#18B1BF
Closest named color: Turquoise Blue (#06B1C4). oklch(69.5% 0.115 205.1), rgb(24, 177, 191).
Aa
Black text reads best on this color (8.08:1).
About this color
#18B1BF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 70%, its chroma 0.115 and its hue 205°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.008 away. Black text reads best on it, at 8.08:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.08:1 |
| White text | 2.59:1 |
Values
| HEX | #18B1BF |
| RGB | rgb(24, 177, 191) |
| HSL | hsl(185, 78%, 42%) |
| OKLCH | oklch(69.5% 0.115 205.1) |
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 #18B1BF | 2.59:1 | Fails | Lc -55.4 | Large or bold text, headings |
| Black text on #18B1BF | 8.08:1 | AAA | Lc 53.8 | Large or bold text, headings |
| #18B1BF text on white | 2.59:1 | Fails | Lc 50.2 | Large or bold text, headings |
| #18B1BF text on black | 8.08:1 | AAA | Lc -51.7 | 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
#BBE1E6
oklch(88.4% 0.04 206.2)
-
Step 300
300
#87CFD7
oklch(81% 0.073 204.7)
-
Step 400
400 (this color)
#18B1BF
oklch(69.5% 0.115 205.1)
-
Step 500
500
#009CA8
oklch(63.2% 0.108 204.4)
-
Step 600
600
#00838E
oklch(55.7% 0.095 205.2)
-
Step 700
700
#006E77
oklch(49.1% 0.084 204.7)
-
Step 800
800
#005A62
oklch(42.7% 0.073 205.3)
-
Step 900
900
#004B52
oklch(37.7% 0.064 205.5)
-
Step 950
950
#002D31
oklch(27.1% 0.046 204.1)
#18B1BF 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) | #A1A9C0 | 0.113 |
| Deuteranopia (no green cones) | #8C9ABF | 0.104 |
| Tritanopia (no blue cones) | #00B9B5 | 0.031 |
| Achromatopsia (no color) | #A1A1A1 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18B1BF
#18B1BF
oklch(69.5% 0.115 205.1)
- #DB7F78
#DB7F78
oklch(69.4% 0.115 25.1)
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 #18B1BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.008
- Light Sea Green #20B2AA ΔE 0.033
- Topaz #13BBAF ΔE 0.043
- Cadet Blue #5F9EA0 ΔE 0.064
- Greeny Blue #42B395 ΔE 0.064
- Greyblue #77A1B5 ΔE 0.070
- Dull Teal #5F9E8F ΔE 0.077
- Persian Green #2A9D8F ΔE 0.078
Use #18B1BF 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.