
| Tritanopia (no blue cones) | #006168 | 0.081 |
| Achromatopsia (no color) | #525252 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D548B
#1D548B
oklch(43.9% 0.107 251.7)
- #724800
#724800
oklch(43.9% 0.094 71.6)
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 #1D548B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.008
- Light Navy #155084 ΔE 0.017
- Deep Sea Blue #015482 ΔE 0.021
- Light Navy Blue #2E5A88 ΔE 0.026
- Cobalt #1E488F ΔE 0.036
- Denim Blue #3B5B92 ΔE 0.039
- Twilight #4E518B ΔE 0.055
- YInMn Blue #415A77 ΔE 0.055
Use #1D548B 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.