#428EA4
Closest named color: Blue NCS (#118AB2). oklch(60.8% 0.082 219.5), rgb(66, 142, 164).
Aa
Black text reads best on this color (5.63:1).
About this color
#428EA4 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 61%, its chroma 0.082 and its hue 220°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.037 away. Black text reads best on it, at 5.63:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.63:1 |
| White text | 3.72:1 |
Values
| HEX | #428EA4 |
| RGB | rgb(66, 142, 164) |
| HSL | hsl(193, 43%, 45%) |
| OKLCH | oklch(60.8% 0.082 219.5) |
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 #428EA4 | 3.72:1 | AA large text | Lc -70.1 | Content text, not long reading |
| Black text on #428EA4 | 5.63:1 | AA | Lc 39.5 | Non-text elements, placeholder text |
| #428EA4 text on white | 3.72:1 | AA large text | Lc 64.6 | Content text, not long reading |
| #428EA4 text on black | 5.63:1 | AA | Lc -37.0 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECEF
oklch(93.6% 0.011 217.5)
-
Step 200
200
#CADDE3
oklch(88.5% 0.022 218.6)
-
Step 300
300
#A5C7D2
oklch(80.8% 0.04 219.4)
-
Step 400
400
#72AABC
oklch(70.6% 0.064 220.1)
-
Step 500
500 (this color)
#428EA4
oklch(60.8% 0.082 219.5)
-
Step 600
600
#267F97
oklch(55.6% 0.089 219.9)
-
Step 700
700
#166B81
oklch(49% 0.083 220.2)
-
Step 800
800
#175869
oklch(42.9% 0.069 219.4)
-
Step 900
900
#1B4855
oklch(37.7% 0.053 219.9)
-
Step 950
950
#112A32
oklch(26.9% 0.034 221.3)
#428EA4 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) | #808AA5 | 0.069 |
| Deuteranopia (no green cones) | #7280A4 | 0.062 |
| Tritanopia (no blue cones) | #009595 | 0.045 |
| Achromatopsia (no color) | #848484 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #428EA4
#428EA4
oklch(60.8% 0.082 219.5)
- #AD715D
#AD715D
oklch(60.7% 0.082 39.2)
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 #428EA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.037
- Dusty Blue #5A86AD ΔE 0.037
- Teal Blue #01889F ΔE 0.037
- Teal Green #0A9396 ΔE 0.040
- Off Blue #5684AE ΔE 0.040
- Steel Blue #4682B4 ΔE 0.049
- Cool Blue #4984B8 ΔE 0.049
- Sea #3C9992 ΔE 0.050
Use #428EA4 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.