#2B555B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.2% 0.048 207.5), rgb(43, 85, 91).
Aa
White text reads best on this color (8.22:1).
About this color
#2B555B is a dark, muted teal or cyan. In OKLCH its lightness is 42%, its chroma 0.048 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.023 away. White text reads best on it, at 8.22:1.
| Hue family | Teals and cyans |
| Lightness | dark (42%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.55:1 |
| White text | 8.22:1 |
Values
| HEX | #2B555B |
| RGB | rgb(43, 85, 91) |
| HSL | hsl(188, 36%, 26%) |
| OKLCH | oklch(42.2% 0.048 207.5) |
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 #2B555B | 8.22:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #2B555B | 2.55:1 | Fails | Lc 15.7 | Dividers and decoration only |
| #2B555B text on white | 8.22:1 | AAA | Lc 88.3 | Fine for body text |
| #2B555B text on black | 2.55:1 | Fails | Lc -13.9 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBED
oklch(93.5% 0.008 216.6)
-
Step 200
200
#CEDCDE
oklch(88.4% 0.015 207.1)
-
Step 300
300
#ADC6CA
oklch(80.9% 0.028 208.3)
-
Step 400
400
#80A9AF
oklch(70.7% 0.045 207.3)
-
Step 500
500
#5F949B
oklch(63.2% 0.057 206.4)
-
Step 600
600
#447E86
oklch(55.7% 0.062 207.1)
-
Step 700
700
#356A72
oklch(49.1% 0.058 208.3)
-
Step 800
800 (this color)
#2B555B
oklch(42.2% 0.048 207.5)
-
Step 900
900
#29474C
oklch(37.7% 0.037 209.2)
-
Step 950
950
#182A2C
oklch(27% 0.024 204.7)
#2B555B 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) | #4F525B | 0.047 |
| Deuteranopia (no green cones) | #474C5B | 0.043 |
| Tritanopia (no blue cones) | #0F5857 | 0.024 |
| Achromatopsia (no color) | #4F4F4F | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B555B
#2B555B
oklch(42.2% 0.048 207.5)
- #65443F
#65443F
oklch(42.2% 0.047 28.8)
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 #2B555B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.023
- Deep Teal #00555A ΔE 0.026
- Petrol #005F6A ΔE 0.036
- Dark Blue Green #005249 ΔE 0.044
- Dark Teal #014D4E ΔE 0.045
- Dark Green Blue #1F6357 ΔE 0.048
- Charcoal #264653 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.050
Use #2B555B 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.