#1B3147
Closest named color: Gunmetal (#293241). oklch(30.6% 0.049 249.7), rgb(27, 49, 71).
Aa
White text reads best on this color (13.31:1).
About this color
#1B3147 is a dark, muted blue. In OKLCH its lightness is 31%, its chroma 0.049 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Gunmetal (#293241), ΔE 0.023 away. White text reads best on it, at 13.31:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.57:1 |
| White text | 13.31:1 |
Values
| HEX | #1B3147 |
| RGB | rgb(27, 49, 71) |
| HSL | hsl(210, 45%, 19%) |
| OKLCH | oklch(30.6% 0.049 249.7) |
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 #1B3147 | 13.31:1 | AAA | Lc -102.8 | Preferred for body text |
| Black text on #1B3147 | 1.57:1 | Fails | Lc 0.0 | Not readable |
| #1B3147 text on white | 13.31:1 | AAA | Lc 99.6 | Preferred for body text |
| #1B3147 text on black | 1.57:1 | 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 950.
-
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
#CADBEE
oklch(88.5% 0.032 251.1)
-
Step 300
300
#A5C4E5
oklch(80.9% 0.058 250.2)
-
Step 400
400
#73A5D8
oklch(70.7% 0.092 249.7)
-
Step 500
500
#4C8ECE
oklch(63.1% 0.118 249.6)
-
Step 600
600
#2C77BB
oklch(55.7% 0.128 249.5)
-
Step 700
700
#1E63A1
oklch(49% 0.12 250)
-
Step 800
800
#1C5183
oklch(42.6% 0.1 250.4)
-
Step 900
900
#1D4469
oklch(37.8% 0.077 249.6)
-
Step 950
950 (this color)
#1B3147
oklch(30.6% 0.049 249.7)
#1B3147 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) | #283248 | 0.019 |
| Deuteranopia (no green cones) | #222D47 | 0.015 |
| Tritanopia (no blue cones) | #003639 | 0.042 |
| Achromatopsia (no color) | #2F2F2F | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3147
#1B3147
oklch(30.6% 0.049 249.7)
- #3F2B11
#3F2B11
oklch(30.7% 0.049 71.3)
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 #1B3147, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.023
- Space Cadet #2B2D42 ΔE 0.025
- Prussian Blue #1D3557 ΔE 0.030
- Midnight Green #073B4C ΔE 0.034
- Dark Blue Grey #1F3B4D ΔE 0.034
- Oxford Blue #1B263B ΔE 0.039
- Marine #042E60 ΔE 0.051
- Dark #1B2431 ΔE 0.053
Use #1B3147 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.