#128778
Closest named color: Dark Cyan (#008B8B). oklch(56.1% 0.097 181.1), rgb(18, 135, 120).
Aa
Black text reads best on this color (4.76:1).
About this color
#128778 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 56%, its chroma 0.097 and its hue 181°. 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 4.76:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 4.76:1 |
| White text | 4.40:1 |
Values
| HEX | #128778 |
| RGB | rgb(18, 135, 120) |
| HSL | hsl(172, 76%, 30%) |
| OKLCH | oklch(56.1% 0.097 181.1) |
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 #128778 | 4.40:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #128778 | 4.76:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #128778 text on white | 4.40:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #128778 text on black | 4.76:1 | AA | Lc -31.6 | 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
#F1F7F6
oklch(97.1% 0.006 185.3)
-
Step 100
100
#E1EDEA
oklch(93.6% 0.013 179.5)
-
Step 200
200
#C9DFDA
oklch(88.6% 0.024 180.6)
-
Step 300
300
#A3CAC2
oklch(80.9% 0.043 181.3)
-
Step 400
400
#6DAFA3
oklch(70.6% 0.07 181.4)
-
Step 500
500
#409B8D
oklch(63.1% 0.089 181.6)
-
Step 600
600 (this color)
#128778
oklch(56.1% 0.097 181.1)
-
Step 700
700
#007164
oklch(49.2% 0.089 181.2)
-
Step 800
800
#065C51
oklch(42.7% 0.075 180.8)
-
Step 900
900
#144C43
oklch(37.8% 0.059 180.1)
-
Step 950
950
#0E2C27
oklch(26.9% 0.037 180.8)
#128778 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) | #807E77 | 0.103 |
| Deuteranopia (no green cones) | #727479 | 0.097 |
| Tritanopia (no blue cones) | #008A82 | 0.015 |
| Achromatopsia (no color) | #787878 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #128778
#128778
oklch(56.1% 0.097 181.1)
- #A35B71
#A35B71
oklch(56.1% 0.097 1.1)
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 #128778, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.028
- Teal #008080 ΔE 0.029
- Bluegreen #017A79 ΔE 0.043
- Viridian #1E9167 ΔE 0.046
- Teal Green #0A9396 ΔE 0.050
- Dusty Teal #4C9085 ΔE 0.051
- Deep Aqua #08787F ΔE 0.052
- Sea Green #2E8B57 ΔE 0.054
Use #128778 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.