#42BFAD
Closest named color: Topaz (#13BBAF). oklch(73.2% 0.112 181.7), rgb(66, 191, 173).
Aa
Black text reads best on this color (9.28:1).
About this color
#42BFAD is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.112 and its hue 182°. 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 9.28:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.28:1 |
| White text | 2.26:1 |
Values
| HEX | #42BFAD |
| RGB | rgb(66, 191, 173) |
| HSL | hsl(171, 49%, 50%) |
| OKLCH | oklch(73.2% 0.112 181.7) |
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 #42BFAD | 2.26:1 | Fails | Lc -49.1 | Large or bold text, headings |
| Black text on #42BFAD | 9.28:1 | AAA | Lc 59.7 | Large or bold text, headings |
| #42BFAD text on white | 2.26:1 | Fails | Lc 44.2 | Non-text elements, placeholder text |
| #42BFAD text on black | 9.28:1 | AAA | Lc -57.9 | 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
#DCEFEB
oklch(93.7% 0.021 181.9)
-
Step 200
200
#BEE2DB
oklch(88.5% 0.039 182.3)
-
Step 300
300
#8DD0C4
oklch(80.9% 0.07 182)
-
Step 400
400 (this color)
#42BFAD
oklch(73.2% 0.112 181.7)
-
Step 500
500
#009F8E
oklch(63% 0.113 181.8)
-
Step 600
600
#008677
oklch(55.6% 0.1 181.4)
-
Step 700
700
#007164
oklch(49.2% 0.089 181.2)
-
Step 800
800
#005C52
oklch(42.6% 0.076 182.2)
-
Step 900
900
#004D44
oklch(37.7% 0.068 181.7)
-
Step 950
950
#002E28
oklch(27% 0.049 181.5)
#42BFAD 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) | #B7B4AC | 0.119 |
| Deuteranopia (no green cones) | #A4A7AF | 0.112 |
| Tritanopia (no blue cones) | #00C2B9 | 0.021 |
| Achromatopsia (no color) | #ACACAC | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42BFAD
#42BFAD
oklch(73.2% 0.112 181.7)
- #E289A3
#E289A3
oklch(73% 0.112 1.4)
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 #42BFAD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.023
- Greeny Blue #42B395 ΔE 0.041
- Light Sea Green #20B2AA ΔE 0.043
- Medium Aquamarine #66CDAA ΔE 0.052
- Green Blue #01C08D ΔE 0.054
- Dark Turquoise #00CED1 ΔE 0.055
- Greenblue #23C48B ΔE 0.058
- Medium Turquoise #48D1CC ΔE 0.059
Use #42BFAD 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.