#288B73
Closest named color: Viridian (#1E9167). oklch(57.4% 0.097 173), rgb(40, 139, 115).
Aa
Black text reads best on this color (5.03:1).
About this color
#288B73 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 57%, its chroma 0.097 and its hue 173°. Its hue sits on the cool side of the wheel. The nearest named color is Viridian (#1E9167), ΔE 0.030 away. Black text reads best on it, at 5.03:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Viridian (#1E9167) |
| Black text | 5.03:1 |
| White text | 4.17:1 |
Values
| HEX | #288B73 |
| RGB | rgb(40, 139, 115) |
| HSL | hsl(165, 55%, 35%) |
| OKLCH | oklch(57.4% 0.097 173) |
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 #288B73 | 4.17:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #288B73 | 5.03:1 | AA | Lc 35.7 | Non-text elements, placeholder text |
| #288B73 text on white | 4.17:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #288B73 text on black | 5.03:1 | AA | Lc -33.2 | 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
#CADFD7
oklch(88.6% 0.025 170.9)
-
Step 300
300
#A5CABE
oklch(80.9% 0.043 173.5)
-
Step 400
400
#71AF9C
oklch(70.6% 0.07 172.9)
-
Step 500
500
#479B84
oklch(63.1% 0.089 172.9)
-
Step 600
600 (this color)
#288B73
oklch(57.4% 0.097 173)
-
Step 700
700
#0E715C
oklch(49.1% 0.09 173.3)
-
Step 800
800
#135C4B
oklch(42.7% 0.075 173.1)
-
Step 900
900
#194C3F
oklch(37.8% 0.059 173.3)
-
Step 950
950
#112C25
oklch(26.9% 0.036 174.4)
#288B73 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) | #868272 | 0.100 |
| Deuteranopia (no green cones) | #797875 | 0.097 |
| Tritanopia (no blue cones) | #008C84 | 0.026 |
| Achromatopsia (no color) | #7C7C7C | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288B73
#288B73
oklch(57.4% 0.097 173)
- #A55F7E
#A55F7E
oklch(57.4% 0.099 352.6)
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 #288B73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Viridian #1E9167 ΔE 0.030
- Dark Cyan #008B8B ΔE 0.037
- Sea Green #2E8B57 ΔE 0.040
- Dusty Teal #4C9085 ΔE 0.043
- Ocean Green #3D9973 ΔE 0.047
- Teal #008080 ΔE 0.048
- Dark Sage #598556 ΔE 0.049
- Teal Green #0A9396 ΔE 0.051
Use #288B73 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.