#155A71
Closest named color: Petrol (#005F6A). oklch(43.7% 0.075 225.4), rgb(21, 90, 113).
Aa
White text reads best on this color (7.68:1).
About this color
#155A71 is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 44%, its chroma 0.075 and its hue 225°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.023 away. White text reads best on it, at 7.68:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.73:1 |
| White text | 7.68:1 |
Values
| HEX | #155A71 |
| RGB | rgb(21, 90, 113) |
| HSL | hsl(195, 69%, 26%) |
| OKLCH | oklch(43.7% 0.075 225.4) |
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 #155A71 | 7.68:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #155A71 | 2.73:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #155A71 text on white | 7.68:1 | AAA | Lc 86.4 | Fine for body text |
| #155A71 text on black | 2.73:1 | Fails | Lc -15.7 | 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
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECF0
oklch(93.6% 0.013 221.4)
-
Step 200
200
#C9DDE5
oklch(88.5% 0.024 223.7)
-
Step 300
300
#A3C7D6
oklch(80.8% 0.044 225.1)
-
Step 400
400
#6FAAC2
oklch(70.6% 0.071 225.6)
-
Step 500
500
#4595B3
oklch(63.2% 0.09 225.6)
-
Step 600
600
#1D7F9E
oklch(55.7% 0.097 224.7)
-
Step 700
700
#0B6B87
oklch(49.2% 0.09 224.8)
-
Step 800
800 (this color)
#155A71
oklch(43.7% 0.075 225.4)
-
Step 900
900
#184859
oklch(37.7% 0.058 225.1)
-
Step 950
950
#102A34
oklch(27% 0.037 225.8)
#155A71 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) | #4D5872 | 0.056 |
| Deuteranopia (no green cones) | #414F71 | 0.050 |
| Tritanopia (no blue cones) | #006162 | 0.039 |
| Achromatopsia (no color) | #535353 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155A71
#155A71
oklch(43.7% 0.075 225.4)
- #74442D
#74442D
oklch(43.8% 0.075 45.8)
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 #155A71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.023
- Deep Sea Blue #015482 ΔE 0.039
- Deep Teal #00555A ΔE 0.041
- YInMn Blue #415A77 ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.045
- Light Navy #155084 ΔE 0.050
- Dark Aqua #05696B ΔE 0.052
- Dark Slate Gray #2F4F4F ΔE 0.058
Use #155A71 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.