#18B3BF
Closest named color: Turquoise Blue (#06B1C4). oklch(70% 0.116 203.6), rgb(24, 179, 191).
Aa
Black text reads best on this color (8.23:1).
About this color
#18B3BF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 70%, its chroma 0.116 and its hue 204°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.011 away. Black text reads best on it, at 8.23:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.23:1 |
| White text | 2.54:1 |
Values
| HEX | #18B3BF |
| RGB | rgb(24, 179, 191) |
| HSL | hsl(184, 78%, 42%) |
| OKLCH | oklch(70% 0.116 203.6) |
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 #18B3BF | 2.54:1 | Fails | Lc -54.5 | Large or bold text, headings |
| Black text on #18B3BF | 8.23:1 | AAA | Lc 54.6 | Large or bold text, headings |
| #18B3BF text on white | 2.54:1 | Fails | Lc 49.4 | Large or bold text, headings |
| #18B3BF text on black | 8.23:1 | AAA | Lc -52.6 | Large or bold text, headings |
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
#EEF7F8
oklch(97% 0.01 204.9)
-
Step 100
100
#DBEEF0
oklch(93.6% 0.02 204.4)
-
Step 200
200
#BBE1E5
oklch(88.4% 0.04 204.3)
-
Step 300
300
#87CFD6
oklch(81% 0.072 203.6)
-
Step 400
400 (this color)
#18B3BF
oklch(70% 0.116 203.6)
-
Step 500
500
#009CA7
oklch(63.1% 0.108 203.6)
-
Step 600
600
#00838C
oklch(55.6% 0.095 203.3)
-
Step 700
700
#006E76
oklch(49.1% 0.084 203.6)
-
Step 800
800
#005A61
oklch(42.6% 0.073 204)
-
Step 900
900
#004B51
oklch(37.6% 0.064 204)
-
Step 950
950
#002D31
oklch(27.1% 0.046 204.1)
#18B3BF 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) | #A4ABC0 | 0.116 |
| Deuteranopia (no green cones) | #8E9CBF | 0.105 |
| Tritanopia (no blue cones) | #00BBB6 | 0.030 |
| Achromatopsia (no color) | #A2A2A2 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18B3BF
#18B3BF
oklch(70% 0.116 203.6)
- #DD807C
#DD807C
oklch(69.9% 0.116 23.1)
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 #18B3BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.011
- Light Sea Green #20B2AA ΔE 0.031
- Topaz #13BBAF ΔE 0.038
- Greeny Blue #42B395 ΔE 0.062
- Cadet Blue #5F9EA0 ΔE 0.067
- Greyblue #77A1B5 ΔE 0.072
- Dark Turquoise #00CED1 ΔE 0.075
- Dull Teal #5F9E8F ΔE 0.079
Use #18B3BF 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.