#155E5B
Closest named color: Dark Green Blue (#1F6357). oklch(43.9% 0.068 190.8), rgb(21, 94, 91).
Aa
White text reads best on this color (7.54:1).
About this color
#155E5B is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.068 and its hue 191°. 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 7.54:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.78:1 |
| White text | 7.54:1 |
Values
| HEX | #155E5B |
| RGB | rgb(21, 94, 91) |
| HSL | hsl(178, 63%, 23%) |
| OKLCH | oklch(43.9% 0.068 190.8) |
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 #155E5B | 7.54:1 | AAA | Lc -90.7 | Preferred for body text |
| Black text on #155E5B | 2.78:1 | Fails | Lc 18.1 | Dividers and decoration only |
| #155E5B text on white | 7.54:1 | AAA | Lc 85.9 | Fine for body text |
| #155E5B text on black | 2.78:1 | Fails | Lc -16.2 | 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
#E2ECEC
oklch(93.6% 0.011 197)
-
Step 200
200
#C9DEDC
oklch(88.4% 0.023 189.8)
-
Step 300
300
#A4C9C7
oklch(80.9% 0.039 192.3)
-
Step 400
400
#70AEAA
oklch(70.8% 0.064 190.6)
-
Step 500
500
#459995
oklch(63% 0.081 191.1)
-
Step 600
600
#1C8480
oklch(55.7% 0.089 190.9)
-
Step 700
700
#086F6C
oklch(49% 0.082 191.5)
-
Step 800
800 (this color)
#155E5B
oklch(43.9% 0.068 190.8)
-
Step 900
900
#184B48
oklch(37.8% 0.054 189.7)
-
Step 950
950
#102C2A
oklch(27.1% 0.034 189.1)
#155E5B 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) | #58595B | 0.072 |
| Deuteranopia (no green cones) | #4E515C | 0.069 |
| Tritanopia (no blue cones) | #00615D | 0.010 |
| Achromatopsia (no color) | #545454 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155E5B
#155E5B
oklch(43.9% 0.068 190.8)
- #734249
#734249
oklch(44% 0.068 11.1)
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 #155E5B, 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
- Petrol #005F6A ΔE 0.024
- Deep Teal #00555A ΔE 0.032
- Dark Aqua #05696B ΔE 0.037
- Dark Blue Green #005249 ΔE 0.046
- Dark Slate Gray #2F4F4F ΔE 0.047
- Dark Teal #014D4E ΔE 0.058
- Spruce #0A5F38 ΔE 0.058
Use #155E5B 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.