#155A66
Closest named color: Petrol (#005F6A). oklch(43.2% 0.068 212.1), rgb(21, 90, 102).
Aa
White text reads best on this color (7.81:1).
About this color
#155A66 is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.068 and its hue 212°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.016 away. White text reads best on it, at 7.81:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.68:1 |
| White text | 7.81:1 |
Values
| HEX | #155A66 |
| RGB | rgb(21, 90, 102) |
| HSL | hsl(189, 66%, 24%) |
| OKLCH | oklch(43.2% 0.068 212.1) |
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 #155A66 | 7.81:1 | AAA | Lc -91.6 | Preferred for body text |
| Black text on #155A66 | 2.68:1 | Fails | Lc 17.2 | Dividers and decoration only |
| #155A66 text on white | 7.81:1 | AAA | Lc 86.8 | Fine for body text |
| #155A66 text on black | 2.68:1 | Fails | Lc -15.3 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECEE
oklch(93.6% 0.011 211)
-
Step 200
200
#CADDE2
oklch(88.5% 0.022 215.3)
-
Step 300
300
#A4C8D0
oklch(80.9% 0.04 212.7)
-
Step 400
400
#71ACB8
oklch(70.8% 0.064 211.8)
-
Step 500
500
#4797A6
oklch(63.2% 0.081 211.5)
-
Step 600
600
#208191
oklch(55.7% 0.088 211.4)
-
Step 700
700
#0F6D7C
oklch(49.2% 0.082 211.9)
-
Step 800
800 (this color)
#155A66
oklch(43.2% 0.068 212.1)
-
Step 900
900
#194952
oklch(37.7% 0.053 212.1)
-
Step 950
950
#102B30
oklch(27% 0.034 211.3)
#155A66 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) | #515767 | 0.063 |
| Deuteranopia (no green cones) | #464E66 | 0.058 |
| Tritanopia (no blue cones) | #005F5E | 0.025 |
| Achromatopsia (no color) | #525252 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155A66
#155A66
oklch(43.2% 0.068 212.1)
- #714238
#714238
oklch(43.3% 0.068 32.8)
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 #155A66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.016
- Deep Teal #00555A ΔE 0.026
- Dark Slate Gray #2F4F4F ΔE 0.044
- Dark Green Blue #1F6357 ΔE 0.045
- Dark Aqua #05696B ΔE 0.046
- YInMn Blue #415A77 ΔE 0.052
- Dark Blue Green #005249 ΔE 0.052
- Dark Teal #014D4E ΔE 0.054
Use #155A66 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.