#18CBB2
Closest named color: Medium Aquamarine (#66CDAA). oklch(75.6% 0.135 179.4), rgb(24, 203, 178).
Aa
Black text reads best on this color (10.22:1).
About this color
#18CBB2 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.135 and its hue 179°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.039 away. Black text reads best on it, at 10.22:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.22:1 |
| White text | 2.05:1 |
Values
| HEX | #18CBB2 |
| RGB | rgb(24, 203, 178) |
| HSL | hsl(172, 79%, 45%) |
| OKLCH | oklch(75.6% 0.135 179.4) |
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 #18CBB2 | 2.05:1 | Fails | Lc -44.0 | Non-text elements, placeholder text |
| Black text on #18CBB2 | 10.22:1 | AAA | Lc 64.5 | Content text, not long reading |
| #18CBB2 text on white | 2.05:1 | Fails | Lc 39.5 | Non-text elements, placeholder text |
| #18CBB2 text on black | 10.22:1 | AAA | Lc -62.9 | Content text, not long reading |
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 400.
-
Step 50
50
#EEF8F6
oklch(97.1% 0.011 182.9)
-
Step 100
100
#D9F0EA
oklch(93.7% 0.025 178.4)
-
Step 200
200
#B9E4DA
oklch(88.6% 0.047 179.4)
-
Step 300
300
#81D3C2
oklch(80.9% 0.084 179.3)
-
Step 400
400 (this color)
#18CBB2
oklch(75.6% 0.135 179.4)
-
Step 500
500
#00A08B
oklch(63.2% 0.115 179)
-
Step 600
600
#008675
oklch(55.5% 0.101 179.7)
-
Step 700
700
#007162
oklch(49.1% 0.09 179.3)
-
Step 800
800
#005D50
oklch(42.8% 0.078 178.9)
-
Step 900
900
#004D43
oklch(37.7% 0.068 180.3)
-
Step 950
950
#002E27
oklch(27% 0.049 179.5)
#18CBB2 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) | #C2BEB1 | 0.142 |
| Deuteranopia (no green cones) | #ADAEB4 | 0.136 |
| Tritanopia (no blue cones) | #00CFC3 | 0.023 |
| Achromatopsia (no color) | #B5B5B5 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18CBB2
#18CBB2
oklch(75.6% 0.135 179.4)
- #F489AD
#F489AD
oklch(75.5% 0.135 359.3)
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 #18CBB2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.039
- Dark Turquoise #00CED1 ΔE 0.043
- Medium Turquoise #48D1CC ΔE 0.045
- Topaz #13BBAF ΔE 0.046
- Emerald #06D6A0 ΔE 0.047
- Greenblue #23C48B ΔE 0.052
- Green Blue #01C08D ΔE 0.054
- Seafoam Blue #78D1B6 ΔE 0.059
Use #18CBB2 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.