#1D375F
Closest named color: Prussian Blue (#1D3557). oklch(33.8% 0.078 258.8), rgb(29, 55, 95).
Aa
White text reads best on this color (11.90:1).
About this color
#1D375F is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.078 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.015 away. White text reads best on it, at 11.90:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.76:1 |
| White text | 11.90:1 |
Values
| HEX | #1D375F |
| RGB | rgb(29, 55, 95) |
| HSL | hsl(216, 53%, 24%) |
| OKLCH | oklch(33.8% 0.078 258.8) |
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 #1D375F | 11.90:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #1D375F | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #1D375F text on white | 11.90:1 | AAA | Lc 97.1 | Preferred for body text |
| #1D375F text on black | 1.76:1 | 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
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CCDAEF
oklch(88.4% 0.033 258.4)
-
Step 300
300
#AAC2E7
oklch(80.9% 0.059 259)
-
Step 400
400
#7DA2DB
oklch(70.7% 0.093 258.8)
-
Step 500
500
#5C8AD1
oklch(63.2% 0.119 258.8)
-
Step 600
600
#4172BE
oklch(55.5% 0.13 258.9)
-
Step 700
700
#3360A4
oklch(49.2% 0.12 258.5)
-
Step 800
800
#2B4E85
oklch(42.6% 0.1 259.1)
-
Step 900
900 (this color)
#1D375F
oklch(33.8% 0.078 258.8)
-
Step 950
950
#17273E
oklch(27.1% 0.048 257.5)
#1D375F 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) | #253A61 | 0.015 |
| Deuteranopia (no green cones) | #1C345E | 0.010 |
| Tritanopia (no blue cones) | #004046 | 0.064 |
| Achromatopsia (no color) | #373737 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D375F
#1D375F
oklch(33.8% 0.078 258.8)
- #4B3200
#4B3200
oklch(33.8% 0.07 78.2)
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 #1D375F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.015
- Marine Blue #01386A ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.038
- Marine #042E60 ΔE 0.038
- Midnight Green #073B4C ΔE 0.044
- Gunmetal #293241 ΔE 0.053
- Twilight Blue #0A437A ΔE 0.054
- Dark Grey Blue #29465B ΔE 0.054
Use #1D375F 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.