#288F77
Closest named color: Viridian (#1E9167). oklch(58.6% 0.099 173.6), rgb(40, 143, 119).
Aa
Black text reads best on this color (5.28:1).
About this color
#288F77 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.099 and its hue 174°. Its hue sits on the cool side of the wheel. The nearest named color is Viridian (#1E9167), ΔE 0.027 away. Black text reads best on it, at 5.28:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Viridian (#1E9167) |
| Black text | 5.28:1 |
| White text | 3.97:1 |
Values
| HEX | #288F77 |
| RGB | rgb(40, 143, 119) |
| HSL | hsl(166, 56%, 36%) |
| OKLCH | oklch(58.6% 0.099 173.6) |
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 #288F77 | 3.97:1 | AA large text | Lc -72.2 | Content text, not long reading |
| Black text on #288F77 | 5.28:1 | AA | Lc 37.4 | Non-text elements, placeholder text |
| #288F77 text on white | 3.97:1 | AA large text | Lc 66.7 | Content text, not long reading |
| #288F77 text on black | 5.28:1 | AA | Lc -34.9 | 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
#C9DFD8
oklch(88.5% 0.025 174.7)
-
Step 300
300
#A4CBBE
oklch(81% 0.045 172.8)
-
Step 400
400
#70B09D
oklch(70.8% 0.072 173.4)
-
Step 500
500
#449C85
oklch(63.2% 0.092 173.5)
-
Step 600
600 (this color)
#288F77
oklch(58.6% 0.099 173.6)
-
Step 700
700
#05715C
oklch(49% 0.092 173.7)
-
Step 800
800
#0E5C4B
oklch(42.6% 0.076 173.5)
-
Step 900
900
#174C3F
oklch(37.8% 0.06 173.7)
-
Step 950
950
#102C25
oklch(26.9% 0.037 174.8)
#288F77 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) | #8A8676 | 0.103 |
| Deuteranopia (no green cones) | #7C7B79 | 0.100 |
| Tritanopia (no blue cones) | #009188 | 0.025 |
| Achromatopsia (no color) | #808080 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288F77
#288F77
oklch(58.6% 0.099 173.6)
- #A96280
#A96280
oklch(58.5% 0.099 353.8)
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 #288F77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Viridian #1E9167 ΔE 0.027
- Dusty Teal #4C9085 ΔE 0.036
- Ocean Green #3D9973 ΔE 0.037
- Dark Cyan #008B8B ΔE 0.038
- Blue Green #0F9B8E ΔE 0.041
- Sea Green #2E8B57 ΔE 0.044
- Teal Green #0A9396 ΔE 0.045
- Persian Green #2A9D8F ΔE 0.048
Use #288F77 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.