#42A4E8
Closest named color: Chefchaouen Blue (#4895EF). oklch(69.1% 0.135 242.8), rgb(66, 164, 232).
Aa
Black text reads best on this color (7.70:1).
About this color
#42A4E8 is a medium-light, moderately saturated blue. In OKLCH its lightness is 69%, its chroma 0.135 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.044 away. Black text reads best on it, at 7.70:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.70:1 |
| White text | 2.72:1 |
Values
| HEX | #42A4E8 |
| RGB | rgb(66, 164, 232) |
| HSL | hsl(205, 78%, 58%) |
| OKLCH | oklch(69.1% 0.135 242.8) |
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 #42A4E8 | 2.72:1 | Fails | Lc -57.6 | Large or bold text, headings |
| Black text on #42A4E8 | 7.70:1 | AAA | Lc 51.6 | Large or bold text, headings |
| #42A4E8 text on white | 2.72:1 | Fails | Lc 52.4 | Large or bold text, headings |
| #42A4E8 text on black | 7.70:1 | AAA | Lc -49.4 | 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
#DCECF9
oklch(93.5% 0.025 242.3)
-
Step 200
200
#BFDEF6
oklch(88.6% 0.047 241.4)
-
Step 300
300
#90C8F3
oklch(81% 0.084 242.1)
-
Step 400
400 (this color)
#42A4E8
oklch(69.1% 0.135 242.8)
-
Step 500
500
#0091DD
oklch(63.1% 0.152 242.9)
-
Step 600
600
#007ABA
oklch(55.6% 0.133 242.5)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005482
oklch(42.8% 0.102 242.4)
-
Step 900
900
#00466D
oklch(37.8% 0.09 242.2)
-
Step 950
950
#002943
oklch(27% 0.065 242.6)
#42A4E8 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) | #85A5EB | 0.064 |
| Deuteranopia (no green cones) | #6E96E7 | 0.049 |
| Tritanopia (no blue cones) | #00B5BC | 0.095 |
| Achromatopsia (no color) | #9D9D9D | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42A4E8
#42A4E8
oklch(69.1% 0.135 242.8)
- #D68735
#D68735
oklch(69.2% 0.135 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 #42A4E8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.044
- Cornflower Blue #6495ED ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.059
- Deep Sky Blue #00BFFF ΔE 0.072
- Dodger Blue #1E90FF ΔE 0.074
- Turquoise Blue #06B1C4 ΔE 0.077
- Soft Blue #6488EA ΔE 0.077
- Faded Blue #658CBB ΔE 0.082
Use #42A4E8 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.