#289D99
Closest named color: Sea (#3C9992). oklch(63.3% 0.099 191.5), rgb(40, 157, 153).
Aa
Black text reads best on this color (6.37:1).
About this color
#289D99 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 63%, its chroma 0.099 and its hue 191°. Its hue sits on the cool side of the wheel. The nearest named color is Sea (#3C9992), ΔE 0.015 away. Black text reads best on it, at 6.37:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Sea (#3C9992) |
| Black text | 6.37:1 |
| White text | 3.29:1 |
Values
| HEX | #289D99 |
| RGB | rgb(40, 157, 153) |
| HSL | hsl(178, 59%, 39%) |
| OKLCH | oklch(63.3% 0.099 191.5) |
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 #289D99 | 3.29:1 | AA large text | Lc -65.4 | Content text, not long reading |
| Black text on #289D99 | 6.37:1 | AA | Lc 44.1 | Non-text elements, placeholder text |
| #289D99 text on white | 3.29:1 | AA large text | Lc 59.9 | Large or bold text, headings |
| #289D99 text on black | 6.37:1 | AA | Lc -41.8 | 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 500.
-
Step 50
50
#F1F7F6
oklch(97.1% 0.006 185.3)
-
Step 100
100
#E0EDEC
oklch(93.6% 0.014 191.4)
-
Step 200
200
#C6DFDD
oklch(88.5% 0.027 190.8)
-
Step 300
300
#9DCBC8
oklch(80.9% 0.048 191.3)
-
Step 400
400
#62B0AC
oklch(70.6% 0.078 191.2)
-
Step 500
500 (this color)
#289D99
oklch(63.3% 0.099 191.5)
-
Step 600
600
#008581
oklch(55.7% 0.096 191.1)
-
Step 700
700
#00706D
oklch(49.2% 0.085 191.5)
-
Step 800
800
#005B59
oklch(42.6% 0.073 192.2)
-
Step 900
900
#004C4A
oklch(37.6% 0.065 191.7)
-
Step 950
950
#072D2B
oklch(27.1% 0.041 189.9)
#289D99 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) | #939599 | 0.104 |
| Deuteranopia (no green cones) | #83889A | 0.099 |
| Tritanopia (no blue cones) | #00A29B | 0.015 |
| Achromatopsia (no color) | #8E8E8E | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #289D99
#289D99
oklch(63.3% 0.099 191.5)
- #BE707B
#BE707B
oklch(63.4% 0.099 11.2)
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 #289D99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea #3C9992 ΔE 0.015
- Persian Green #2A9D8F ΔE 0.015
- Blue Green #0F9B8E ΔE 0.020
- Teal Green #0A9396 ΔE 0.033
- Grey Teal #5E9B8A ΔE 0.040
- Dull Teal #5F9E8F ΔE 0.041
- Dusty Teal #4C9085 ΔE 0.042
- Cadet Blue #5F9EA0 ΔE 0.043
Use #289D99 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.