#155F74
Closest named color: Petrol (#005F6A). oklch(45.2% 0.076 221.9), rgb(21, 95, 116).
Aa
White text reads best on this color (7.18:1).
About this color
#155F74 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 45%, its chroma 0.076 and its hue 222°. 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 7.18:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.92:1 |
| White text | 7.18:1 |
Values
| HEX | #155F74 |
| RGB | rgb(21, 95, 116) |
| HSL | hsl(193, 69%, 27%) |
| OKLCH | oklch(45.2% 0.076 221.9) |
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 #155F74 | 7.18:1 | AAA | Lc -89.5 | Fine for body text |
| Black text on #155F74 | 2.92:1 | Fails | Lc 19.4 | Dividers and decoration only |
| #155F74 text on white | 7.18:1 | AAA | Lc 84.6 | Fine for body text |
| #155F74 text on black | 2.92:1 | Fails | Lc -17.4 | 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
#C8DDE5
oklch(88.4% 0.025 222.6)
-
Step 300
300
#A2C8D5
oklch(81% 0.044 220.7)
-
Step 400
400
#6DABC0
oklch(70.7% 0.071 221.5)
-
Step 500
500
#4096B1
oklch(63.2% 0.091 221.8)
-
Step 600
600
#12809C
oklch(55.7% 0.098 221.2)
-
Step 700
700
#006C85
oklch(49.2% 0.09 221.2)
-
Step 800
800 (this color)
#155F74
oklch(45.2% 0.076 221.9)
-
Step 900
900
#154858
oklch(37.6% 0.059 222.8)
-
Step 950
950
#0E2B34
oklch(27.2% 0.038 221.3)
#155F74 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) | #535C75 | 0.062 |
| Deuteranopia (no green cones) | #465374 | 0.055 |
| Tritanopia (no blue cones) | #006666 | 0.038 |
| Achromatopsia (no color) | #575757 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155F74
#155F74
oklch(45.2% 0.076 221.9)
- #794733
#794733
oklch(45.2% 0.076 42.3)
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 #155F74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.019
- Dark Aqua #05696B ΔE 0.039
- YInMn Blue #415A77 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.048
- Deep Teal #00555A ΔE 0.050
- Denim #3B638C ΔE 0.053
- Dark Green Blue #1F6357 ΔE 0.054
Use #155F74 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.