#428BC7
Closest named color: Cool Blue (#4984B8). oklch(61.7% 0.117 246.1), rgb(66, 139, 199).
Aa
Black text reads best on this color (5.74:1).
About this color
#428BC7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.117 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.026 away. Black text reads best on it, at 5.74:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.74:1 |
| White text | 3.65:1 |
Values
| HEX | #428BC7 |
| RGB | rgb(66, 139, 199) |
| HSL | hsl(207, 54%, 52%) |
| OKLCH | oklch(61.7% 0.117 246.1) |
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 #428BC7 | 3.65:1 | AA large text | Lc -69.4 | Content text, not long reading |
| Black text on #428BC7 | 5.74:1 | AA | Lc 40.2 | Non-text elements, placeholder text |
| #428BC7 text on white | 3.65:1 | AA large text | Lc 63.9 | Content text, not long reading |
| #428BC7 text on black | 5.74:1 | AA | Lc -37.8 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C9DCED
oklch(88.6% 0.031 245.1)
-
Step 300
300
#A3C5E4
oklch(80.9% 0.057 246.1)
-
Step 400
400
#70A6D6
oklch(70.6% 0.091 246.3)
-
Step 500
500 (this color)
#428BC7
oklch(61.7% 0.117 246.1)
-
Step 600
600
#2378B8
oklch(55.5% 0.127 246.2)
-
Step 700
700
#13659F
oklch(49.1% 0.118 246.1)
-
Step 800
800
#155381
oklch(42.8% 0.097 245.9)
-
Step 900
900
#194567
oklch(37.7% 0.076 245.2)
-
Step 950
950
#10283D
oklch(26.9% 0.05 247.3)
#428BC7 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) | #708DCA | 0.049 |
| Deuteranopia (no green cones) | #5E80C6 | 0.037 |
| Tritanopia (no blue cones) | #0099A0 | 0.087 |
| Achromatopsia (no color) | #868686 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428BC7
#428BC7
oklch(61.7% 0.117 246.1)
- #B4752D
#B4752D
oklch(61.6% 0.117 65.7)
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 #428BC7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.026
- Water Blue #0E87CC ΔE 0.031
- Steel Blue #4682B4 ΔE 0.034
- Faded Blue #658CBB ΔE 0.038
- Off Blue #5684AE ΔE 0.040
- Dusty Blue #5A86AD ΔE 0.042
- Dark Sky Blue #448EE4 ΔE 0.044
- Blue NCS #118AB2 ΔE 0.044
Use #428BC7 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.