#18A9CC
Closest named color: Turquoise Blue (#06B1C4). oklch(68.1% 0.12 220.3), rgb(24, 169, 204).
Aa
Black text reads best on this color (7.58:1).
About this color
#18A9CC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 68%, its chroma 0.120 and its hue 220°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.029 away. Black text reads best on it, at 7.58:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 7.58:1 |
| White text | 2.76:1 |
Values
| HEX | #18A9CC |
| RGB | rgb(24, 169, 204) |
| HSL | hsl(192, 79%, 45%) |
| OKLCH | oklch(68.1% 0.12 220.3) |
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 #18A9CC | 2.76:1 | Fails | Lc -58.1 | Large or bold text, headings |
| Black text on #18A9CC | 7.58:1 | AAA | Lc 51.1 | Large or bold text, headings |
| #18A9CC text on white | 2.76:1 | Fails | Lc 52.9 | Large or bold text, headings |
| #18A9CC text on black | 7.58:1 | AAA | Lc -49.0 | 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
#EFF7FA
oklch(97.1% 0.009 222.1)
-
Step 100
100
#DBEEF4
oklch(93.7% 0.022 218.6)
-
Step 200
200
#BCE0ED
oklch(88.5% 0.042 221.7)
-
Step 300
300
#88CCE3
oklch(80.8% 0.076 221.3)
-
Step 400
400 (this color)
#18A9CC
oklch(68.1% 0.12 220.3)
-
Step 500
500
#0099BA
oklch(63.2% 0.115 220.3)
-
Step 600
600
#00809C
oklch(55.5% 0.101 220.3)
-
Step 700
700
#006C84
oklch(49.2% 0.09 220.2)
-
Step 800
800
#00586D
oklch(42.6% 0.078 221.3)
-
Step 900
900
#004A5B
oklch(37.8% 0.069 219.8)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#18A9CC 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) | #94A4CE | 0.100 |
| Deuteranopia (no green cones) | #7E94CC | 0.089 |
| Tritanopia (no blue cones) | #00B4B4 | 0.055 |
| Achromatopsia (no color) | #9B9B9B | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18A9CC
#18A9CC
oklch(68.1% 0.12 220.3)
- #D77D5D
#D77D5D
oklch(68.1% 0.121 40.2)
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 #18A9CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.029
- Light Sea Green #20B2AA ΔE 0.064
- Greyblue #77A1B5 ΔE 0.067
- Cadet Blue #5F9EA0 ΔE 0.069
- Topaz #13BBAF ΔE 0.078
- Bluegrey #85A3B2 ΔE 0.083
- Faded Blue #658CBB ΔE 0.085
- Deep Sky Blue #00BFFF ΔE 0.086
Use #18A9CC 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.