#155E4D
Closest named color: Dark Green Blue (#1F6357). oklch(43.4% 0.075 173.3), rgb(21, 94, 77).
Aa
White text reads best on this color (7.66:1).
About this color
#155E4D is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 43%, its chroma 0.075 and its hue 173°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.022 away. White text reads best on it, at 7.66:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.74:1 |
| White text | 7.66:1 |
Values
| HEX | #155E4D |
| RGB | rgb(21, 94, 77) |
| HSL | hsl(166, 63%, 23%) |
| OKLCH | oklch(43.4% 0.075 173.3) |
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 #155E4D | 7.66:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #155E4D | 2.74:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #155E4D text on white | 7.66:1 | AAA | Lc 86.3 | Fine for body text |
| #155E4D text on black | 2.74:1 | Fails | Lc -15.8 | 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
#E2EDE9
oklch(93.7% 0.013 172.4)
-
Step 200
200
#CADFD8
oklch(88.6% 0.024 173.8)
-
Step 300
300
#A4CABE
oklch(80.8% 0.044 174)
-
Step 400
400
#71AF9D
oklch(70.7% 0.07 173.9)
-
Step 500
500
#479B85
oklch(63.1% 0.089 173.7)
-
Step 600
600
#1F866E
oklch(55.7% 0.098 172.9)
-
Step 700
700
#0D715C
oklch(49.1% 0.091 173.3)
-
Step 800
800 (this color)
#155E4D
oklch(43.4% 0.075 173.3)
-
Step 900
900
#194C3F
oklch(37.8% 0.059 173.3)
-
Step 950
950
#102C25
oklch(26.9% 0.037 174.8)
#155E4D 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) | #5B574C | 0.079 |
| Deuteranopia (no green cones) | #51504E | 0.075 |
| Tritanopia (no blue cones) | #005F59 | 0.019 |
| Achromatopsia (no color) | #535353 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155E4D
#155E4D
oklch(43.4% 0.075 173.3)
- #703F54
#703F54
oklch(43.4% 0.074 353.4)
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 #155E4D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.022
- Spruce #0A5F38 ΔE 0.035
- Pine #2B5D34 ΔE 0.037
- Dark Blue Green #005249 ΔE 0.042
- Deep Teal #00555A ΔE 0.043
- Petrol #005F6A ΔE 0.047
- Dark Aqua #05696B ΔE 0.051
- Dark Slate Gray #2F4F4F ΔE 0.053
Use #155E4D 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.