#2B3F57
Closest named color: Dark Grey Blue (#29465B). oklch(36.2% 0.049 253.5), rgb(43, 63, 87).
Aa
White text reads best on this color (10.76:1).
About this color
#2B3F57 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.049 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.022 away. White text reads best on it, at 10.76:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.95:1 |
| White text | 10.76:1 |
Values
| HEX | #2B3F57 |
| RGB | rgb(43, 63, 87) |
| HSL | hsl(213, 34%, 25%) |
| OKLCH | oklch(36.2% 0.049 253.5) |
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 #2B3F57 | 10.76:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #2B3F57 | 1.95:1 | Fails | Lc 9.0 | Not readable |
| #2B3F57 text on white | 10.76:1 | AAA | Lc 94.9 | Preferred for body text |
| #2B3F57 text on black | 1.95:1 | Fails | Lc -7.7 | 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
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D0DAE7
oklch(88.5% 0.021 254.9)
-
Step 300
300
#B1C2D8
oklch(80.8% 0.036 254.9)
-
Step 400
400
#87A3C5
oklch(70.6% 0.059 253.5)
-
Step 500
500
#698CB6
oklch(63% 0.075 253.4)
-
Step 600
600
#5076A2
oklch(55.6% 0.081 252.8)
-
Step 700
700
#41638B
oklch(49.2% 0.076 253.2)
-
Step 800
800
#365171
oklch(42.8% 0.063 253.3)
-
Step 900
900 (this color)
#2B3F57
oklch(36.2% 0.049 253.5)
-
Step 950
950
#1C2735
oklch(26.9% 0.03 254.7)
#2B3F57 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) | #364058 | 0.016 |
| Deuteranopia (no green cones) | #303C57 | 0.011 |
| Tritanopia (no blue cones) | #194447 | 0.042 |
| Achromatopsia (no color) | #3E3E3E | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3F57
#2B3F57
oklch(36.2% 0.049 253.5)
- #4D3A1F
#4D3A1F
oklch(36.3% 0.049 74.9)
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 #2B3F57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.022
- Charcoal #264653 ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.027
- Prussian Blue #1D3557 ΔE 0.039
- Onyx #343A40 ΔE 0.040
- Midnight Green #073B4C ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.045
- Gunmetal #293241 ΔE 0.051
Use #2B3F57 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.