#288C78
Closest named color: Dark Cyan (#008B8B). oklch(57.8% 0.095 176.4), rgb(40, 140, 120).
Aa
Black text reads best on this color (5.11:1).
About this color
#288C78 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.095 and its hue 176°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.031 away. Black text reads best on it, at 5.11:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.11:1 |
| White text | 4.10:1 |
Values
| HEX | #288C78 |
| RGB | rgb(40, 140, 120) |
| HSL | hsl(168, 56%, 35%) |
| OKLCH | oklch(57.8% 0.095 176.4) |
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 #288C78 | 4.10:1 | AA large text | Lc -73.4 | Content text, not long reading |
| Black text on #288C78 | 5.11:1 | AA | Lc 36.2 | Non-text elements, placeholder text |
| #288C78 text on white | 4.10:1 | AA large text | Lc 67.9 | Content text, not long reading |
| #288C78 text on black | 5.11:1 | AA | Lc -33.8 | 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
#A4CAC0
oklch(80.9% 0.043 177.4)
-
Step 400
400
#71AF9F
oklch(70.7% 0.069 176.1)
-
Step 500
500
#469B88
oklch(63.1% 0.088 176.5)
-
Step 600
600 (this color)
#288C78
oklch(57.8% 0.095 176.4)
-
Step 700
700
#0B715F
oklch(49.2% 0.089 176.1)
-
Step 800
800
#115C4E
oklch(42.7% 0.073 176.7)
-
Step 900
900
#194B41
oklch(37.6% 0.056 177.6)
-
Step 950
950
#102C26
oklch(26.9% 0.036 177.5)
#288C78 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) | #878377 | 0.101 |
| Deuteranopia (no green cones) | #79797A | 0.096 |
| Tritanopia (no blue cones) | #008E86 | 0.021 |
| Achromatopsia (no color) | #7D7D7D | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288C78
#288C78
oklch(57.8% 0.095 176.4)
- #A6617B
#A6617B
oklch(57.8% 0.095 356.4)
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 #288C78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.031
- Viridian #1E9167 ΔE 0.034
- Dusty Teal #4C9085 ΔE 0.037
- Teal Green #0A9396 ΔE 0.044
- Teal #008080 ΔE 0.046
- Ocean Green #3D9973 ΔE 0.046
- Blue Green #0F9B8E ΔE 0.046
- Sea Green #2E8B57 ΔE 0.047
Use #288C78 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.