#2A3F55
Closest named color: Dark Grey Blue (#29465B). oklch(36% 0.047 250.3), rgb(42, 63, 85).
Aa
White text reads best on this color (10.82:1).
About this color
#2A3F55 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.047 and its hue 250°. 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 10.82:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.94:1 |
| White text | 10.82:1 |
Values
| HEX | #2A3F55 |
| RGB | rgb(42, 63, 85) |
| HSL | hsl(211, 34%, 25%) |
| OKLCH | oklch(36% 0.047 250.3) |
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 #2A3F55 | 10.82:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #2A3F55 | 1.94:1 | Fails | Lc 8.9 | Not readable |
| #2A3F55 text on white | 10.82:1 | AAA | Lc 95.0 | Preferred for body text |
| #2A3F55 text on black | 1.94:1 | Fails | Lc -7.6 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D0DAE6
oklch(88.4% 0.02 252.9)
-
Step 300
300
#B0C3D7
oklch(80.9% 0.035 249.6)
-
Step 400
400
#87A4C3
oklch(70.8% 0.056 250.3)
-
Step 500
500
#688DB4
oklch(63.1% 0.072 250.3)
-
Step 600
600
#4F77A0
oklch(55.7% 0.078 250)
-
Step 700
700
#406488
oklch(49.2% 0.071 249.5)
-
Step 800
800
#35516F
oklch(42.6% 0.061 251)
-
Step 900
900 (this color)
#2A3F55
oklch(36% 0.047 250.3)
-
Step 950
950
#1B2835
oklch(27.1% 0.03 249)
#2A3F55 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) | #364056 | 0.018 |
| Deuteranopia (no green cones) | #313B55 | 0.015 |
| Tritanopia (no blue cones) | #184446 | 0.041 |
| Achromatopsia (no color) | #3D3D3D | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3F55
#2A3F55
oklch(36% 0.047 250.3)
- #4D3921
#4D3921
oklch(36.1% 0.047 70.5)
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 #2A3F55, 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
- Dark Blue Grey #1F3B4D ΔE 0.024
- Charcoal #264653 ΔE 0.024
- Onyx #343A40 ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.039
- Midnight Green #073B4C ΔE 0.040
- Charcoal Grey #3C4142 ΔE 0.043
- Gunmetal #293241 ΔE 0.048
Use #2A3F55 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.