#42BFB3
Closest named color: Topaz (#13BBAF). oklch(73.3% 0.11 186), rgb(66, 191, 179).
Aa
Black text reads best on this color (9.33:1).
About this color
#42BFB3 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.110 and its hue 186°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.023 away. Black text reads best on it, at 9.33:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.33:1 |
| White text | 2.24:1 |
Values
| HEX | #42BFB3 |
| RGB | rgb(66, 191, 179) |
| HSL | hsl(174, 49%, 50%) |
| OKLCH | oklch(73.3% 0.11 186) |
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 #42BFB3 | 2.24:1 | Fails | Lc -48.8 | Large or bold text, headings |
| Black text on #42BFB3 | 9.33:1 | AAA | Lc 60.0 | Large or bold text, headings |
| #42BFB3 text on white | 2.24:1 | Fails | Lc 44.0 | Non-text elements, placeholder text |
| #42BFB3 text on black | 9.33:1 | AAA | Lc -58.1 | 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
#DCEEEC
oklch(93.5% 0.019 188.8)
-
Step 200
200
#BEE2DD
oklch(88.5% 0.038 186.3)
-
Step 300
300
#8DD0C7
oklch(81% 0.069 185.4)
-
Step 400
400 (this color)
#42BFB3
oklch(73.3% 0.11 186)
-
Step 500
500
#009F93
oklch(63.2% 0.111 185.4)
-
Step 600
600
#00857C
oklch(55.5% 0.097 186.5)
-
Step 700
700
#007068
oklch(49.1% 0.086 186.2)
-
Step 800
800
#005C55
oklch(42.7% 0.075 185.9)
-
Step 900
900
#004D47
oklch(37.8% 0.066 185.9)
-
Step 950
950
#002E2A
oklch(27.1% 0.048 185.8)
#42BFB3 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) | #B5B5B3 | 0.116 |
| Deuteranopia (no green cones) | #A3A7B4 | 0.110 |
| Tritanopia (no blue cones) | #00C3BB | 0.019 |
| Achromatopsia (no color) | #ADADAD | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42BFB3
#42BFB3
oklch(73.3% 0.11 186)
- #E38B9E
#E38B9E
oklch(73.3% 0.109 6.1)
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 #42BFB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.023
- Light Sea Green #20B2AA ΔE 0.043
- Greeny Blue #42B395 ΔE 0.047
- Dark Turquoise #00CED1 ΔE 0.049
- Medium Aquamarine #66CDAA ΔE 0.054
- Medium Turquoise #48D1CC ΔE 0.055
- Turquoise Blue #06B1C4 ΔE 0.059
- Green Blue #01C08D ΔE 0.062
Use #42BFB3 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.