#1D375C
Closest named color: Prussian Blue (#1D3557). oklch(33.6% 0.073 257.4), rgb(29, 55, 92).
Aa
White text reads best on this color (11.97:1).
About this color
#1D375C is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.073 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.010 away. White text reads best on it, at 11.97:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.75:1 |
| White text | 11.97:1 |
Values
| HEX | #1D375C |
| RGB | rgb(29, 55, 92) |
| HSL | hsl(215, 52%, 24%) |
| OKLCH | oklch(33.6% 0.073 257.4) |
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 #1D375C | 11.97:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #1D375C | 1.75:1 | Fails | Lc 0.0 | Not readable |
| #1D375C text on white | 11.97:1 | AAA | Lc 97.2 | Preferred for body text |
| #1D375C text on black | 1.75:1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CDDAEE
oklch(88.5% 0.031 258.9)
-
Step 300
300
#ABC2E4
oklch(80.8% 0.054 258)
-
Step 400
400
#7EA2D7
oklch(70.6% 0.088 257.9)
-
Step 500
500
#5D8BCD
oklch(63.2% 0.112 257.4)
-
Step 600
600
#4273B9
oklch(55.5% 0.122 257.5)
-
Step 700
700
#3461A0
oklch(49.2% 0.113 257.2)
-
Step 800
800
#2C4F81
oklch(42.7% 0.093 257.5)
-
Step 900
900 (this color)
#1D375C
oklch(33.6% 0.073 257.4)
-
Step 950
950
#17273D
oklch(27% 0.047 256.6)
#1D375C 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) | #273A5E | 0.017 |
| Deuteranopia (no green cones) | #1E345B | 0.009 |
| Tritanopia (no blue cones) | #003F45 | 0.059 |
| Achromatopsia (no color) | #373737 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D375C
#1D375C
oklch(33.6% 0.073 257.4)
- #4B3100
#4B3100
oklch(33.6% 0.07 76.6)
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 #1D375C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.010
- Marine Blue #01386A ΔE 0.030
- Dark Blue Grey #1F3B4D ΔE 0.033
- Midnight Green #073B4C ΔE 0.039
- Marine #042E60 ΔE 0.039
- Gunmetal #293241 ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.053
Use #1D375C 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.