#2A5566
Closest named color: Petrol (#005F6A). oklch(42.6% 0.055 226.1), rgb(42, 85, 102).
Aa
White text reads best on this color (8.10:1).
About this color
#2A5566 is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.055 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.034 away. White text reads best on it, at 8.10:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.58:1 |
| White text | 8.10:1 |
Values
| HEX | #2A5566 |
| RGB | rgb(42, 85, 102) |
| HSL | hsl(197, 42%, 28%) |
| OKLCH | oklch(42.6% 0.055 226.1) |
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 #2A5566 | 8.10:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #2A5566 | 2.58:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #2A5566 text on white | 8.10:1 | AAA | Lc 87.9 | Fine for body text |
| #2A5566 text on black | 2.58:1 | Fails | Lc -14.2 | 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
#CDDCE2
oklch(88.5% 0.018 223.6)
-
Step 300
300
#ACC5D1
oklch(80.9% 0.032 228.3)
-
Step 400
400
#7EA8BA
oklch(70.7% 0.052 226.2)
-
Step 500
500
#5C92A8
oklch(63.1% 0.066 225.8)
-
Step 600
600
#407C94
oklch(55.6% 0.072 226.4)
-
Step 700
700
#32687E
oklch(49% 0.067 227.2)
-
Step 800
800 (this color)
#2A5566
oklch(42.6% 0.055 226.1)
-
Step 900
900
#274653
oklch(37.6% 0.043 226.9)
-
Step 950
950
#172931
oklch(26.9% 0.028 227.9)
#2A5566 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) | #4C5367 | 0.043 |
| Deuteranopia (no green cones) | #434D66 | 0.037 |
| Tritanopia (no blue cones) | #005A5A | 0.038 |
| Achromatopsia (no color) | #505050 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A5566
#2A5566
oklch(42.6% 0.055 226.1)
- #684535
#684535
oklch(42.6% 0.055 45.4)
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 #2A5566, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.034
- Deep Teal #00555A ΔE 0.034
- Dark Slate Gray #2F4F4F ΔE 0.038
- YInMn Blue #415A77 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.048
- Deep Sea Blue #015482 ΔE 0.052
- Charcoal #264653 ΔE 0.052
- Dark Teal #014D4E ΔE 0.055
Use #2A5566 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.