#155D4F
Closest named color: Dark Green Blue (#1F6357). oklch(43.1% 0.072 176.5), rgb(21, 93, 79).
Aa
White text reads best on this color (7.74:1).
About this color
#155D4F is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 43%, its chroma 0.072 and its hue 177°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.023 away. White text reads best on it, at 7.74:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.71:1 |
| White text | 7.74:1 |
Values
| HEX | #155D4F |
| RGB | rgb(21, 93, 79) |
| HSL | hsl(168, 63%, 22%) |
| OKLCH | oklch(43.1% 0.072 176.5) |
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 #155D4F | 7.74:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #155D4F | 2.71:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #155D4F text on white | 7.74:1 | AAA | Lc 86.6 | Fine for body text |
| #155D4F text on black | 2.71:1 | Fails | Lc -15.5 | 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
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E2EDE9
oklch(93.7% 0.013 172.4)
-
Step 200
200
#CADED9
oklch(88.4% 0.022 179.1)
-
Step 300
300
#A5CAC0
oklch(80.9% 0.042 177)
-
Step 400
400
#71AF9F
oklch(70.7% 0.069 176.1)
-
Step 500
500
#479B88
oklch(63.2% 0.087 176.4)
-
Step 600
600
#218572
oklch(55.6% 0.094 176.8)
-
Step 700
700
#0F715F
oklch(49.2% 0.088 176)
-
Step 800
800 (this color)
#155D4F
oklch(43.1% 0.072 176.5)
-
Step 900
900
#1A4B41
oklch(37.6% 0.055 177.4)
-
Step 950
950
#112C26
oklch(27% 0.035 177.1)
#155D4F 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) | #59574E | 0.075 |
| Deuteranopia (no green cones) | #4F5050 | 0.071 |
| Tritanopia (no blue cones) | #005E59 | 0.016 |
| Achromatopsia (no color) | #535353 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155D4F
#155D4F
oklch(43.1% 0.072 176.5)
- #703F51
#703F51
oklch(43.3% 0.072 357.1)
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 #155D4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.023
- Deep Teal #00555A ΔE 0.038
- Dark Blue Green #005249 ΔE 0.039
- Spruce #0A5F38 ΔE 0.040
- Pine #2B5D34 ΔE 0.041
- Petrol #005F6A ΔE 0.043
- Dark Slate Gray #2F4F4F ΔE 0.048
- Dark Aqua #05696B ΔE 0.050
Use #155D4F 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.