#155F56
Closest named color: Dark Green Blue (#1F6357). oklch(44% 0.071 183), rgb(21, 95, 86).
Aa
White text reads best on this color (7.49:1).
About this color
#155F56 is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 44%, its chroma 0.071 and its hue 183°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.015 away. White text reads best on it, at 7.49:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.80:1 |
| White text | 7.49:1 |
Values
| HEX | #155F56 |
| RGB | rgb(21, 95, 86) |
| HSL | hsl(173, 64%, 23%) |
| OKLCH | oklch(44% 0.071 183) |
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 #155F56 | 7.49:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #155F56 | 2.80:1 | Fails | Lc 18.3 | Dividers and decoration only |
| #155F56 text on white | 7.49:1 | AAA | Lc 85.7 | Fine for body text |
| #155F56 text on black | 2.80:1 | Fails | Lc -16.3 | Dividers and decoration only |
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
#F2F7F6
oklch(97.2% 0.005 183)
-
Step 100
100
#E2EDEA
oklch(93.7% 0.012 178)
-
Step 200
200
#C9DEDA
oklch(88.4% 0.023 183.1)
-
Step 300
300
#A4CAC3
oklch(80.9% 0.042 182.8)
-
Step 400
400
#70AFA4
oklch(70.8% 0.067 182.1)
-
Step 500
500
#459A8E
oklch(63% 0.084 183)
-
Step 600
600
#1B8578
oklch(55.7% 0.093 182.4)
-
Step 700
700
#077065
oklch(49% 0.086 183)
-
Step 800
800 (this color)
#155F56
oklch(44% 0.071 183)
-
Step 900
900
#184B44
oklch(37.7% 0.055 182.7)
-
Step 950
950
#102C28
oklch(27% 0.035 183.1)
#155F56 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) | #5A5956 | 0.075 |
| Deuteranopia (no green cones) | #505257 | 0.071 |
| Tritanopia (no blue cones) | #00615C | 0.011 |
| Achromatopsia (no color) | #555555 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155F56
#155F56
oklch(44% 0.071 183)
- #73414F
#73414F
oklch(44% 0.071 2.4)
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 #155F56, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.015
- Petrol #005F6A ΔE 0.033
- Deep Teal #00555A ΔE 0.038
- Dark Aqua #05696B ΔE 0.039
- Dark Blue Green #005249 ΔE 0.046
- Spruce #0A5F38 ΔE 0.049
- Pine #2B5D34 ΔE 0.050
- Dark Slate Gray #2F4F4F ΔE 0.051
Use #155F56 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.