#288A7B
Closest named color: Dark Cyan (#008B8B). oklch(57.4% 0.092 180.5), rgb(40, 138, 123).
Aa
Black text reads best on this color (5.01:1).
About this color
#288A7B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 57%, its chroma 0.092 and its hue 180°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.025 away. Black text reads best on it, at 5.01:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.01:1 |
| White text | 4.19:1 |
Values
| HEX | #288A7B |
| RGB | rgb(40, 138, 123) |
| HSL | hsl(171, 55%, 35%) |
| OKLCH | oklch(57.4% 0.092 180.5) |
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 #288A7B | 4.19:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #288A7B | 5.01:1 | AA | Lc 35.5 | Non-text elements, placeholder text |
| #288A7B text on white | 4.19:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #288A7B text on black | 5.01:1 | AA | Lc -33.1 | 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
#E2EDEA
oklch(93.7% 0.012 178)
-
Step 200
200
#CADEDA
oklch(88.5% 0.022 182.5)
-
Step 300
300
#A5CAC2
oklch(81% 0.041 180.6)
-
Step 400
400
#71AEA2
oklch(70.6% 0.066 180.5)
-
Step 500
500
#479A8C
oklch(63.1% 0.084 180.9)
-
Step 600
600 (this color)
#288A7B
oklch(57.4% 0.092 180.5)
-
Step 700
700
#0F7063
oklch(49.1% 0.085 180.7)
-
Step 800
800
#135B51
oklch(42.6% 0.07 181.3)
-
Step 900
900
#194B43
oklch(37.7% 0.055 180.9)
-
Step 950
950
#112C27
oklch(27% 0.035 179.9)
#288A7B 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) | #84827A | 0.097 |
| Deuteranopia (no green cones) | #76787C | 0.091 |
| Tritanopia (no blue cones) | #008C85 | 0.016 |
| Achromatopsia (no color) | #7C7C7C | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288A7B
#288A7B
oklch(57.4% 0.092 180.5)
- #A56176
#A56176
oklch(57.5% 0.092 0.5)
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 #288A7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.025
- Dusty Teal #4C9085 ΔE 0.037
- Teal #008080 ΔE 0.038
- Teal Green #0A9396 ΔE 0.041
- Viridian #1E9167 ΔE 0.043
- Blue Green #0F9B8E ΔE 0.050
- Sea #3C9992 ΔE 0.054
- Bluegreen #017A79 ΔE 0.054
Use #288A7B 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.