#155A6D
Closest named color: Petrol (#005F6A). oklch(43.5% 0.072 220.9), rgb(21, 90, 109).
Aa
White text reads best on this color (7.73:1).
About this color
#155A6D is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 44%, its chroma 0.072 and its hue 221°. 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 7.73:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.71:1 |
| White text | 7.73:1 |
Values
| HEX | #155A6D |
| RGB | rgb(21, 90, 109) |
| HSL | hsl(193, 68%, 25%) |
| OKLCH | oklch(43.5% 0.072 220.9) |
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 #155A6D | 7.73:1 | AAA | Lc -91.3 | Preferred for body text |
| Black text on #155A6D | 2.71:1 | Fails | Lc 17.5 | Dividers and decoration only |
| #155A6D text on white | 7.73:1 | AAA | Lc 86.5 | Fine for body text |
| #155A6D text on black | 2.71:1 | Fails | Lc -15.5 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#C9DDE4
oklch(88.5% 0.023 220.8)
-
Step 300
300
#A4C7D4
oklch(80.8% 0.042 222.4)
-
Step 400
400
#70ABBE
oklch(70.8% 0.067 220.2)
-
Step 500
500
#4595AE
oklch(63% 0.086 221.3)
-
Step 600
600
#1E7F9A
oklch(55.5% 0.094 221.6)
-
Step 700
700
#0C6B83
oklch(49% 0.087 221.2)
-
Step 800
800 (this color)
#155A6D
oklch(43.5% 0.072 220.9)
-
Step 900
900
#184856
oklch(37.6% 0.056 220.6)
-
Step 950
950
#102A33
oklch(26.9% 0.036 223.3)
#155A6D 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) | #4F576E | 0.060 |
| Deuteranopia (no green cones) | #434F6D | 0.052 |
| Tritanopia (no blue cones) | #006060 | 0.034 |
| Achromatopsia (no color) | #535353 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155A6D
#155A6D
oklch(43.5% 0.072 220.9)
- #734331
#734331
oklch(43.6% 0.073 41.2)
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 #155A6D, 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 0.035
- Deep Sea Blue #015482 ΔE 0.045
- YInMn Blue #415A77 ΔE 0.045
- Dark Aqua #05696B ΔE 0.049
- Light Navy Blue #2E5A88 ΔE 0.051
- Dark Slate Gray #2F4F4F ΔE 0.052
- Dark Green Blue #1F6357 ΔE 0.054
Use #155A6D 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.