#42BBB3
Closest named color: Topaz (#13BBAF). oklch(72.4% 0.106 188.8), rgb(66, 187, 179).
Aa
Black text reads best on this color (8.99:1).
About this color
#42BBB3 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.106 and its hue 189°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.019 away. Black text reads best on it, at 8.99:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 8.99:1 |
| White text | 2.33:1 |
Values
| HEX | #42BBB3 |
| RGB | rgb(66, 187, 179) |
| HSL | hsl(176, 48%, 50%) |
| OKLCH | oklch(72.4% 0.106 188.8) |
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 #42BBB3 | 2.33:1 | Fails | Lc -50.6 | Large or bold text, headings |
| Black text on #42BBB3 | 8.99:1 | AAA | Lc 58.2 | Large or bold text, headings |
| #42BBB3 text on white | 2.33:1 | Fails | Lc 45.7 | Large or bold text, headings |
| #42BBB3 text on black | 8.99:1 | AAA | Lc -56.3 | 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 400.
-
Step 50
50
#EFF7F6
oklch(97% 0.009 188.1)
-
Step 100
100
#DCEEEC
oklch(93.5% 0.019 188.8)
-
Step 200
200
#BFE1DE
oklch(88.4% 0.036 190)
-
Step 300
300
#8ECFC9
oklch(80.9% 0.067 188.7)
-
Step 400
400 (this color)
#42BBB3
oklch(72.4% 0.106 188.8)
-
Step 500
500
#009E97
oklch(63.1% 0.109 189.2)
-
Step 600
600
#00857F
oklch(55.6% 0.096 189.2)
-
Step 700
700
#00706A
oklch(49.1% 0.085 188.3)
-
Step 800
800
#005C57
oklch(42.8% 0.074 188.4)
-
Step 900
900
#004C48
oklch(37.6% 0.065 188.7)
-
Step 950
950
#002E2B
oklch(27.1% 0.047 188)
#42BBB3 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) | #B1B1B3 | 0.113 |
| Deuteranopia (no green cones) | #9FA4B4 | 0.106 |
| Tritanopia (no blue cones) | #00C0B8 | 0.020 |
| Achromatopsia (no color) | #AAAAAA | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42BBB3
#42BBB3
oklch(72.4% 0.106 188.8)
- #DF8998
#DF8998
oklch(72.4% 0.106 8.8)
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 #42BBB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.019
- Light Sea Green #20B2AA ΔE 0.033
- Greeny Blue #42B395 ΔE 0.043
- Turquoise Blue #06B1C4 ΔE 0.049
- Dark Turquoise #00CED1 ΔE 0.057
- Medium Turquoise #48D1CC ΔE 0.064
- Medium Aquamarine #66CDAA ΔE 0.065
- Green Blue #01C08D ΔE 0.067
Use #42BBB3 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.