#428BCD
Closest named color: Water Blue (#0E87CC). oklch(62% 0.124 248.4), rgb(66, 139, 205).
Aa
Black text reads best on this color (5.80:1).
About this color
#428BCD is a medium-light, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.124 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.030 away. Black text reads best on it, at 5.80:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.80:1 |
| White text | 3.61:1 |
Values
| HEX | #428BCD |
| RGB | rgb(66, 139, 205) |
| HSL | hsl(208, 58%, 53%) |
| OKLCH | oklch(62% 0.124 248.4) |
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 #428BCD | 3.61:1 | AA large text | Lc -69.0 | Content text, not long reading |
| Black text on #428BCD | 5.80:1 | AA | Lc 40.6 | Non-text elements, placeholder text |
| #428BCD text on white | 3.61:1 | AA large text | Lc 63.5 | Content text, not long reading |
| #428BCD text on black | 5.80:1 | AA | Lc -38.2 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEF
oklch(88.5% 0.034 246.8)
-
Step 300
300
#A3C5E7
oklch(81% 0.061 248.6)
-
Step 400
400
#6FA6DB
oklch(70.8% 0.097 248.5)
-
Step 500
500 (this color)
#428BCD
oklch(62% 0.124 248.4)
-
Step 600
600
#2177BE
oklch(55.6% 0.135 248.6)
-
Step 700
700
#1264A4
oklch(49.2% 0.126 248.5)
-
Step 800
800
#145285
oklch(42.8% 0.104 248.5)
-
Step 900
900
#19446A
oklch(37.7% 0.081 248.4)
-
Step 950
950
#10283E
oklch(27% 0.051 248.4)
#428BCD 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) | #6E8ED0 | 0.047 |
| Deuteranopia (no green cones) | #5A81CC | 0.032 |
| Tritanopia (no blue cones) | #009BA3 | 0.094 |
| Achromatopsia (no color) | #868686 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428BCD
#428BCD
oklch(62% 0.124 248.4)
- #B67621
#B67621
oklch(62% 0.124 68.3)
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 #428BCD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.030
- Cool Blue #4984B8 ΔE 0.033
- Dark Sky Blue #448EE4 ΔE 0.035
- Steel Blue #4682B4 ΔE 0.041
- Faded Blue #658CBB ΔE 0.043
- Off Blue #5684AE ΔE 0.048
- Dusty Blue #5A86AD ΔE 0.050
- Blue NCS #118AB2 ΔE 0.052
Use #428BCD 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.