#155D71
Closest named color: Petrol (#005F6A). oklch(44.5% 0.074 221.3), rgb(21, 93, 113).
Aa
White text reads best on this color (7.40:1).
About this color
#155D71 is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 45%, its chroma 0.074 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.017 away. White text reads best on it, at 7.40:1.
| Hue family | Teals and cyans |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.83:1 |
| White text | 7.40:1 |
Values
| HEX | #155D71 |
| RGB | rgb(21, 93, 113) |
| HSL | hsl(193, 69%, 26%) |
| OKLCH | oklch(44.5% 0.074 221.3) |
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 #155D71 | 7.40:1 | AAA | Lc -90.3 | Preferred for body text |
| Black text on #155D71 | 2.83:1 | Fails | Lc 18.6 | Dividers and decoration only |
| #155D71 text on white | 7.40:1 | AAA | Lc 85.4 | Fine for body text |
| #155D71 text on black | 2.83:1 | Fails | Lc -16.6 | 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
#E1ECF0
oklch(93.6% 0.013 221.4)
-
Step 200
200
#C9DDE4
oklch(88.5% 0.023 220.8)
-
Step 300
300
#A3C8D5
oklch(81% 0.043 221.2)
-
Step 400
400
#6EABBF
oklch(70.7% 0.069 220.7)
-
Step 500
500
#4296AF
oklch(63.2% 0.089 220.4)
-
Step 600
600
#17809B
oklch(55.7% 0.096 220.7)
-
Step 700
700
#026C85
oklch(49.2% 0.09 221.3)
-
Step 800
800 (this color)
#155D71
oklch(44.5% 0.074 221.3)
-
Step 900
900
#164857
oklch(37.6% 0.058 221.6)
-
Step 950
950
#0F2A33
oklch(26.8% 0.037 222.6)
#155D71 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) | #515A72 | 0.060 |
| Deuteranopia (no green cones) | #455271 | 0.053 |
| Tritanopia (no blue cones) | #006363 | 0.036 |
| Achromatopsia (no color) | #555555 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155D71
#155D71
oklch(44.5% 0.074 221.3)
- #774533
#774533
oklch(44.6% 0.075 40.5)
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 #155D71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.017
- YInMn Blue #415A77 ΔE 0.042
- Dark Aqua #05696B ΔE 0.043
- Deep Teal #00555A ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.047
- Dark Green Blue #1F6357 ΔE 0.053
- Light Navy #155084 ΔE 0.058
Use #155D71 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.