#2A5166
Closest named color: Dark Grey Blue (#29465B). oklch(41.6% 0.056 233.9), rgb(42, 81, 102).
Aa
White text reads best on this color (8.51:1).
About this color
#2A5166 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.056 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.036 away. White text reads best on it, at 8.51:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.46:1 |
| White text | 8.51:1 |
Values
| HEX | #2A5166 |
| RGB | rgb(42, 81, 102) |
| HSL | hsl(201, 42%, 28%) |
| OKLCH | oklch(41.6% 0.056 233.9) |
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 #2A5166 | 8.51:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #2A5166 | 2.46:1 | Fails | Lc 14.8 | Not readable |
| #2A5166 text on white | 8.51:1 | AAA | Lc 89.2 | Fine for body text |
| #2A5166 text on black | 2.46:1 | Fails | Lc -13.1 | 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 800.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBEF
oklch(93.6% 0.009 232.4)
-
Step 200
200
#CEDBE4
oklch(88.4% 0.019 237.8)
-
Step 300
300
#ADC5D3
oklch(81% 0.033 233.4)
-
Step 400
400
#80A7BD
oklch(70.8% 0.053 233.2)
-
Step 500
500
#5F91AC
oklch(63.2% 0.067 232.9)
-
Step 600
600
#447B98
oklch(55.7% 0.074 233.2)
-
Step 700
700
#366782
oklch(49.1% 0.069 234.6)
-
Step 800
800 (this color)
#2A5166
oklch(41.6% 0.056 233.9)
-
Step 900
900
#294655
oklch(37.8% 0.043 232.1)
-
Step 950
950
#182932
oklch(27% 0.028 232.3)
#2A5166 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) | #475067 | 0.037 |
| Deuteranopia (no green cones) | #3F4A66 | 0.032 |
| Tritanopia (no blue cones) | #005758 | 0.043 |
| Achromatopsia (no color) | #4D4D4D | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A5166
#2A5166
oklch(41.6% 0.056 233.9)
- #64432E
#64432E
oklch(41.5% 0.056 53)
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 #2A5166, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.036
- Dark Slate Gray #2F4F4F ΔE 0.038
- Deep Teal #00555A ΔE 0.038
- Charcoal #264653 ΔE 0.043
- Petrol #005F6A ΔE 0.045
- YInMn Blue #415A77 ΔE 0.048
- Deep Sea Blue #015482 ΔE 0.049
- Dark Teal #014D4E ΔE 0.053
Use #2A5166 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.