#18A5B9
Closest named color: Turquoise Blue (#06B1C4). oklch(66.3% 0.111 210.4), rgb(24, 165, 185).
Aa
Black text reads best on this color (7.12:1).
About this color
#18A5B9 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.111 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.034 away. Black text reads best on it, at 7.12:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 7.12:1 |
| White text | 2.94:1 |
Values
| HEX | #18A5B9 |
| RGB | rgb(24, 165, 185) |
| HSL | hsl(187, 77%, 41%) |
| OKLCH | oklch(66.3% 0.111 210.4) |
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 #18A5B9 | 2.94:1 | Fails | Lc -60.8 | Content text, not long reading |
| Black text on #18A5B9 | 7.12:1 | AAA | Lc 48.6 | Large or bold text, headings |
| #18A5B9 text on white | 2.94:1 | Fails | Lc 55.5 | Large or bold text, headings |
| #18A5B9 text on black | 7.12:1 | AAA | Lc -46.3 | 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 500.
-
Step 50
50
#F0F7F8
oklch(97.1% 0.008 207.1)
-
Step 100
100
#DFEDF0
oklch(93.7% 0.015 212)
-
Step 200
200
#C3DFE4
oklch(88.5% 0.03 209.6)
-
Step 300
300
#98CBD4
oklch(80.9% 0.054 209.6)
-
Step 400
400
#58AFBF
oklch(70.6% 0.087 211.1)
-
Step 500
500 (this color)
#18A5B9
oklch(66.3% 0.111 210.4)
-
Step 600
600
#008293
oklch(55.6% 0.096 210.7)
-
Step 700
700
#006D7C
oklch(49% 0.085 211.2)
-
Step 800
800
#005A66
oklch(42.9% 0.074 210.4)
-
Step 900
900
#004B55
oklch(37.8% 0.065 210)
-
Step 950
950
#012C33
oklch(26.9% 0.046 211.3)
#18A5B9 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) | #949FBA | 0.103 |
| Deuteranopia (no green cones) | #8090B9 | 0.094 |
| Tritanopia (no blue cones) | #00AEAB | 0.039 |
| Achromatopsia (no color) | #969696 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18A5B9
#18A5B9
oklch(66.3% 0.111 210.4)
- #CE7869
#CE7869
oklch(66.3% 0.111 30.8)
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 #18A5B9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.034
- Cadet Blue #5F9EA0 ΔE 0.050
- Light Sea Green #20B2AA ΔE 0.051
- Sea #3C9992 ΔE 0.058
- Persian Green #2A9D8F ΔE 0.061
- Blue Green #0F9B8E ΔE 0.065
- Greyblue #77A1B5 ΔE 0.066
- Teal Green #0A9396 ΔE 0.066
Use #18A5B9 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.