#155F5F
Closest named color: Petrol (#005F6A). oklch(44.3% 0.069 195), rgb(21, 95, 95).
Aa
White text reads best on this color (7.40:1).
About this color
#155F5F is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.069 and its hue 195°. 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 7.40:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.83:1 |
| White text | 7.40:1 |
Values
| HEX | #155F5F |
| RGB | rgb(21, 95, 95) |
| HSL | hsl(180, 64%, 23%) |
| OKLCH | oklch(44.3% 0.069 195) |
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 #155F5F | 7.40:1 | AAA | Lc -90.3 | Preferred for body text |
| Black text on #155F5F | 2.83:1 | Fails | Lc 18.6 | Dividers and decoration only |
| #155F5F text on white | 7.40:1 | AAA | Lc 85.4 | Fine for body text |
| #155F5F 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
#F2F7F6
oklch(97.2% 0.005 183)
-
Step 100
100
#E2ECEC
oklch(93.6% 0.011 197)
-
Step 200
200
#C9DEDE
oklch(88.5% 0.022 196.8)
-
Step 300
300
#A3C9C8
oklch(80.8% 0.04 194.4)
-
Step 400
400
#6FAEAD
oklch(70.8% 0.065 194.5)
-
Step 500
500
#439999
oklch(63.1% 0.082 195.3)
-
Step 600
600
#198383
oklch(55.5% 0.089 194.9)
-
Step 700
700
#046F6F
oklch(49.1% 0.083 194.8)
-
Step 800
800 (this color)
#155F5F
oklch(44.3% 0.069 195)
-
Step 900
900
#174A4A
oklch(37.6% 0.053 195.1)
-
Step 950
950
#0F2C2B
oklch(27.1% 0.035 192.2)
#155F5F 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) | #585A5F | 0.071 |
| Deuteranopia (no green cones) | #4D5260 | 0.067 |
| Tritanopia (no blue cones) | #00625F | 0.011 |
| Achromatopsia (no color) | #555555 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155F5F
#155F5F
oklch(44.3% 0.069 195)
- #744347
#744347
oklch(44.2% 0.068 15)
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 #155F5F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.019
- Dark Green Blue #1F6357 ΔE 0.022
- Dark Aqua #05696B ΔE 0.032
- Deep Teal #00555A ΔE 0.035
- Dark Slate Gray #2F4F4F ΔE 0.051
- Dark Blue Green #005249 ΔE 0.052
- Dark Aquamarine #017371 ΔE 0.062
- Dark Teal #014D4E ΔE 0.062
Use #155F5F 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.