#42B1FA
Closest named color: Deep Sky Blue (#00BFFF). oklch(73% 0.145 241.8), rgb(66, 177, 250).
Aa
Black text reads best on this color (8.90:1).
About this color
#42B1FA is a medium-light, vivid blue. In OKLCH its lightness is 73%, its chroma 0.145 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.038 away. Black text reads best on it, at 8.90:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.90:1 |
| White text | 2.35:1 |
Values
| HEX | #42B1FA |
| RGB | rgb(66, 177, 250) |
| HSL | hsl(204, 95%, 62%) |
| OKLCH | oklch(73% 0.145 241.8) |
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 #42B1FA | 2.35:1 | Fails | Lc -51.1 | Large or bold text, headings |
| Black text on #42B1FA | 8.90:1 | AAA | Lc 57.8 | Large or bold text, headings |
| #42B1FA text on white | 2.35:1 | Fails | Lc 46.1 | Large or bold text, headings |
| #42B1FA text on black | 8.90:1 | AAA | Lc -55.9 | 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
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DBEDFA
oklch(93.7% 0.026 239.1)
-
Step 200
200
#BDDEF8
oklch(88.5% 0.05 241.9)
-
Step 300
300
#8BC8F6
oklch(80.8% 0.091 241.8)
-
Step 400
400 (this color)
#42B1FA
oklch(73% 0.145 241.8)
-
Step 500
500
#0092DB
oklch(63.2% 0.149 241.7)
-
Step 600
600
#007AB9
oklch(55.5% 0.132 242.1)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#002943
oklch(27% 0.065 242.6)
#42B1FA 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) | #8FB2FD | 0.070 |
| Deuteranopia (no green cones) | #76A1F9 | 0.055 |
| Tritanopia (no blue cones) | #00C3CB | 0.099 |
| Achromatopsia (no color) | #A9A9A9 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42B1FA
#42B1FA
oklch(73% 0.145 241.8)
- #E79038
#E79038
oklch(72.9% 0.145 61.8)
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 #42B1FA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.038
- Carolina Blue #8AB8FE ΔE 0.069
- Bright Sky Blue #02CCFE ΔE 0.072
- Vivid Sky Blue #4CC9F0 ΔE 0.073
- Cornflower Blue #6495ED ΔE 0.073
- Chefchaouen Blue #4895EF ΔE 0.074
- Lightblue #7BC8F6 ΔE 0.084
- Turquoise Blue #06B1C4 ΔE 0.087
Use #42B1FA 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.