#4178AF
Closest named color: Flat Blue (#3C73A8). oklch(56% 0.104 250.2), rgb(65, 120, 175).
Aa
White text reads best on this color (4.63:1).
About this color
#4178AF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.104 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.018 away. White text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.53:1 |
| White text | 4.63:1 |
Values
| HEX | #4178AF |
| RGB | rgb(65, 120, 175) |
| HSL | hsl(210, 46%, 47%) |
| OKLCH | oklch(56% 0.104 250.2) |
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 #4178AF | 4.63:1 | AA | Lc -77.5 | Fine for body text |
| Black text on #4178AF | 4.53:1 | AA | Lc 32.1 | Non-text elements, placeholder text |
| #4178AF text on white | 4.63:1 | AA | Lc 72.0 | Content text, not long reading |
| #4178AF text on black | 4.53:1 | AA | Lc -29.7 | Dividers and decoration only |
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
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CDDBEA
oklch(88.5% 0.026 250)
-
Step 300
300
#ABC4DE
oklch(81% 0.046 249.4)
-
Step 400
400
#7DA5CE
oklch(70.8% 0.074 249.5)
-
Step 500
500
#5B8DC1
oklch(63% 0.096 250.5)
-
Step 600
600 (this color)
#4178AF
oklch(56% 0.104 250.2)
-
Step 700
700
#316495
oklch(49.1% 0.096 249.6)
-
Step 800
800
#2A5179
oklch(42.6% 0.08 250.8)
-
Step 900
900
#264461
oklch(37.7% 0.062 249)
-
Step 950
950
#172839
oklch(27.1% 0.039 249.5)
#4178AF 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) | #607AB1 | 0.036 |
| Deuteranopia (no green cones) | #5270AE | 0.026 |
| Tritanopia (no blue cones) | #00858C | 0.083 |
| Achromatopsia (no color) | #757575 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4178AF
#4178AF
oklch(56% 0.104 250.2)
- #9B6825
#9B6825
oklch(55.9% 0.104 69.6)
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 #4178AF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.018
- Windows Blue #3778BF ΔE 0.026
- Nice Blue #107AB0 ΔE 0.028
- Dull Blue #49759C ΔE 0.029
- Steel Blue #4682B4 ΔE 0.030
- Muted Blue #3B719F ΔE 0.031
- Cerulean #457B9D ΔE 0.032
- Stormy Blue #507B9C ΔE 0.036
Use #4178AF 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.