#155C5E
Closest named color: Petrol (#005F6A). oklch(43.4% 0.067 197.8), rgb(21, 92, 94).
Aa
White text reads best on this color (7.70:1).
About this color
#155C5E is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.067 and its hue 198°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.019 away. White text reads best on it, at 7.70:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.72:1 |
| White text | 7.70:1 |
Values
| HEX | #155C5E |
| RGB | rgb(21, 92, 94) |
| HSL | hsl(182, 63%, 23%) |
| OKLCH | oklch(43.4% 0.067 197.8) |
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 #155C5E | 7.70:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #155C5E | 2.72:1 | Fails | Lc 17.6 | Dividers and decoration only |
| #155C5E text on white | 7.70:1 | AAA | Lc 86.5 | Fine for body text |
| #155C5E text on black | 2.72:1 | Fails | Lc -15.6 | 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
#F2F7F7
oklch(97.2% 0.005 197.1)
-
Step 100
100
#E2ECEC
oklch(93.6% 0.011 197)
-
Step 200
200
#CADEDE
oklch(88.6% 0.021 196.8)
-
Step 300
300
#A4C9C9
oklch(80.9% 0.039 196.4)
-
Step 400
400
#71ADAE
oklch(70.7% 0.062 197.2)
-
Step 500
500
#46989B
oklch(63% 0.08 198.6)
-
Step 600
600
#1F8385
oklch(55.7% 0.087 197)
-
Step 700
700
#0D6E71
oklch(49% 0.08 198.3)
-
Step 800
800 (this color)
#155C5E
oklch(43.4% 0.067 197.8)
-
Step 900
900
#194A4B
oklch(37.7% 0.052 197.1)
-
Step 950
950
#102B2C
oklch(26.9% 0.033 198.6)
#155C5E 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) | #55575E | 0.069 |
| Deuteranopia (no green cones) | #4A505E | 0.062 |
| Tritanopia (no blue cones) | #005F5C | 0.013 |
| Achromatopsia (no color) | #535353 | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155C5E
#155C5E
oklch(43.4% 0.067 197.8)
- #714143
#714143
oklch(43.3% 0.067 17.5)
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 #155C5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.019
- Deep Teal #00555A ΔE 0.026
- Dark Green Blue #1F6357 ΔE 0.030
- Dark Aqua #05696B ΔE 0.041
- Dark Slate Gray #2F4F4F ΔE 0.043
- Dark Blue Green #005249 ΔE 0.045
- Dark Teal #014D4E ΔE 0.053
- YInMn Blue #415A77 ΔE 0.063
Use #155C5E 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.