#155D6D
Closest named color: Petrol (#005F6A). oklch(44.3% 0.072 216.6), rgb(21, 93, 109).
Aa
White text reads best on this color (7.45:1).
About this color
#155D6D is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 44%, its chroma 0.072 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.012 away. White text reads best on it, at 7.45:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.81:1 |
| White text | 7.45:1 |
Values
| HEX | #155D6D |
| RGB | rgb(21, 93, 109) |
| HSL | hsl(191, 68%, 25%) |
| OKLCH | oklch(44.3% 0.072 216.6) |
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 #155D6D | 7.45:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #155D6D | 2.81:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #155D6D text on white | 7.45:1 | AAA | Lc 85.6 | Fine for body text |
| #155D6D text on black | 2.81:1 | Fails | Lc -16.5 | 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
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECEF
oklch(93.6% 0.012 215.8)
-
Step 200
200
#C9DDE3
oklch(88.4% 0.023 217.7)
-
Step 300
300
#A3C8D2
oklch(80.9% 0.042 216)
-
Step 400
400
#6FABBC
oklch(70.6% 0.067 217.6)
-
Step 500
500
#4396AB
oklch(63% 0.086 217)
-
Step 600
600
#198096
oklch(55.5% 0.093 216.6)
-
Step 700
700
#046C80
oklch(49% 0.086 216.7)
-
Step 800
800 (this color)
#155D6D
oklch(44.3% 0.072 216.6)
-
Step 900
900
#174955
oklch(37.8% 0.056 216.7)
-
Step 950
950
#0F2B32
oklch(27.1% 0.036 216.6)
#155D6D 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) | #525A6E | 0.062 |
| Deuteranopia (no green cones) | #46516D | 0.056 |
| Tritanopia (no blue cones) | #006362 | 0.031 |
| Achromatopsia (no color) | #555555 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155D6D
#155D6D
oklch(44.3% 0.072 216.6)
- #764537
#764537
oklch(44.5% 0.072 36.7)
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 #155D6D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.012
- Deep Teal #00555A ΔE 0.039
- Dark Aqua #05696B ΔE 0.040
- YInMn Blue #415A77 ΔE 0.045
- Dark Green Blue #1F6357 ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.052
- Light Navy Blue #2E5A88 ΔE 0.053
- Dark Slate Gray #2F4F4F ΔE 0.056
Use #155D6D 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.