#155E6A
Closest named color: Petrol (#005F6A). oklch(44.5% 0.07 211.3), rgb(21, 94, 106).
Aa
White text reads best on this color (7.39:1).
About this color
#155E6A is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 44%, its chroma 0.070 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.007 away. White text reads best on it, at 7.39:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.84:1 |
| White text | 7.39:1 |
Values
| HEX | #155E6A |
| RGB | rgb(21, 94, 106) |
| HSL | hsl(188, 67%, 25%) |
| OKLCH | oklch(44.5% 0.07 211.3) |
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 #155E6A | 7.39:1 | AAA | Lc -90.2 | Preferred for body text |
| Black text on #155E6A | 2.84:1 | Fails | Lc 18.7 | Dividers and decoration only |
| #155E6A text on white | 7.39:1 | AAA | Lc 85.4 | Fine for body text |
| #155E6A text on black | 2.84:1 | Fails | Lc -16.7 | 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
#F1F6F7
oklch(97% 0.005 211)
-
Step 100
100
#E1ECEE
oklch(93.5% 0.012 209.8)
-
Step 200
200
#C9DEE2
oklch(88.6% 0.023 210.4)
-
Step 300
300
#A3C8D0
oklch(80.9% 0.041 212.3)
-
Step 400
400
#6FACB8
oklch(70.7% 0.065 211.4)
-
Step 500
500
#4397A6
oklch(63.1% 0.083 211)
-
Step 600
600
#188192
oklch(55.6% 0.091 211.8)
-
Step 700
700
#026D7C
oklch(49.1% 0.085 211.3)
-
Step 800
800 (this color)
#155E6A
oklch(44.5% 0.07 211.3)
-
Step 900
900
#164952
oklch(37.6% 0.055 211.5)
-
Step 950
950
#0F2B30
oklch(27% 0.035 210.9)
#155E6A 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) | #545A6B | 0.065 |
| Deuteranopia (no green cones) | #49526A | 0.059 |
| Tritanopia (no blue cones) | #006362 | 0.025 |
| Achromatopsia (no color) | #565656 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155E6A
#155E6A
oklch(44.5% 0.07 211.3)
- #76453B
#76453B
oklch(44.6% 0.07 32.3)
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 #155E6A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.007
- Dark Aqua #05696B ΔE 0.035
- Deep Teal #00555A ΔE 0.038
- Dark Green Blue #1F6357 ΔE 0.040
- YInMn Blue #415A77 ΔE 0.049
- Dark Slate Gray #2F4F4F ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.058
- Light Navy Blue #2E5A88 ΔE 0.059
Use #155E6A 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.