#42BAFE
Closest named color: Deep Sky Blue (#00BFFF). oklch(75.2% 0.143 238.2), rgb(66, 186, 254).
Aa
Black text reads best on this color (9.68:1).
About this color
#42BAFE is a medium-light, vivid blue. In OKLCH its lightness is 75%, its chroma 0.143 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.020 away. Black text reads best on it, at 9.68:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.68:1 |
| White text | 2.16:1 |
Values
| HEX | #42BAFE |
| RGB | rgb(66, 186, 254) |
| HSL | hsl(202, 99%, 63%) |
| OKLCH | oklch(75.2% 0.143 238.2) |
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 #42BAFE | 2.16:1 | Fails | Lc -46.9 | Large or bold text, headings |
| Black text on #42BAFE | 9.68:1 | AAA | Lc 61.7 | Content text, not long reading |
| #42BAFE text on white | 2.16:1 | Fails | Lc 42.2 | Non-text elements, placeholder text |
| #42BAFE text on black | 9.68:1 | AAA | Lc -60.0 | 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
#EEF7FD
oklch(97.1% 0.013 236.6)
-
Step 100
100
#DBEDFA
oklch(93.7% 0.026 239.1)
-
Step 200
200
#BCDFF7
oklch(88.6% 0.05 238.1)
-
Step 300
300
#89C9F4
oklch(80.8% 0.089 238.7)
-
Step 400
400 (this color)
#42BAFE
oklch(75.2% 0.143 238.2)
-
Step 500
500
#0093D4
oklch(63% 0.141 238.5)
-
Step 600
600
#007CB3
oklch(55.7% 0.124 238.2)
-
Step 700
700
#006897
oklch(49.1% 0.109 238.1)
-
Step 800
800
#00557D
oklch(42.7% 0.096 238.5)
-
Step 900
900
#004769
oklch(37.8% 0.084 238.3)
-
Step 950
950
#002A40
oklch(27% 0.06 237.8)
#42BAFE 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) | #9ABAFF | 0.079 |
| Deuteranopia (no green cones) | #80A8FD | 0.064 |
| Tritanopia (no blue cones) | #00CBD1 | 0.094 |
| Achromatopsia (no color) | #B0B0B0 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42BAFE
#42BAFE
oklch(75.2% 0.143 238.2)
- #F19548
#F19548
oklch(75.1% 0.143 57.8)
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 #42BAFE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.020
- Bright Sky Blue #02CCFE ΔE 0.049
- Vivid Sky Blue #4CC9F0 ΔE 0.052
- Carolina Blue #8AB8FE ΔE 0.060
- Lightblue #7BC8F6 ΔE 0.064
- Sky #82CAFC ΔE 0.072
- Light Sky Blue #87CEFA ΔE 0.084
- Turquoise Blue #06B1C4 ΔE 0.091
Use #42BAFE 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.