#1D539E
Closest named color: Dusk Blue (#26538D). oklch(45% 0.134 257.7), rgb(29, 83, 158).
Aa
White text reads best on this color (7.54:1).
About this color
#1D539E is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.134 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.028 away. White text reads best on it, at 7.54:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.78:1 |
| White text | 7.54:1 |
Values
| HEX | #1D539E |
| RGB | rgb(29, 83, 158) |
| HSL | hsl(215, 69%, 37%) |
| OKLCH | oklch(45% 0.134 257.7) |
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 #1D539E | 7.54:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #1D539E | 2.78:1 | Fails | Lc 18.2 | Dividers and decoration only |
| #1D539E text on white | 7.54:1 | AAA | Lc 85.8 | Fine for body text |
| #1D539E text on black | 2.78:1 | Fails | Lc -16.3 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF7
oklch(88.6% 0.044 258)
-
Step 300
300
#A1C3F4
oklch(81% 0.079 257.5)
-
Step 400
400
#6DA2EE
oklch(70.7% 0.126 257.4)
-
Step 500
500
#4588E9
oklch(63.1% 0.161 257.9)
-
Step 600
600
#2470D7
oklch(55.7% 0.174 257.6)
-
Step 700
700
#165DBA
oklch(49.1% 0.162 257.6)
-
Step 800
800 (this color)
#1D539E
oklch(45% 0.134 257.7)
-
Step 900
900
#194078
oklch(37.6% 0.105 257.9)
-
Step 950
950
#102646
oklch(27% 0.066 257.9)
#1D539E 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) | #2A5AA1 | 0.024 |
| Deuteranopia (no green cones) | #034F9D | 0.018 |
| Tritanopia (no blue cones) | #006571 | 0.102 |
| Achromatopsia (no color) | #545454 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D539E
#1D539E
oklch(45% 0.134 257.7)
- #724D00
#724D00
oklch(45% 0.094 77)
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 #1D539E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.028
- Cobalt #1E488F ΔE 0.037
- Light Navy #155084 ΔE 0.044
- Denim Blue #3B5B92 ΔE 0.044
- Light Navy Blue #2E5A88 ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.050
- Blueberry #464196 ΔE 0.060
- Twilight #4E518B ΔE 0.060
Use #1D539E 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.