#42B3A4
Closest named color: Light Sea Green (#20B2AA). oklch(69.9% 0.104 182.9), rgb(66, 179, 164).
Aa
Black text reads best on this color (8.21:1).
About this color
#42B3A4 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 70%, its chroma 0.104 and its hue 183°. Its hue sits on the cool side of the wheel. The nearest named color is Light Sea Green (#20B2AA), ΔE 0.017 away. Black text reads best on it, at 8.21:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Light Sea Green (#20B2AA) |
| Black text | 8.21:1 |
| White text | 2.55:1 |
Values
| HEX | #42B3A4 |
| RGB | rgb(66, 179, 164) |
| HSL | hsl(172, 46%, 48%) |
| OKLCH | oklch(69.9% 0.104 182.9) |
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 #42B3A4 | 2.55:1 | Fails | Lc -54.8 | Large or bold text, headings |
| Black text on #42B3A4 | 8.21:1 | AAA | Lc 54.3 | Large or bold text, headings |
| #42B3A4 text on white | 2.55:1 | Fails | Lc 49.7 | Large or bold text, headings |
| #42B3A4 text on black | 8.21:1 | 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
#EFF7F6
oklch(97% 0.009 188.1)
-
Step 100
100
#DDEEEB
oklch(93.6% 0.018 184.3)
-
Step 200
200
#C0E1DB
oklch(88.4% 0.036 183.3)
-
Step 300
300
#91CFC4
oklch(80.9% 0.065 182.4)
-
Step 400
400 (this color)
#42B3A4
oklch(69.9% 0.104 182.9)
-
Step 500
500
#009F90
oklch(63.1% 0.112 183.2)
-
Step 600
600
#008679
oklch(55.7% 0.099 183.1)
-
Step 700
700
#007065
oklch(49% 0.087 183.1)
-
Step 800
800
#005C53
oklch(42.6% 0.076 183.4)
-
Step 900
900
#004D45
oklch(37.7% 0.067 183.1)
-
Step 950
950
#002E29
oklch(27.1% 0.048 183.6)
#42B3A4 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) | #ABA9A3 | 0.110 |
| Deuteranopia (no green cones) | #9A9DA5 | 0.104 |
| Tritanopia (no blue cones) | #00B6AE | 0.021 |
| Achromatopsia (no color) | #A2A2A2 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42B3A4
#42B3A4
oklch(69.9% 0.104 182.9)
- #D48298
#D48298
oklch(69.9% 0.104 2.8)
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 #42B3A4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Sea Green #20B2AA ΔE 0.017
- Greeny Blue #42B395 ΔE 0.022
- Topaz #13BBAF ΔE 0.025
- Turquoise Blue #06B1C4 ΔE 0.051
- Tea #65AB7C ΔE 0.054
- Dull Teal #5F9E8F ΔE 0.059
- Cadet Blue #5F9EA0 ΔE 0.061
- Green Blue #01C08D ΔE 0.061
Use #42B3A4 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.