#2A3F66
Closest named color: Dark Grey Blue (#29465B). oklch(37% 0.073 262), rgb(42, 63, 102).
Aa
White text reads best on this color (10.49:1).
About this color
#2A3F66 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.073 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.033 away. White text reads best on it, at 10.49:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.00:1 |
| White text | 10.49:1 |
Values
| HEX | #2A3F66 |
| RGB | rgb(42, 63, 102) |
| HSL | hsl(219, 42%, 28%) |
| OKLCH | oklch(37% 0.073 262) |
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 #2A3F66 | 10.49:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #2A3F66 | 2.00:1 | Fails | Lc 9.7 | Not readable |
| #2A3F66 text on white | 10.49:1 | AAA | Lc 94.2 | Preferred for body text |
| #2A3F66 text on black | 2.00:1 | Fails | Lc -8.3 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAEE
oklch(88.5% 0.03 260.7)
-
Step 300
300
#AEC1E5
oklch(80.9% 0.055 263.2)
-
Step 400
400
#83A1D7
oklch(70.7% 0.086 261.9)
-
Step 500
500
#6489CD
oklch(63.2% 0.111 261.9)
-
Step 600
600
#4B71BA
oklch(55.5% 0.122 262.3)
-
Step 700
700
#3C5FA0
oklch(49.2% 0.112 261.8)
-
Step 800
800
#324E82
oklch(42.8% 0.093 261.8)
-
Step 900
900 (this color)
#2A3F66
oklch(37% 0.073 262)
-
Step 950
950
#1A263D
oklch(27% 0.046 262.7)
#2A3F66 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) | #2F4268 | 0.012 |
| Deuteranopia (no green cones) | #283D65 | 0.007 |
| Tritanopia (no blue cones) | #05484D | 0.066 |
| Achromatopsia (no color) | #3F3F3F | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A3F66
#2A3F66
oklch(37% 0.073 262)
- #533B06
#533B06
oklch(37% 0.073 81.2)
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 #2A3F66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.033
- Twilight Blue #0A437A ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.043
- Marine Blue #01386A ΔE 0.044
- Charcoal #264653 ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.047
- Midnight Green #073B4C ΔE 0.059
- Light Navy #155084 ΔE 0.064
Use #2A3F66 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.