#155B50
Closest named color: Dark Green Blue (#1F6357). oklch(42.6% 0.069 179.9), rgb(21, 91, 80).
Aa
White text reads best on this color (7.94:1).
About this color
#155B50 is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.069 and its hue 180°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.028 away. White text reads best on it, at 7.94:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.64:1 |
| White text | 7.94:1 |
Values
| HEX | #155B50 |
| RGB | rgb(21, 91, 80) |
| HSL | hsl(171, 63%, 22%) |
| OKLCH | oklch(42.6% 0.069 179.9) |
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 #155B50 | 7.94:1 | AAA | Lc -92.0 | Preferred for body text |
| Black text on #155B50 | 2.64:1 | Fails | Lc 16.8 | Dividers and decoration only |
| #155B50 text on white | 7.94:1 | AAA | Lc 87.2 | Fine for body text |
| #155B50 text on black | 2.64:1 | Fails | Lc -14.9 | 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
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E2EDEA
oklch(93.7% 0.012 178)
-
Step 200
200
#CADED9
oklch(88.4% 0.022 179.1)
-
Step 300
300
#A5CAC1
oklch(81% 0.041 178.8)
-
Step 400
400
#72AEA2
oklch(70.6% 0.065 180.3)
-
Step 500
500
#499A8B
oklch(63.1% 0.083 179.7)
-
Step 600
600
#248475
oklch(55.5% 0.09 180.1)
-
Step 700
700
#137062
oklch(49.1% 0.084 179.5)
-
Step 800
800 (this color)
#155B50
oklch(42.6% 0.069 179.9)
-
Step 900
900
#1B4B43
oklch(37.7% 0.054 180.6)
-
Step 950
950
#112C27
oklch(27% 0.035 179.9)
#155B50 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) | #575550 | 0.074 |
| Deuteranopia (no green cones) | #4D4E51 | 0.070 |
| Tritanopia (no blue cones) | #005D58 | 0.013 |
| Achromatopsia (no color) | #515151 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155B50
#155B50
oklch(42.6% 0.069 179.9)
- #6E3E4D
#6E3E4D
oklch(42.7% 0.07 0.4)
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 #155B50, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.028
- Deep Teal #00555A ΔE 0.031
- Dark Blue Green #005249 ΔE 0.033
- Petrol #005F6A ΔE 0.041
- Dark Slate Gray #2F4F4F ΔE 0.042
- Spruce #0A5F38 ΔE 0.045
- Pine #2B5D34 ΔE 0.046
- Dark Teal #014D4E ΔE 0.049
Use #155B50 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.