#155F53
Closest named color: Dark Green Blue (#1F6357). oklch(43.9% 0.072 179.3), rgb(21, 95, 83).
Aa
White text reads best on this color (7.51:1).
About this color
#155F53 is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 44%, its chroma 0.072 and its hue 179°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.016 away. White text reads best on it, at 7.51:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.79:1 |
| White text | 7.51:1 |
Values
| HEX | #155F53 |
| RGB | rgb(21, 95, 83) |
| HSL | hsl(170, 64%, 23%) |
| OKLCH | oklch(43.9% 0.072 179.3) |
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 #155F53 | 7.51:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #155F53 | 2.79:1 | Fails | Lc 18.2 | Dividers and decoration only |
| #155F53 text on white | 7.51:1 | AAA | Lc 85.8 | Fine for body text |
| #155F53 text on black | 2.79:1 | Fails | Lc -16.2 | 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
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E2EDEA
oklch(93.7% 0.012 178)
-
Step 200
200
#C9DFD9
oklch(88.6% 0.025 177.6)
-
Step 300
300
#A4CAC1
oklch(80.9% 0.042 179.2)
-
Step 400
400
#70AFA1
oklch(70.7% 0.068 178.6)
-
Step 500
500
#459B8B
oklch(63.2% 0.087 179.3)
-
Step 600
600
#1C8575
oklch(55.6% 0.094 179.7)
-
Step 700
700
#087162
oklch(49.2% 0.088 179.1)
-
Step 800
800 (this color)
#155F53
oklch(43.9% 0.072 179.3)
-
Step 900
900
#184B42
oklch(37.6% 0.056 179.4)
-
Step 950
950
#102C27
oklch(27% 0.035 180.2)
#155F53 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) | #5B5953 | 0.077 |
| Deuteranopia (no green cones) | #515154 | 0.074 |
| Tritanopia (no blue cones) | #00615B | 0.013 |
| Achromatopsia (no color) | #545454 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155F53
#155F53
oklch(43.9% 0.072 179.3)
- #724051
#724051
oklch(43.7% 0.073 358.7)
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 #155F53, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.016
- Petrol #005F6A ΔE 0.038
- Deep Teal #00555A ΔE 0.040
- Dark Aqua #05696B ΔE 0.042
- Spruce #0A5F38 ΔE 0.044
- Dark Blue Green #005249 ΔE 0.045
- Pine #2B5D34 ΔE 0.045
- Dark Slate Gray #2F4F4F ΔE 0.052
Use #155F53 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.