#4F73AB
Closest named color: Flat Blue (#3C73A8). oklch(55.3% 0.097 259), rgb(79, 115, 171).
Aa
White text reads best on this color (4.80:1).
About this color
#4F73AB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.097 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.020 away. White text reads best on it, at 4.80:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.37:1 |
| White text | 4.80:1 |
Values
| HEX | #4F73AB |
| RGB | rgb(79, 115, 171) |
| HSL | hsl(217, 37%, 49%) |
| OKLCH | oklch(55.3% 0.097 259) |
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 #4F73AB | 4.80:1 | AA | Lc -78.6 | Fine for body text |
| Black text on #4F73AB | 4.37:1 | AA large text | Lc 30.9 | Non-text elements, placeholder text |
| #4F73AB text on white | 4.80:1 | AA | Lc 73.2 | Content text, not long reading |
| #4F73AB text on black | 4.37:1 | AA large text | Lc -28.5 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D0DAEA
oklch(88.6% 0.025 259.8)
-
Step 300
300
#B0C2DD
oklch(80.9% 0.043 258.4)
-
Step 400
400
#86A2CD
oklch(70.7% 0.071 258.8)
-
Step 500
500
#688BBF
oklch(63.2% 0.088 258.1)
-
Step 600
600 (this color)
#4F73AB
oklch(55.3% 0.097 259)
-
Step 700
700
#406194
oklch(49.1% 0.091 258.8)
-
Step 800
800
#354F78
oklch(42.6% 0.076 259.2)
-
Step 900
900
#2E4260
oklch(37.6% 0.058 258.3)
-
Step 950
950
#1B2738
oklch(27% 0.036 257.1)
#4F73AB 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) | #5D77AD | 0.022 |
| Deuteranopia (no green cones) | #526EAA | 0.014 |
| Tritanopia (no blue cones) | #1D7F87 | 0.086 |
| Achromatopsia (no color) | #727272 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F73AB
#4F73AB
oklch(55.3% 0.097 259)
- #916B26
#916B26
oklch(55.3% 0.097 78.9)
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 #4F73AB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.020
- Dull Blue #49759C ΔE 0.027
- French Blue #436BAD ΔE 0.029
- Muted Blue #3B719F ΔE 0.030
- Windows Blue #3778BF ΔE 0.036
- Cerulean #457B9D ΔE 0.037
- Stormy Blue #507B9C ΔE 0.038
- Steel Blue #4682B4 ΔE 0.041
Use #4F73AB 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.