#478CBB
Closest named color: Cool Blue (#4984B8). oklch(61.5% 0.1 240.8), rgb(71, 140, 187).
Aa
Black text reads best on this color (5.73:1).
About this color
#478CBB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.100 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.022 away. Black text reads best on it, at 5.73:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.73:1 |
| White text | 3.66:1 |
Values
| HEX | #478CBB |
| RGB | rgb(71, 140, 187) |
| HSL | hsl(204, 46%, 51%) |
| OKLCH | oklch(61.5% 0.1 240.8) |
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 #478CBB | 3.66:1 | AA large text | Lc -69.5 | Content text, not long reading |
| Black text on #478CBB | 5.73:1 | AA | Lc 40.1 | Non-text elements, placeholder text |
| #478CBB text on white | 3.66:1 | AA large text | Lc 64.0 | Content text, not long reading |
| #478CBB text on black | 5.73:1 | AA | Lc -37.7 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEA
oklch(88.5% 0.027 241.2)
-
Step 300
300
#A5C5DE
oklch(80.8% 0.049 241.8)
-
Step 400
400
#73A7CD
oklch(70.6% 0.078 241)
-
Step 500
500 (this color)
#478CBB
oklch(61.5% 0.1 240.8)
-
Step 600
600
#2B7AAC
oklch(55.5% 0.108 240.8)
-
Step 700
700
#1C6794
oklch(49.1% 0.101 240.5)
-
Step 800
800
#1B5478
oklch(42.7% 0.083 240.8)
-
Step 900
900
#1D4661
oklch(37.8% 0.065 240.4)
-
Step 950
950
#122939
oklch(27% 0.042 241)
#478CBB 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) | #778CBD | 0.053 |
| Deuteranopia (no green cones) | #6780BA | 0.044 |
| Tritanopia (no blue cones) | #00989C | 0.075 |
| Achromatopsia (no color) | #868686 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #478CBB
#478CBB
oklch(61.5% 0.1 240.8)
- #B07642
#B07642
oklch(61.5% 0.1 61.1)
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 #478CBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.022
- Dusty Blue #5A86AD ΔE 0.027
- Off Blue #5684AE ΔE 0.027
- Steel Blue #4682B4 ΔE 0.029
- Faded Blue #658CBB ΔE 0.030
- Blue NCS #118AB2 ΔE 0.035
- Water Blue #0E87CC ΔE 0.044
- Silver Lake Blue #778DA9 ΔE 0.057
Use #478CBB 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.