#42BFA0
Closest named color: Topaz (#13BBAF). oklch(72.8% 0.119 173.1), rgb(66, 191, 160).
Aa
Black text reads best on this color (9.19:1).
About this color
#42BFA0 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.119 and its hue 173°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.032 away. Black text reads best on it, at 9.19:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.19:1 |
| White text | 2.28:1 |
Values
| HEX | #42BFA0 |
| RGB | rgb(66, 191, 160) |
| HSL | hsl(165, 49%, 50%) |
| OKLCH | oklch(72.8% 0.119 173.1) |
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 #42BFA0 | 2.28:1 | Fails | Lc -49.6 | Large or bold text, headings |
| Black text on #42BFA0 | 9.19:1 | AAA | Lc 59.3 | Large or bold text, headings |
| #42BFA0 text on white | 2.28:1 | Fails | Lc 44.7 | Non-text elements, placeholder text |
| #42BFA0 text on black | 9.19:1 | AAA | Lc -57.4 | 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
#DCEFE8
oklch(93.6% 0.022 171.8)
-
Step 200
200
#BEE3D6
oklch(88.6% 0.043 172)
-
Step 300
300
#8ED1BC
oklch(81% 0.074 172.8)
-
Step 400
400 (this color)
#42BFA0
oklch(72.8% 0.119 173.1)
-
Step 500
500
#00A183
oklch(63.2% 0.121 173.2)
-
Step 600
600
#00876D
oklch(55.6% 0.107 172.9)
-
Step 700
700
#00725C
oklch(49.2% 0.094 173.1)
-
Step 800
800
#005D4B
oklch(42.7% 0.081 173.5)
-
Step 900
900
#004E3E
oklch(37.8% 0.073 172.9)
-
Step 950
950
#002E24
oklch(26.9% 0.051 173.7)
#42BFA0 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) | #B9B39F | 0.123 |
| Deuteranopia (no green cones) | #A7A6A2 | 0.118 |
| Tritanopia (no blue cones) | #00C1B6 | 0.032 |
| Achromatopsia (no color) | #ABABAB | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42BFA0
#42BFA0
oklch(72.8% 0.119 173.1)
- #E087AD
#E087AD
oklch(72.8% 0.118 353.3)
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 #42BFA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.032
- Greeny Blue #42B395 ΔE 0.034
- Green Blue #01C08D ΔE 0.037
- Greenblue #23C48B ΔE 0.040
- Light Sea Green #20B2AA ΔE 0.049
- Medium Aquamarine #66CDAA ΔE 0.051
- Dark Seafoam #1FB57A ΔE 0.059
- Tea #65AB7C ΔE 0.062
Use #42BFA0 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.