#42AED9
Closest named color: Turquoise Blue (#06B1C4). oklch(70.7% 0.115 228.3), rgb(66, 174, 217).
Aa
Black text reads best on this color (8.28:1).
About this color
#42AED9 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 71%, its chroma 0.115 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.042 away. Black text reads best on it, at 8.28:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.28:1 |
| White text | 2.53:1 |
Values
| HEX | #42AED9 |
| RGB | rgb(66, 174, 217) |
| HSL | hsl(197, 67%, 55%) |
| OKLCH | oklch(70.7% 0.115 228.3) |
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 #42AED9 | 2.53:1 | Fails | Lc -54.4 | Large or bold text, headings |
| Black text on #42AED9 | 8.28:1 | AAA | Lc 54.7 | Large or bold text, headings |
| #42AED9 text on white | 2.53:1 | Fails | Lc 49.3 | Large or bold text, headings |
| #42AED9 text on black | 8.28:1 | AAA | Lc -52.6 | 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
#EFF7FB
oklch(97.1% 0.01 228.9)
-
Step 100
100
#DCEDF5
oklch(93.6% 0.021 227.5)
-
Step 200
200
#BFDFEE
oklch(88.5% 0.04 227.8)
-
Step 300
300
#8FCAE6
oklch(80.8% 0.072 229.1)
-
Step 400
400 (this color)
#42AED9
oklch(70.7% 0.115 228.3)
-
Step 500
500
#0097C4
oklch(63.2% 0.123 228.1)
-
Step 600
600
#007FA5
oklch(55.7% 0.108 227.8)
-
Step 700
700
#006A8B
oklch(49% 0.096 228.3)
-
Step 800
800
#005773
oklch(42.7% 0.084 228.5)
-
Step 900
900
#004960
oklch(37.8% 0.073 227.3)
-
Step 950
950
#002B3B
oklch(27% 0.053 228.8)
#42AED9 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) | #97ABDB | 0.082 |
| Deuteranopia (no green cones) | #839CD8 | 0.072 |
| Tritanopia (no blue cones) | #00BABC | 0.066 |
| Achromatopsia (no color) | #A3A3A3 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42AED9
#42AED9
oklch(70.7% 0.115 228.3)
- #DA8A5E
#DA8A5E
oklch(70.7% 0.114 49)
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 #42AED9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.042
- Deep Sky Blue #00BFFF ΔE 0.062
- Greyblue #77A1B5 ΔE 0.064
- Bluegrey #85A3B2 ΔE 0.076
- Vivid Sky Blue #4CC9F0 ΔE 0.077
- Light Sea Green #20B2AA ΔE 0.079
- Bluey Grey #89A0B0 ΔE 0.082
- Cadet Blue #5F9EA0 ΔE 0.083
Use #42AED9 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.