#1B3A4E
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.4% 0.051 239.1), rgb(27, 58, 78).
Aa
White text reads best on this color (11.91:1).
About this color
#1B3A4E is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.051 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.006 away. White text reads best on it, at 11.91:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.76:1 |
| White text | 11.91:1 |
Values
| HEX | #1B3A4E |
| RGB | rgb(27, 58, 78) |
| HSL | hsl(204, 49%, 21%) |
| OKLCH | oklch(33.4% 0.051 239.1) |
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 #1B3A4E | 11.91:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #1B3A4E | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #1B3A4E text on white | 11.91:1 | AAA | Lc 97.2 | Preferred for body text |
| #1B3A4E 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CDDBE6
oklch(88.4% 0.021 241.4)
-
Step 300
300
#ABC5D7
oklch(81% 0.038 238.2)
-
Step 400
400
#7DA6C3
oklch(70.6% 0.062 239.5)
-
Step 500
500
#5B90B4
oklch(63.1% 0.078 239.4)
-
Step 600
600
#3F7AA0
oklch(55.6% 0.085 239.1)
-
Step 700
700
#316789
oklch(49.2% 0.079 238.8)
-
Step 800
800
#29546F
oklch(42.7% 0.066 238.5)
-
Step 900
900 (this color)
#1B3A4E
oklch(33.4% 0.051 239.1)
-
Step 950
950
#172935
oklch(27.1% 0.033 238.8)
#1B3A4E 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) | #313A4F | 0.029 |
| Deuteranopia (no green cones) | #2A354E | 0.023 |
| Tritanopia (no blue cones) | #003F41 | 0.038 |
| Achromatopsia (no color) | #373737 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3A4E
#1B3A4E
oklch(33.4% 0.051 239.1)
- #4A301A
#4A301A
oklch(33.5% 0.051 60)
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 #1B3A4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.006
- Midnight Green #073B4C ΔE 0.016
- Prussian Blue #1D3557 ΔE 0.026
- Gunmetal #293241 ΔE 0.032
- Onyx #343A40 ΔE 0.040
- Charcoal #264653 ΔE 0.043
- Space Cadet #2B2D42 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.047
Use #1B3A4E 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.