#42AFFA
Closest named color: Deep Sky Blue (#00BFFF). oklch(72.5% 0.146 242.9), rgb(66, 175, 250).
Aa
Black text reads best on this color (8.74:1).
About this color
#42AFFA is a medium-light, vivid blue. In OKLCH its lightness is 73%, its chroma 0.146 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.043 away. Black text reads best on it, at 8.74:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.74:1 |
| White text | 2.40:1 |
Values
| HEX | #42AFFA |
| RGB | rgb(66, 175, 250) |
| HSL | hsl(204, 95%, 62%) |
| OKLCH | oklch(72.5% 0.146 242.9) |
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 #42AFFA | 2.40:1 | Fails | Lc -51.9 | Large or bold text, headings |
| Black text on #42AFFA | 8.74:1 | AAA | Lc 57.1 | Large or bold text, headings |
| #42AFFA text on white | 2.40:1 | Fails | Lc 46.9 | Large or bold text, headings |
| #42AFFA text on black | 8.74:1 | AAA | Lc -55.1 | 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
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DBECFB
oklch(93.5% 0.027 244.7)
-
Step 200
200
#BDDEF9
oklch(88.5% 0.051 243)
-
Step 300
300
#8CC8F7
oklch(80.9% 0.091 242.8)
-
Step 400
400 (this color)
#42AFFA
oklch(72.5% 0.146 242.9)
-
Step 500
500
#0091DD
oklch(63.1% 0.152 242.9)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005482
oklch(42.8% 0.102 242.4)
-
Step 900
900
#00466E
oklch(37.8% 0.091 242.8)
-
Step 950
950
#002943
oklch(27% 0.065 242.6)
#42AFFA 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) | #8CB1FD | 0.068 |
| Deuteranopia (no green cones) | #739FF9 | 0.054 |
| Tritanopia (no blue cones) | #00C1C9 | 0.102 |
| Achromatopsia (no color) | #A7A7A7 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42AFFA
#42AFFA
oklch(72.5% 0.146 242.9)
- #E68F32
#E68F32
oklch(72.6% 0.147 62.7)
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 #42AFFA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.043
- Cornflower Blue #6495ED ΔE 0.068
- Chefchaouen Blue #4895EF ΔE 0.069
- Carolina Blue #8AB8FE ΔE 0.071
- Bright Sky Blue #02CCFE ΔE 0.077
- Vivid Sky Blue #4CC9F0 ΔE 0.078
- Periwinkle Blue #8F99FB ΔE 0.087
- Turquoise Blue #06B1C4 ΔE 0.088
Use #42AFFA 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.