#128B79
Closest named color: Dark Cyan (#008B8B). oklch(57.2% 0.101 179), rgb(18, 139, 121).
Aa
Black text reads best on this color (4.99:1).
About this color
#128B79 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 57%, its chroma 0.101 and its hue 179°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.028 away. Black text reads best on it, at 4.99:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 4.99:1 |
| White text | 4.20:1 |
Values
| HEX | #128B79 |
| RGB | rgb(18, 139, 121) |
| HSL | hsl(171, 77%, 31%) |
| OKLCH | oklch(57.2% 0.101 179) |
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 #128B79 | 4.20:1 | AA large text | Lc -74.0 | Content text, not long reading |
| Black text on #128B79 | 4.99:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #128B79 text on white | 4.20:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #128B79 text on black | 4.99:1 | AA | Lc -33.1 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F1F7F5
oklch(97.1% 0.007 174.4)
-
Step 100
100
#E1EDEA
oklch(93.6% 0.013 179.5)
-
Step 200
200
#C8DFD9
oklch(88.5% 0.026 178.3)
-
Step 300
300
#A2CBC1
oklch(81% 0.046 178.6)
-
Step 400
400
#6CB0A1
oklch(70.7% 0.073 178.4)
-
Step 500
500
#3D9C8A
oklch(63.1% 0.093 178.5)
-
Step 600
600 (this color)
#128B79
oklch(57.2% 0.101 179)
-
Step 700
700
#007162
oklch(49.1% 0.09 179.3)
-
Step 800
800
#015D50
oklch(42.8% 0.078 178.9)
-
Step 900
900
#124C42
oklch(37.7% 0.061 178.8)
-
Step 950
950
#0D2D27
oklch(27.1% 0.039 178.8)
#128B79 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) | #858278 | 0.107 |
| Deuteranopia (no green cones) | #76777A | 0.101 |
| Tritanopia (no blue cones) | #008D86 | 0.019 |
| Achromatopsia (no color) | #7B7B7B | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #128B79
#128B79
oklch(57.2% 0.101 179)
- #A75D77
#A75D77
oklch(57.1% 0.101 358.3)
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 #128B79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.028
- Viridian #1E9167 ΔE 0.037
- Teal #008080 ΔE 0.040
- Teal Green #0A9396 ΔE 0.044
- Dusty Teal #4C9085 ΔE 0.045
- Sea Green #2E8B57 ΔE 0.049
- Blue Green #0F9B8E ΔE 0.050
- Ocean Green #3D9973 ΔE 0.054
Use #128B79 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.