#1D3D63
Closest named color: Prussian Blue (#1D3557). oklch(35.6% 0.076 254.1), rgb(29, 61, 99).
Aa
White text reads best on this color (11.05:1).
About this color
#1D3D63 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.076 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.030 away. White text reads best on it, at 11.05:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.89:1 |
| White text | 11.05:1 |
Values
| HEX | #1D3D63 |
| RGB | rgb(29, 61, 99) |
| HSL | hsl(213, 55%, 25%) |
| OKLCH | oklch(35.6% 0.076 254.1) |
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 #1D3D63 | 11.05:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #1D3D63 | 1.89:1 | Fails | Lc 8.5 | Not readable |
| #1D3D63 text on white | 11.05:1 | AAA | Lc 95.4 | Preferred for body text |
| #1D3D63 text on black | 1.89:1 | Fails | Lc 0.0 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CBDBEE
oklch(88.5% 0.031 252.7)
-
Step 300
300
#A8C3E6
oklch(80.9% 0.058 255)
-
Step 400
400
#78A4D9
oklch(70.8% 0.092 253.6)
-
Step 500
500
#558CCF
oklch(63.2% 0.117 254.3)
-
Step 600
600
#3875BC
oklch(55.7% 0.128 253.9)
-
Step 700
700
#2A62A2
oklch(49.2% 0.118 253.8)
-
Step 800
800
#245083
oklch(42.7% 0.098 253.9)
-
Step 900
900 (this color)
#1D3D63
oklch(35.6% 0.076 254.1)
-
Step 950
950
#15273E
oklch(27% 0.049 255.2)
#1D3D63 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) | #2C3F65 | 0.020 |
| Deuteranopia (no green cones) | #223962 | 0.013 |
| Tritanopia (no blue cones) | #00464B | 0.061 |
| Achromatopsia (no color) | #3C3C3C | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3D63
#1D3D63
oklch(35.6% 0.076 254.1)
- #533500
#533500
oklch(35.6% 0.075 74.2)
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 #1D3D63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.030
- Marine Blue #01386A ΔE 0.030
- Dark Blue Grey #1F3B4D ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.039
- Twilight Blue #0A437A ΔE 0.041
- Midnight Green #073B4C ΔE 0.046
- Charcoal #264653 ΔE 0.047
- Marine #042E60 ΔE 0.054
Use #1D3D63 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.