#2B4259
Closest named color: Dark Grey Blue (#29465B). oklch(37.1% 0.049 249.3), rgb(43, 66, 89).
Aa
White text reads best on this color (10.36:1).
About this color
#2B4259 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.049 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.012 away. White text reads best on it, at 10.36:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.02:1 |
| White text | 10.36:1 |
Values
| HEX | #2B4259 |
| RGB | rgb(43, 66, 89) |
| HSL | hsl(210, 35%, 26%) |
| OKLCH | oklch(37.1% 0.049 249.3) |
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 #2B4259 | 10.36:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #2B4259 | 2.02:1 | Fails | Lc 9.9 | Not readable |
| #2B4259 text on white | 10.36:1 | AAA | Lc 94.0 | Preferred for body text |
| #2B4259 text on black | 2.02:1 | Fails | Lc -8.6 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EBF1
oklch(93.7% 0.01 247.9)
-
Step 200
200
#CFDBE6
oklch(88.6% 0.02 245.7)
-
Step 300
300
#AFC3D8
oklch(80.9% 0.037 249.6)
-
Step 400
400
#85A4C4
oklch(70.7% 0.058 249.5)
-
Step 500
500
#658DB6
oklch(63% 0.076 249.7)
-
Step 600
600
#4C77A1
oklch(55.6% 0.081 248.9)
-
Step 700
700
#3D648A
oklch(49.1% 0.076 249)
-
Step 800
800
#335270
oklch(42.8% 0.062 248.7)
-
Step 900
900 (this color)
#2B4259
oklch(37.1% 0.049 249.3)
-
Step 950
950
#1A2835
oklch(27% 0.031 247.2)
#2B4259 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) | #39435A | 0.020 |
| Deuteranopia (no green cones) | #333E59 | 0.016 |
| Tritanopia (no blue cones) | #16474A | 0.042 |
| Achromatopsia (no color) | #404040 | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4259
#2B4259
oklch(37.1% 0.049 249.3)
- #513B22
#513B22
oklch(37.1% 0.049 68.9)
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 #2B4259, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.012
- Charcoal #264653 ΔE 0.020
- Dark Blue Grey #1F3B4D ΔE 0.033
- Charcoal Grey #3C4142 ΔE 0.044
- Onyx #343A40 ΔE 0.044
- Prussian Blue #1D3557 ΔE 0.048
- Midnight Green #073B4C ΔE 0.048
- Dark Slate Gray #2F4F4F ΔE 0.052
Use #2B4259 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.