#155D55
Closest named color: Dark Green Blue (#1F6357). oklch(43.4% 0.069 184), rgb(21, 93, 85).
Aa
White text reads best on this color (7.69:1).
About this color
#155D55 is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.069 and its hue 184°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.021 away. White text reads best on it, at 7.69:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.72:1 |
| White text | 7.69:1 |
Values
| HEX | #155D55 |
| RGB | rgb(21, 93, 85) |
| HSL | hsl(173, 63%, 22%) |
| OKLCH | oklch(43.4% 0.069 184) |
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 #155D55 | 7.69:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #155D55 | 2.72:1 | Fails | Lc 17.6 | Dividers and decoration only |
| #155D55 text on white | 7.69:1 | AAA | Lc 86.4 | Fine for body text |
| #155D55 text on black | 2.72:1 | Fails | Lc -15.7 | 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
#E2EDEB
oklch(93.7% 0.012 184.1)
-
Step 200
200
#CADEDB
oklch(88.5% 0.022 186)
-
Step 300
300
#A4CAC3
oklch(80.9% 0.042 182.8)
-
Step 400
400
#71AEA5
oklch(70.7% 0.065 184.2)
-
Step 500
500
#479A8F
oklch(63.1% 0.083 183.9)
-
Step 600
600
#1F8479
oklch(55.5% 0.09 184.1)
-
Step 700
700
#0D7066
oklch(49.1% 0.084 183.9)
-
Step 800
800 (this color)
#155D55
oklch(43.4% 0.069 184)
-
Step 900
900
#194B45
oklch(37.7% 0.054 184.3)
-
Step 950
950
#102C28
oklch(27% 0.035 183.1)
#155D55 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) | #585755 | 0.074 |
| Deuteranopia (no green cones) | #4E5056 | 0.070 |
| Tritanopia (no blue cones) | #005F5A | 0.010 |
| Achromatopsia (no color) | #535353 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155D55
#155D55
oklch(43.4% 0.069 184)
- #71404C
#71404C
oklch(43.4% 0.07 4.6)
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 #155D55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.021
- Deep Teal #00555A ΔE 0.032
- Petrol #005F6A ΔE 0.033
- Dark Blue Green #005249 ΔE 0.040
- Dark Aqua #05696B ΔE 0.044
- Dark Slate Gray #2F4F4F ΔE 0.045
- Spruce #0A5F38 ΔE 0.050
- Pine #2B5D34 ΔE 0.051
Use #155D55 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.