#4978BD
Closest named color: Windows Blue (#3778BF). oklch(57.1% 0.119 257.9), rgb(73, 120, 189).
Aa
Black text reads best on this color (4.70:1).
About this color
#4978BD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.119 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.016 away. Black text reads best on it, at 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.70:1 |
| White text | 4.46:1 |
Values
| HEX | #4978BD |
| RGB | rgb(73, 120, 189) |
| HSL | hsl(216, 47%, 51%) |
| OKLCH | oklch(57.1% 0.119 257.9) |
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 #4978BD | 4.46:1 | AA large text | Lc -76.3 | Fine for body text |
| Black text on #4978BD | 4.70:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #4978BD text on white | 4.46:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #4978BD text on black | 4.70:1 | AA | Lc -30.9 | 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 600.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CDDAED
oklch(88.4% 0.03 257.8)
-
Step 300
300
#ACC2E4
oklch(80.9% 0.054 259)
-
Step 400
400
#7FA2D6
oklch(70.6% 0.086 258.1)
-
Step 500
500
#5F8ACB
oklch(63% 0.11 258.4)
-
Step 600
600 (this color)
#4978BD
oklch(57.1% 0.119 257.9)
-
Step 700
700
#36609E
oklch(49% 0.111 258.1)
-
Step 800
800
#2D4F80
oklch(42.7% 0.091 257.6)
-
Step 900
900
#294267
oklch(37.7% 0.071 258)
-
Step 950
950
#18273C
oklch(27% 0.044 256.9)
#4978BD 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) | #5B7DC0 | 0.026 |
| Deuteranopia (no green cones) | #4B72BC | 0.016 |
| Tritanopia (no blue cones) | #008891 | 0.102 |
| Achromatopsia (no color) | #777777 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4978BD
#4978BD
oklch(57.1% 0.119 257.9)
- #9E6D01
#9E6D01
oklch(57.1% 0.119 77.5)
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 #4978BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.016
- Steel Blue #4682B4 ΔE 0.035
- Cool Blue #4984B8 ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.038
- French Blue #436BAD ΔE 0.042
- Nice Blue #107AB0 ΔE 0.044
- Water Blue #0E87CC ΔE 0.049
- Off Blue #5684AE ΔE 0.049
Use #4978BD 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.