#42A3B5
Closest named color: Cadet Blue (#5F9EA0). oklch(66.6% 0.093 211.9), rgb(66, 163, 181).
Aa
Black text reads best on this color (7.13:1).
About this color
#42A3B5 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 67%, its chroma 0.093 and its hue 212°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.034 away. Black text reads best on it, at 7.13:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 7.13:1 |
| White text | 2.94:1 |
Values
| HEX | #42A3B5 |
| RGB | rgb(66, 163, 181) |
| HSL | hsl(189, 47%, 48%) |
| OKLCH | oklch(66.6% 0.093 211.9) |
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 #42A3B5 | 2.94:1 | Fails | Lc -61.0 | Content text, not long reading |
| Black text on #42A3B5 | 7.13:1 | AAA | Lc 48.4 | Large or bold text, headings |
| #42A3B5 text on white | 2.94:1 | Fails | Lc 55.6 | Large or bold text, headings |
| #42A3B5 text on black | 7.13:1 | AAA | Lc -46.2 | 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 500.
-
Step 50
50
#F1F7F8
oklch(97.2% 0.007 208.8)
-
Step 100
100
#E0ECEF
oklch(93.5% 0.013 214.4)
-
Step 200
200
#C7DEE3
oklch(88.5% 0.025 212.2)
-
Step 300
300
#9FC9D2
oklch(80.9% 0.046 212.2)
-
Step 400
400
#68ADBB
oklch(70.7% 0.073 212)
-
Step 500
500 (this color)
#42A3B5
oklch(66.6% 0.093 211.9)
-
Step 600
600
#008294
oklch(55.7% 0.097 211.6)
-
Step 700
700
#006D7D
oklch(49.1% 0.086 212.3)
-
Step 800
800
#005967
oklch(42.6% 0.075 213)
-
Step 900
900
#0C4A54
oklch(37.7% 0.061 211.3)
-
Step 950
950
#0B2B31
oklch(26.9% 0.038 212.2)
#42A3B5 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) | #959EB6 | 0.087 |
| Deuteranopia (no green cones) | #8491B5 | 0.079 |
| Tritanopia (no blue cones) | #00ABA8 | 0.041 |
| Achromatopsia (no color) | #969696 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42A3B5
#42A3B5
oklch(66.6% 0.093 211.9)
- #C67E70
#C67E70
oklch(66.5% 0.093 31.6)
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 #42A3B5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.034
- Turquoise Blue #06B1C4 ΔE 0.040
- Greyblue #77A1B5 ΔE 0.048
- Light Sea Green #20B2AA ΔE 0.053
- Sea #3C9992 ΔE 0.054
- Dull Teal #5F9E8F ΔE 0.055
- Persian Green #2A9D8F ΔE 0.060
- Grey Teal #5E9B8A ΔE 0.061
Use #42A3B5 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.