#1D3557
Named color: Prussian Blue. oklch(32.8% 0.068 257.3), rgb(29, 53, 87).
Aa
White text reads best on this color (12.35:1).
About this color
#1D3557 is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.068 and its hue 257°. Its hue sits on the cool side of the wheel. It is the named color Prussian Blue. White text reads best on it, at 12.35:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Prussian Blue |
| Black text | 1.69:1 |
| White text | 12.35:1 |
Values
| HEX | #1D3557 |
| RGB | rgb(29, 53, 87) |
| HSL | hsl(215, 50%, 23%) |
| OKLCH | oklch(32.8% 0.068 257.3) |
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 #1D3557 | 12.35:1 | AAA | Lc -101.5 | Preferred for body text |
| Black text on #1D3557 | 1.69:1 | Fails | Lc 0.0 | Not readable |
| #1D3557 text on white | 12.35:1 | AAA | Lc 98.0 | Preferred for body text |
| #1D3557 text on black | 1.69:1 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAEC
oklch(88.5% 0.028 258.4)
-
Step 300
300
#ACC2E2
oklch(80.8% 0.051 257.7)
-
Step 400
400
#80A3D3
oklch(70.8% 0.081 256.4)
-
Step 500
500
#608BC8
oklch(63.1% 0.104 257.2)
-
Step 600
600
#4674B4
oklch(55.6% 0.112 256.9)
-
Step 700
700
#38619B
oklch(49.1% 0.104 257.3)
-
Step 800
800
#2E4F7E
oklch(42.6% 0.088 257.4)
-
Step 900
900 (this color)
#1D3557
oklch(32.8% 0.068 257.3)
-
Step 950
950
#19273B
oklch(27% 0.042 257.3)
#1D3557 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) | #263758 | 0.014 |
| Deuteranopia (no green cones) | #1F3256 | 0.009 |
| Tritanopia (no blue cones) | #003D41 | 0.058 |
| Achromatopsia (no color) | #343434 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D3557
#1D3557
oklch(32.8% 0.068 257.3)
- #482F01
#482F01
oklch(32.7% 0.068 76.4)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes and gradients that use #1D3557
These curated palettes and gradients contain exactly #1D3557. Open one to see the full color scheme around it.
Palettes
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.030
- Midnight Green #073B4C ΔE 0.035
- Marine Blue #01386A ΔE 0.036
- Marine #042E60 ΔE 0.038
- Gunmetal #293241 ΔE 0.040
- Space Cadet #2B2D42 ΔE 0.042
- Onyx #343A40 ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.058
Use #1D3557 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.