#288D9B
Closest named color: Teal Blue (#01889F). oklch(59.3% 0.091 208.6), rgb(40, 141, 155).
Aa
Black text reads best on this color (5.37:1).
About this color
#288D9B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.091 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.023 away. Black text reads best on it, at 5.37:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 5.37:1 |
| White text | 3.90:1 |
Values
| HEX | #288D9B |
| RGB | rgb(40, 141, 155) |
| HSL | hsl(187, 59%, 38%) |
| OKLCH | oklch(59.3% 0.091 208.6) |
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 #288D9B | 3.90:1 | AA large text | Lc -71.7 | Content text, not long reading |
| Black text on #288D9B | 5.37:1 | AA | Lc 37.9 | Non-text elements, placeholder text |
| #288D9B text on white | 3.90:1 | AA large text | Lc 66.2 | Content text, not long reading |
| #288D9B text on black | 5.37:1 | AA | Lc -35.5 | 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
#F1F6F7
oklch(97% 0.005 211)
-
Step 100
100
#E1ECEE
oklch(93.5% 0.012 209.8)
-
Step 200
200
#C9DEE1
oklch(88.6% 0.023 207.1)
-
Step 300
300
#A3C8CF
oklch(80.8% 0.041 210.4)
-
Step 400
400
#6EACB6
oklch(70.6% 0.065 208.7)
-
Step 500
500
#4298A4
oklch(63.2% 0.084 207.7)
-
Step 600
600 (this color)
#288D9B
oklch(59.3% 0.091 208.6)
-
Step 700
700
#006E7A
oklch(49.2% 0.085 207.9)
-
Step 800
800
#0B5963
oklch(42.6% 0.07 208.6)
-
Step 900
900
#164A51
oklch(37.8% 0.055 207.8)
-
Step 950
950
#0F2B2F
oklch(26.9% 0.034 207.9)
#288D9B 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) | #80889C | 0.087 |
| Deuteranopia (no green cones) | #707C9B | 0.079 |
| Tritanopia (no blue cones) | #009491 | 0.032 |
| Achromatopsia (no color) | #818181 | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288D9B
#288D9B
oklch(59.3% 0.091 208.6)
- #AE695F
#AE695F
oklch(59.4% 0.091 28.9)
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 #288D9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.023
- Teal Green #0A9396 ΔE 0.023
- Dark Cyan #008B8B ΔE 0.029
- Blue NCS #118AB2 ΔE 0.040
- Dusty Teal #4C9085 ΔE 0.043
- Sea #3C9992 ΔE 0.046
- Blue Green #0F9B8E ΔE 0.052
- Teal #008080 ΔE 0.055
Use #288D9B 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.