#1D4577
Closest named color: Twilight Blue (#0A437A). oklch(38.9% 0.096 255.4), rgb(29, 69, 119).
Aa
White text reads best on this color (9.67:1).
About this color
#1D4577 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.096 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.015 away. White text reads best on it, at 9.67:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.16:1 |
| White text | 9.67:1 |
Values
| HEX | #1D4577 |
| RGB | rgb(29, 69, 119) |
| HSL | hsl(213, 61%, 29%) |
| OKLCH | oklch(38.9% 0.096 255.4) |
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 #1D4577 | 9.67:1 | AAA | Lc -96.4 | Preferred for body text |
| Black text on #1D4577 | 2.16:1 | Fails | Lc 11.8 | Not readable |
| #1D4577 text on white | 9.67:1 | AAA | Lc 92.1 | Preferred for body text |
| #1D4577 text on black | 2.16:1 | Fails | Lc -10.3 | 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 900.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A2C3EF
oklch(80.8% 0.072 255.7)
-
Step 400
400
#6EA3E8
oklch(70.7% 0.116 255.5)
-
Step 500
500
#468AE0
oklch(63% 0.147 255.5)
-
Step 600
600
#2472CE
oklch(55.5% 0.16 255.4)
-
Step 700
700
#165FB3
oklch(49.1% 0.15 255.6)
-
Step 800
800
#164E91
oklch(42.7% 0.124 255.6)
-
Step 900
900 (this color)
#1D4577
oklch(38.9% 0.096 255.4)
-
Step 950
950
#102744
oklch(27.1% 0.062 255.3)
#1D4577 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) | #2D4979 | 0.022 |
| Deuteranopia (no green cones) | #1F4176 | 0.012 |
| Tritanopia (no blue cones) | #005158 | 0.075 |
| Achromatopsia (no color) | #444444 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D4577
#1D4577
oklch(38.9% 0.096 255.4)
- #5E3D00
#5E3D00
oklch(38.9% 0.082 74.7)
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 #1D4577, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.015
- Light Navy #155084 ΔE 0.036
- Cobalt #1E488F ΔE 0.040
- Deep Sea Blue #015482 ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.050
- Marine Blue #01386A ΔE 0.050
- Dusk Blue #26538D ΔE 0.053
- Charcoal #264653 ΔE 0.063
Use #1D4577 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.