#2F4E51
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.1% 0.037 203.6), rgb(47, 78, 81).
Aa
White text reads best on this color (9.01:1).
About this color
#2F4E51 is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.037 and its hue 204°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.005 away. White text reads best on it, at 9.01:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.32:1 |
| White text | 9.01:1 |
Values
| HEX | #2F4E51 |
| RGB | rgb(47, 78, 81) |
| HSL | hsl(185, 27%, 25%) |
| OKLCH | oklch(40.1% 0.037 203.6) |
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 #2F4E51 | 9.01:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #2F4E51 | 2.32:1 | Fails | Lc 13.3 | Not readable |
| #2F4E51 text on white | 9.01:1 | AAA | Lc 90.6 | Preferred for body text |
| #2F4E51 text on black | 2.32:1 | Fails | Lc -11.7 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E4EBEC
oklch(93.5% 0.008 207.1)
-
Step 200
200
#CEDCDE
oklch(88.4% 0.015 207.1)
-
Step 300
300
#ADC6C9
oklch(80.9% 0.027 205.4)
-
Step 400
400
#80A9AD
oklch(70.6% 0.045 203.7)
-
Step 500
500
#5F9499
oklch(63.1% 0.057 203.4)
-
Step 600
600
#447E84
oklch(55.6% 0.061 204.2)
-
Step 700
700
#356A6F
oklch(49% 0.057 203.5)
-
Step 800
800
#2D575B
oklch(42.8% 0.047 203.6)
-
Step 900
900 (this color)
#2F4E51
oklch(40.1% 0.037 203.6)
-
Step 950
950
#182A2C
oklch(27% 0.024 204.7)
#2F4E51 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) | #4A4C51 | 0.038 |
| Deuteranopia (no green cones) | #444751 | 0.035 |
| Tritanopia (no blue cones) | #21504F | 0.016 |
| Achromatopsia (no color) | #494949 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F4E51
#2F4E51
oklch(40.1% 0.037 203.6)
- #5A403E
#5A403E
oklch(40% 0.037 23.8)
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 #2F4E51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.005
- Charcoal #264653 ΔE 0.031
- Deep Teal #00555A ΔE 0.034
- Dark Teal #014D4E ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.037
- Dark Blue Green #005249 ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.043
- Petrol #005F6A ΔE 0.059
Use #2F4E51 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.