#42B59F
Closest named color: Greeny Blue (#42B395). oklch(70.2% 0.108 177.9), rgb(66, 181, 159).
Aa
Black text reads best on this color (8.34:1).
About this color
#42B59F is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 70%, its chroma 0.108 and its hue 178°. Its hue sits on the cool side of the wheel. The nearest named color is Greeny Blue (#42B395), ΔE 0.014 away. Black text reads best on it, at 8.34:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Greeny Blue (#42B395) |
| Black text | 8.34:1 |
| White text | 2.51:1 |
Values
| HEX | #42B59F |
| RGB | rgb(66, 181, 159) |
| HSL | hsl(169, 47%, 48%) |
| OKLCH | oklch(70.2% 0.108 177.9) |
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 #42B59F | 2.51:1 | Fails | Lc -54.1 | Large or bold text, headings |
| Black text on #42B59F | 8.34:1 | AAA | Lc 54.9 | Large or bold text, headings |
| #42B59F text on white | 2.51:1 | Fails | Lc 49.1 | Large or bold text, headings |
| #42B59F text on black | 8.34:1 | AAA | Lc -52.9 | 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
#EFF8F5
oklch(97.2% 0.01 174.3)
-
Step 100
100
#DDEEEA
oklch(93.5% 0.019 180.3)
-
Step 200
200
#C0E2D9
oklch(88.6% 0.038 177.6)
-
Step 300
300
#91CFC0
oklch(80.8% 0.067 177.8)
-
Step 400
400 (this color)
#42B59F
oklch(70.2% 0.108 177.9)
-
Step 500
500
#00A089
oklch(63.1% 0.116 177.6)
-
Step 600
600
#008673
oklch(55.5% 0.102 178.1)
-
Step 700
700
#007161
oklch(49.1% 0.09 178.4)
-
Step 800
800
#005D4F
oklch(42.8% 0.079 177.8)
-
Step 900
900
#004D41
oklch(37.6% 0.069 177.7)
-
Step 950
950
#002E26
oklch(26.9% 0.05 177.5)
#42B59F 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) | #AEAA9E | 0.114 |
| Deuteranopia (no green cones) | #9D9EA1 | 0.108 |
| Tritanopia (no blue cones) | #00B8AE | 0.025 |
| Achromatopsia (no color) | #A3A3A3 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42B59F
#42B59F
oklch(70.2% 0.108 177.9)
- #D5829F
#D5829F
oklch(70.2% 0.108 357.8)
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 #42B59F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Blue #42B395 ΔE 0.014
- Light Sea Green #20B2AA ΔE 0.025
- Topaz #13BBAF ΔE 0.026
- Tea #65AB7C ΔE 0.049
- Green Blue #01C08D ΔE 0.051
- Bluey Green #2BB179 ΔE 0.056
- Dark Seafoam Green #3EAF76 ΔE 0.056
- Dark Seafoam #1FB57A ΔE 0.058
Use #42B59F 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.