#288B9D
Closest named color: Teal Blue (#01889F). oklch(58.9% 0.091 212.6), rgb(40, 139, 157).
Aa
Black text reads best on this color (5.27:1).
About this color
#288B9D is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.091 and its hue 213°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.017 away. Black text reads best on it, at 5.27:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 5.27:1 |
| White text | 3.98:1 |
Values
| HEX | #288B9D |
| RGB | rgb(40, 139, 157) |
| HSL | hsl(189, 59%, 39%) |
| OKLCH | oklch(58.9% 0.091 212.6) |
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 #288B9D | 3.98:1 | AA large text | Lc -72.3 | Content text, not long reading |
| Black text on #288B9D | 5.27:1 | AA | Lc 37.2 | Non-text elements, placeholder text |
| #288B9D text on white | 3.98:1 | AA large text | Lc 66.8 | Content text, not long reading |
| #288B9D text on black | 5.27:1 | AA | Lc -34.8 | 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
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECEE
oklch(93.5% 0.012 209.8)
-
Step 200
200
#C9DDE2
oklch(88.4% 0.022 214.4)
-
Step 300
300
#A3C8D0
oklch(80.9% 0.041 212.3)
-
Step 400
400
#6FACB9
oklch(70.8% 0.066 212.6)
-
Step 500
500
#4397A7
oklch(63.1% 0.084 212)
-
Step 600
600 (this color)
#288B9D
oklch(58.9% 0.091 212.6)
-
Step 700
700
#036D7D
oklch(49.1% 0.085 212.4)
-
Step 800
800
#0D5966
oklch(42.8% 0.071 212.7)
-
Step 900
900
#174953
oklch(37.7% 0.055 213.4)
-
Step 950
950
#0F2B30
oklch(27% 0.035 210.9)
#288B9D 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) | #7D869E | 0.084 |
| Deuteranopia (no green cones) | #6D7A9D | 0.076 |
| Tritanopia (no blue cones) | #009291 | 0.034 |
| Achromatopsia (no color) | #7F7F7F | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288B9D
#288B9D
oklch(58.9% 0.091 212.6)
- #AC685A
#AC685A
oklch(58.9% 0.091 32.4)
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 #288B9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.017
- Teal Green #0A9396 ΔE 0.030
- Dark Cyan #008B8B ΔE 0.033
- Blue NCS #118AB2 ΔE 0.034
- Cerulean #457B9D ΔE 0.049
- Dusty Teal #4C9085 ΔE 0.050
- Ocean #017B92 ΔE 0.052
- Stormy Blue #507B9C ΔE 0.052
Use #288B9D 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.