#155F64
Closest named color: Petrol (#005F6A). oklch(44.5% 0.069 201.8), rgb(21, 95, 100).
Aa
White text reads best on this color (7.36:1).
About this color
#155F64 is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.069 and its hue 202°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.011 away. White text reads best on it, at 7.36:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.85:1 |
| White text | 7.36:1 |
Values
| HEX | #155F64 |
| RGB | rgb(21, 95, 100) |
| HSL | hsl(184, 65%, 24%) |
| OKLCH | oklch(44.5% 0.069 201.8) |
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 #155F64 | 7.36:1 | AAA | Lc -90.1 | Preferred for body text |
| Black text on #155F64 | 2.85:1 | Fails | Lc 18.8 | Dividers and decoration only |
| #155F64 text on white | 7.36:1 | AAA | Lc 85.3 | Fine for body text |
| #155F64 text on black | 2.85:1 | Fails | Lc -16.8 | 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
#F1F7F7
oklch(97.2% 0.006 197.1)
-
Step 100
100
#E1ECED
oklch(93.5% 0.012 203.5)
-
Step 200
200
#C9DEDF
oklch(88.5% 0.022 200.2)
-
Step 300
300
#A3C9CC
oklch(80.9% 0.041 202.3)
-
Step 400
400
#6FADB2
oklch(70.7% 0.064 202.3)
-
Step 500
500
#43989F
oklch(63.1% 0.082 202.7)
-
Step 600
600
#188389
oklch(55.7% 0.089 200.9)
-
Step 700
700
#026E75
oklch(49% 0.083 202.6)
-
Step 800
800 (this color)
#155F64
oklch(44.5% 0.069 201.8)
-
Step 900
900
#164A4E
oklch(37.7% 0.054 202.4)
-
Step 950
950
#0F2B2D
oklch(26.9% 0.034 201.6)
#155F64 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) | #575B64 | 0.069 |
| Deuteranopia (no green cones) | #4C5264 | 0.065 |
| Tritanopia (no blue cones) | #006360 | 0.017 |
| Achromatopsia (no color) | #565656 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155F64
#155F64
oklch(44.5% 0.069 201.8)
- #754443
#754443
oklch(44.5% 0.068 21.4)
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 #155F64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.011
- Dark Green Blue #1F6357 ΔE 0.029
- Dark Aqua #05696B ΔE 0.030
- Deep Teal #00555A ΔE 0.036
- Dark Slate Gray #2F4F4F ΔE 0.053
- Dark Blue Green #005249 ΔE 0.057
- YInMn Blue #415A77 ΔE 0.057
- Dark Aquamarine #017371 ΔE 0.061
Use #155F64 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.