#42BFAA
Closest named color: Topaz (#13BBAF). oklch(73.1% 0.113 179.6), rgb(66, 191, 170).
Aa
Black text reads best on this color (9.26:1).
About this color
#42BFAA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.113 and its hue 180°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.024 away. Black text reads best on it, at 9.26:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.26:1 |
| White text | 2.26:1 |
Values
| HEX | #42BFAA |
| RGB | rgb(66, 191, 170) |
| HSL | hsl(170, 49%, 50%) |
| OKLCH | oklch(73.1% 0.113 179.6) |
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 #42BFAA | 2.26:1 | Fails | Lc -49.2 | Large or bold text, headings |
| Black text on #42BFAA | 9.26:1 | AAA | Lc 59.6 | Large or bold text, headings |
| #42BFAA text on white | 2.26:1 | Fails | Lc 44.4 | Non-text elements, placeholder text |
| #42BFAA text on black | 9.26:1 | AAA | Lc -57.8 | 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
#EFF8F5
oklch(97.2% 0.01 174.3)
-
Step 100
100
#DCEFEA
oklch(93.7% 0.021 178.3)
-
Step 200
200
#BEE2DA
oklch(88.5% 0.039 180.4)
-
Step 300
300
#8DD0C2
oklch(80.9% 0.071 179.9)
-
Step 400
400 (this color)
#42BFAA
oklch(73.1% 0.113 179.6)
-
Step 500
500
#00A08C
oklch(63.2% 0.115 179.7)
-
Step 600
600
#008675
oklch(55.5% 0.101 179.7)
-
Step 700
700
#007162
oklch(49.1% 0.09 179.3)
-
Step 800
800
#005D50
oklch(42.8% 0.078 178.9)
-
Step 900
900
#004D43
oklch(37.7% 0.068 180.3)
-
Step 950
950
#002E27
oklch(27% 0.049 179.5)
#42BFAA 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) | #B7B4A9 | 0.120 |
| Deuteranopia (no green cones) | #A5A7AC | 0.114 |
| Tritanopia (no blue cones) | #00C2B9 | 0.024 |
| Achromatopsia (no color) | #ACACAC | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42BFAA
#42BFAA
oklch(73.1% 0.113 179.6)
- #E289A5
#E289A5
oklch(73.1% 0.113 0)
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 #42BFAA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.024
- Greeny Blue #42B395 ΔE 0.039
- Light Sea Green #20B2AA ΔE 0.044
- Green Blue #01C08D ΔE 0.050
- Medium Aquamarine #66CDAA ΔE 0.051
- Greenblue #23C48B ΔE 0.054
- Dark Turquoise #00CED1 ΔE 0.058
- Medium Turquoise #48D1CC ΔE 0.061
Use #42BFAA 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.