#428ABA
Closest named color: Cool Blue (#4984B8). oklch(60.8% 0.103 240.6), rgb(66, 138, 186).
Aa
Black text reads best on this color (5.57:1).
About this color
#428ABA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.103 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.017 away. Black text reads best on it, at 5.57:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.57:1 |
| White text | 3.76:1 |
Values
| HEX | #428ABA |
| RGB | rgb(66, 138, 186) |
| HSL | hsl(204, 48%, 49%) |
| OKLCH | oklch(60.8% 0.103 240.6) |
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 #428ABA | 3.76:1 | AA large text | Lc -70.5 | Content text, not long reading |
| Black text on #428ABA | 5.57:1 | AA | Lc 39.1 | Non-text elements, placeholder text |
| #428ABA text on white | 3.76:1 | AA large text | Lc 65.0 | Content text, not long reading |
| #428ABA text on black | 5.57:1 | AA | Lc -36.7 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#C9DCEA
oklch(88.5% 0.028 239.7)
-
Step 300
300
#A4C6DE
oklch(81% 0.05 239)
-
Step 400
400
#72A7CE
oklch(70.6% 0.08 241.2)
-
Step 500
500 (this color)
#428ABA
oklch(60.8% 0.103 240.6)
-
Step 600
600
#277AAE
oklch(55.5% 0.112 241.1)
-
Step 700
700
#186795
oklch(49.1% 0.103 240.4)
-
Step 800
800
#185479
oklch(42.7% 0.086 240.7)
-
Step 900
900
#1B4662
oklch(37.8% 0.067 240.5)
-
Step 950
950
#112939
oklch(27% 0.042 240.1)
#428ABA 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) | #748ABC | 0.053 |
| Deuteranopia (no green cones) | #647EB9 | 0.044 |
| Tritanopia (no blue cones) | #00969A | 0.075 |
| Achromatopsia (no color) | #838383 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428ABA
#428ABA
oklch(60.8% 0.103 240.6)
- #AF733E
#AF733E
oklch(60.8% 0.102 60.4)
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 #428ABA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.017
- Steel Blue #4682B4 ΔE 0.022
- Off Blue #5684AE ΔE 0.025
- Dusty Blue #5A86AD ΔE 0.027
- Blue NCS #118AB2 ΔE 0.030
- Faded Blue #658CBB ΔE 0.036
- Water Blue #0E87CC ΔE 0.039
- Stormy Blue #507B9C ΔE 0.054
Use #428ABA 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.