#155B74
Closest named color: Petrol (#005F6A). oklch(44.2% 0.077 227.2), rgb(21, 91, 116).
Aa
White text reads best on this color (7.55:1).
About this color
#155B74 is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 44%, its chroma 0.077 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.025 away. White text reads best on it, at 7.55:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.78:1 |
| White text | 7.55:1 |
Values
| HEX | #155B74 |
| RGB | rgb(21, 91, 116) |
| HSL | hsl(196, 69%, 27%) |
| OKLCH | oklch(44.2% 0.077 227.2) |
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 #155B74 | 7.55:1 | AAA | Lc -90.7 | Preferred for body text |
| Black text on #155B74 | 2.78:1 | Fails | Lc 18.1 | Dividers and decoration only |
| #155B74 text on white | 7.55:1 | AAA | Lc 85.9 | Fine for body text |
| #155B74 text on black | 2.78:1 | Fails | Lc -16.1 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C9DDE6
oklch(88.5% 0.025 226.5)
-
Step 300
300
#A3C7D8
oklch(80.9% 0.045 228.2)
-
Step 400
400
#6FAAC4
oklch(70.7% 0.072 227.6)
-
Step 500
500
#4394B5
oklch(63% 0.093 227.8)
-
Step 600
600
#1A7EA1
oklch(55.5% 0.101 227.7)
-
Step 700
700
#066A8A
oklch(49% 0.094 228)
-
Step 800
800 (this color)
#155B74
oklch(44.2% 0.077 227.2)
-
Step 900
900
#17485A
oklch(37.8% 0.06 226.2)
-
Step 950
950
#0F2A35
oklch(27% 0.038 227.5)
#155B74 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) | #4E5975 | 0.057 |
| Deuteranopia (no green cones) | #415074 | 0.049 |
| Tritanopia (no blue cones) | #006263 | 0.042 |
| Achromatopsia (no color) | #545454 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155B74
#155B74
oklch(44.2% 0.077 227.2)
- #75452C
#75452C
oklch(44.2% 0.076 47.6)
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 #155B74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.025
- Deep Sea Blue #015482 ΔE 0.037
- YInMn Blue #415A77 ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.041
- Deep Teal #00555A ΔE 0.046
- Light Navy #155084 ΔE 0.048
- Dark Aqua #05696B ΔE 0.051
- Dusk Blue #26538D ΔE 0.055
Use #155B74 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.