#428DE7
Closest named color: Dark Sky Blue (#448EE4). oklch(63.9% 0.155 254.7), rgb(66, 141, 231).
Aa
Black text reads best on this color (6.19:1).
About this color
#428DE7 is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.155 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.006 away. Black text reads best on it, at 6.19:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.19:1 |
| White text | 3.38:1 |
Values
| HEX | #428DE7 |
| RGB | rgb(66, 141, 231) |
| HSL | hsl(213, 77%, 58%) |
| OKLCH | oklch(63.9% 0.155 254.7) |
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 #428DE7 | 3.38:1 | AA large text | Lc -66.5 | Content text, not long reading |
| Black text on #428DE7 | 6.19:1 | AA | Lc 43.0 | Non-text elements, placeholder text |
| #428DE7 text on white | 3.38:1 | AA large text | Lc 61.0 | Content text, not long reading |
| #428DE7 text on black | 6.19:1 | AA | Lc -40.7 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#A0C4F1
oklch(81% 0.075 254.2)
-
Step 400
400
#6AA3EA
oklch(70.6% 0.121 254.6)
-
Step 500
500 (this color)
#428DE7
oklch(63.9% 0.155 254.7)
-
Step 600
600
#1972D2
oklch(55.6% 0.168 254.8)
-
Step 700
700
#075FB6
oklch(49.1% 0.156 254.7)
-
Step 800
800
#0D4E93
oklch(42.6% 0.129 254.6)
-
Step 900
900
#154275
oklch(37.8% 0.1 254.2)
-
Step 950
950
#0E2745
oklch(27.1% 0.064 254.6)
#428DE7 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) | #6394EB | 0.038 |
| Deuteranopia (no green cones) | #4984E5 | 0.023 |
| Tritanopia (no blue cones) | #00A2AF | 0.119 |
| Achromatopsia (no color) | #8B8B8B | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428DE7
#428DE7
oklch(63.9% 0.155 254.7)
- #BB7E00
#BB7E00
oklch(64% 0.135 75)
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 #428DE7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.006
- Chefchaouen Blue #4895EF ΔE 0.024
- Soft Blue #6488EA ΔE 0.033
- Dodger Blue #1E90FF ΔE 0.038
- Cornflower Blue #6495ED ΔE 0.041
- Water Blue #0E87CC ΔE 0.053
- Clear Blue #247AFD ΔE 0.068
- Cornflower #6A79F7 ΔE 0.068
Use #428DE7 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.