#155E57
Closest named color: Dark Green Blue (#1F6357). oklch(43.7% 0.07 185.5), rgb(21, 94, 87).
Aa
White text reads best on this color (7.57:1).
About this color
#155E57 is a dark, muted teal or cyan. In OKLCH its lightness is 44%, its chroma 0.070 and its hue 185°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.019 away. White text reads best on it, at 7.57:1.
| Hue family | Teals and cyans |
| Lightness | dark (44%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.77:1 |
| White text | 7.57:1 |
Values
| HEX | #155E57 |
| RGB | rgb(21, 94, 87) |
| HSL | hsl(174, 63%, 23%) |
| OKLCH | oklch(43.7% 0.07 185.5) |
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 #155E57 | 7.57:1 | AAA | Lc -90.8 | Preferred for body text |
| Black text on #155E57 | 2.77:1 | Fails | Lc 18.0 | Dividers and decoration only |
| #155E57 text on white | 7.57:1 | AAA | Lc 86.0 | Fine for body text |
| #155E57 text on black | 2.77:1 | Fails | Lc -16.0 | 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
#E2EDEB
oklch(93.7% 0.012 184.1)
-
Step 200
200
#CADEDB
oklch(88.5% 0.022 186)
-
Step 300
300
#A4CAC4
oklch(81% 0.041 184.7)
-
Step 400
400
#70AEA6
oklch(70.6% 0.065 185.6)
-
Step 500
500
#459A90
oklch(63.1% 0.084 185)
-
Step 600
600
#1D847B
oklch(55.6% 0.09 186)
-
Step 700
700
#0A7067
oklch(49.1% 0.084 185)
-
Step 800
800 (this color)
#155E57
oklch(43.7% 0.07 185.5)
-
Step 900
900
#184B46
oklch(37.7% 0.054 186.1)
-
Step 950
950
#102C29
oklch(27% 0.034 186.1)
#155E57 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) | #595857 | 0.074 |
| Deuteranopia (no green cones) | #4F5158 | 0.070 |
| Tritanopia (no blue cones) | #00605C | 0.010 |
| Achromatopsia (no color) | #545454 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155E57
#155E57
oklch(43.7% 0.07 185.5)
- #72414C
#72414C
oklch(43.8% 0.069 5.9)
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 #155E57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.019
- Petrol #005F6A ΔE 0.031
- Deep Teal #00555A ΔE 0.034
- Dark Aqua #05696B ΔE 0.040
- Dark Blue Green #005249 ΔE 0.044
- Dark Slate Gray #2F4F4F ΔE 0.048
- Spruce #0A5F38 ΔE 0.052
- Pine #2B5D34 ΔE 0.053
Use #155E57 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.