#2A4E51
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.8% 0.042 202.5), rgb(42, 78, 81).
Aa
White text reads best on this color (9.10:1).
About this color
#2A4E51 is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.042 and its hue 203°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.008 away. White text reads best on it, at 9.10:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.30:1 |
| White text | 9.10:1 |
Values
| HEX | #2A4E51 |
| RGB | rgb(42, 78, 81) |
| HSL | hsl(185, 32%, 24%) |
| OKLCH | oklch(39.8% 0.042 202.5) |
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 #2A4E51 | 9.10:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #2A4E51 | 2.30:1 | Fails | Lc 13.1 | Not readable |
| #2A4E51 text on white | 9.10:1 | AAA | Lc 90.9 | Preferred for body text |
| #2A4E51 text on black | 2.30:1 | Fails | Lc -11.5 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECEC
oklch(93.6% 0.01 197)
-
Step 200
200
#CDDDDE
oklch(88.6% 0.017 201.4)
-
Step 300
300
#AAC7C9
oklch(80.9% 0.031 201.7)
-
Step 400
400
#7CAAAE
oklch(70.7% 0.049 202.8)
-
Step 500
500
#58959A
oklch(63% 0.064 202.4)
-
Step 600
600
#3A7F85
oklch(55.5% 0.07 203)
-
Step 700
700
#2C6C71
oklch(49.2% 0.065 202.3)
-
Step 800
800
#26585C
oklch(42.8% 0.054 202.4)
-
Step 900
900 (this color)
#2A4E51
oklch(39.8% 0.042 202.5)
-
Step 950
950
#162A2C
oklch(26.9% 0.026 203.9)
#2A4E51 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) | #494B51 | 0.042 |
| Deuteranopia (no green cones) | #434651 | 0.040 |
| Tritanopia (no blue cones) | #17504F | 0.018 |
| Achromatopsia (no color) | #484848 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2A4E51
#2A4E51
oklch(39.8% 0.042 202.5)
- #5C3E3D
#5C3E3D
oklch(39.8% 0.042 21.3)
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 #2A4E51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.008
- Charcoal #264653 ΔE 0.029
- Dark Teal #014D4E ΔE 0.029
- Deep Teal #00555A ΔE 0.030
- Dark Blue Green #005249 ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal Grey #3C4142 ΔE 0.044
- Petrol #005F6A ΔE 0.058
Use #2A4E51 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.