#155E55
Closest named color: Dark Green Blue (#1F6357). oklch(43.6% 0.07 182.9), rgb(21, 94, 85).
Aa
White text reads best on this color (7.59:1).
About this color
#155E55 is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 44%, its chroma 0.070 and its hue 183°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.018 away. White text reads best on it, at 7.59:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.76:1 |
| White text | 7.59:1 |
Values
| HEX | #155E55 |
| RGB | rgb(21, 94, 85) |
| HSL | hsl(173, 63%, 23%) |
| OKLCH | oklch(43.6% 0.07 182.9) |
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 #155E55 | 7.59:1 | AAA | Lc -90.9 | Preferred for body text |
| Black text on #155E55 | 2.76:1 | Fails | Lc 17.9 | Dividers and decoration only |
| #155E55 text on white | 7.59:1 | AAA | Lc 86.1 | Fine for body text |
| #155E55 text on black | 2.76:1 | Fails | Lc -16.0 | 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
#CADEDA
oklch(88.5% 0.022 182.5)
-
Step 300
300
#A4CAC3
oklch(80.9% 0.042 182.8)
-
Step 400
400
#71AEA4
oklch(70.6% 0.065 183)
-
Step 500
500
#469A8E
oklch(63.1% 0.084 182.9)
-
Step 600
600
#1E8478
oklch(55.5% 0.091 183.1)
-
Step 700
700
#0B7065
oklch(49.1% 0.085 182.9)
-
Step 800
800 (this color)
#155E55
oklch(43.6% 0.07 182.9)
-
Step 900
900
#184B44
oklch(37.7% 0.055 182.7)
-
Step 950
950
#102C28
oklch(27% 0.035 183.1)
#155E55 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) | #595855 | 0.075 |
| Deuteranopia (no green cones) | #4F5156 | 0.070 |
| Tritanopia (no blue cones) | #00605B | 0.011 |
| Achromatopsia (no color) | #545454 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155E55
#155E55
oklch(43.6% 0.07 182.9)
- #72404E
#72404E
oklch(43.6% 0.072 2.5)
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 #155E55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.018
- Petrol #005F6A ΔE 0.034
- Deep Teal #00555A ΔE 0.036
- Dark Aqua #05696B ΔE 0.042
- Dark Blue Green #005249 ΔE 0.043
- Dark Slate Gray #2F4F4F ΔE 0.048
- Spruce #0A5F38 ΔE 0.048
- Pine #2B5D34 ΔE 0.050
Use #155E55 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.