#288D78
Closest named color: Viridian (#1E9167). oklch(58.1% 0.096 175.7), rgb(40, 141, 120).
Aa
Black text reads best on this color (5.17:1).
About this color
#288D78 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.096 and its hue 176°. Its hue sits on the cool side of the wheel. The nearest named color is Viridian (#1E9167), ΔE 0.032 away. Black text reads best on it, at 5.17:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Viridian (#1E9167) |
| Black text | 5.17:1 |
| White text | 4.06:1 |
Values
| HEX | #288D78 |
| RGB | rgb(40, 141, 120) |
| HSL | hsl(168, 56%, 35%) |
| OKLCH | oklch(58.1% 0.096 175.7) |
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 #288D78 | 4.06:1 | AA large text | Lc -73.0 | Content text, not long reading |
| Black text on #288D78 | 5.17:1 | AA | Lc 36.6 | Non-text elements, placeholder text |
| #288D78 text on white | 4.06:1 | AA large text | Lc 67.5 | Content text, not long reading |
| #288D78 text on black | 5.17:1 | AA | Lc -34.2 | 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
#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
#A4CABF
oklch(80.8% 0.043 175.7)
-
Step 400
400
#70AF9F
oklch(70.7% 0.069 176.4)
-
Step 500
500
#459B87
oklch(63.1% 0.089 175.7)
-
Step 600
600 (this color)
#288D78
oklch(58.1% 0.096 175.7)
-
Step 700
700
#09715E
oklch(49.1% 0.09 175.3)
-
Step 800
800
#105C4D
oklch(42.7% 0.074 175.6)
-
Step 900
900
#184C40
oklch(37.8% 0.059 174.9)
-
Step 950
950
#102C26
oklch(26.9% 0.036 177.5)
#288D78 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) | #888477 | 0.101 |
| Deuteranopia (no green cones) | #7A7A7A | 0.096 |
| Tritanopia (no blue cones) | #008F87 | 0.022 |
| Achromatopsia (no color) | #7E7E7E | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288D78
#288D78
oklch(58.1% 0.096 175.7)
- #A7617D
#A7617D
oklch(58% 0.097 355.1)
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 #288D78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Viridian #1E9167 ΔE 0.032
- Dark Cyan #008B8B ΔE 0.033
- Dusty Teal #4C9085 ΔE 0.036
- Teal Green #0A9396 ΔE 0.043
- Ocean Green #3D9973 ΔE 0.043
- Blue Green #0F9B8E ΔE 0.044
- Sea Green #2E8B57 ΔE 0.046
- Teal #008080 ΔE 0.049
Use #288D78 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.