#18B5A3
Closest named color: Light Sea Green (#20B2AA). oklch(69.6% 0.121 182.3), rgb(24, 181, 163).
Aa
Black text reads best on this color (8.17:1).
About this color
#18B5A3 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 70%, its chroma 0.121 and its hue 182°. Its hue sits on the cool side of the wheel. The nearest named color is Light Sea Green (#20B2AA), ΔE 0.016 away. Black text reads best on it, at 8.17:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Light Sea Green (#20B2AA) |
| Black text | 8.17:1 |
| White text | 2.56:1 |
Values
| HEX | #18B5A3 |
| RGB | rgb(24, 181, 163) |
| HSL | hsl(173, 77%, 40%) |
| OKLCH | oklch(69.6% 0.121 182.3) |
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 #18B5A3 | 2.56:1 | Fails | Lc -54.8 | Large or bold text, headings |
| Black text on #18B5A3 | 8.17:1 | AAA | Lc 54.3 | Large or bold text, headings |
| #18B5A3 text on white | 2.56:1 | Fails | Lc 49.7 | Large or bold text, headings |
| #18B5A3 text on black | 8.17:1 | AAA | Lc -52.2 | 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
#EFF8F6
oklch(97.2% 0.01 181.4)
-
Step 100
100
#DBEFEB
oklch(93.6% 0.022 182.5)
-
Step 200
200
#BCE3DB
oklch(88.6% 0.042 181.5)
-
Step 300
300
#88D1C4
oklch(80.9% 0.075 181.9)
-
Step 400
400 (this color)
#18B5A3
oklch(69.6% 0.121 182.3)
-
Step 500
500
#009F8F
oklch(63.1% 0.113 182.5)
-
Step 600
600
#008678
oklch(55.6% 0.1 182.2)
-
Step 700
700
#007165
oklch(49.2% 0.088 182.2)
-
Step 800
800
#005C52
oklch(42.6% 0.076 182.2)
-
Step 900
900
#004D44
oklch(37.7% 0.068 181.7)
-
Step 950
950
#002E28
oklch(27% 0.049 181.5)
#18B5A3 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) | #ACAAA2 | 0.128 |
| Deuteranopia (no green cones) | #999CA5 | 0.121 |
| Tritanopia (no blue cones) | #00B9AF | 0.018 |
| Achromatopsia (no color) | #A2A2A2 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #18B5A3
#18B5A3
oklch(69.6% 0.121 182.3)
- #DA7B97
#DA7B97
oklch(69.5% 0.121 1.8)
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 #18B5A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Sea Green #20B2AA ΔE 0.016
- Topaz #13BBAF ΔE 0.021
- Greeny Blue #42B395 ΔE 0.022
- Green Blue #01C08D ΔE 0.052
- Turquoise Blue #06B1C4 ΔE 0.054
- Bluey Green #2BB179 ΔE 0.057
- Dark Seafoam #1FB57A ΔE 0.059
- Dark Seafoam Green #3EAF76 ΔE 0.059
Use #18B5A3 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.