#4F81BB
Closest named color: Cool Blue (#4984B8). oklch(59.4% 0.105 253.2), rgb(79, 129, 187).
Aa
Black text reads best on this color (5.19:1).
About this color
#4F81BB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.105 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.012 away. Black text reads best on it, at 5.19:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.19:1 |
| White text | 4.04:1 |
Values
| HEX | #4F81BB |
| RGB | rgb(79, 129, 187) |
| HSL | hsl(212, 44%, 52%) |
| OKLCH | oklch(59.4% 0.105 253.2) |
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 #4F81BB | 4.04:1 | AA large text | Lc -73.0 | Content text, not long reading |
| Black text on #4F81BB | 5.19:1 | AA | Lc 36.5 | Non-text elements, placeholder text |
| #4F81BB text on white | 4.04:1 | AA large text | Lc 67.5 | Content text, not long reading |
| #4F81BB text on black | 5.19:1 | AA | Lc -34.1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CCDBEC
oklch(88.5% 0.029 251.5)
-
Step 300
300
#AAC3E2
oklch(80.9% 0.052 253.9)
-
Step 400
400
#7CA4D3
oklch(70.7% 0.082 252.9)
-
Step 500
500 (this color)
#4F81BB
oklch(59.4% 0.105 253.2)
-
Step 600
600
#3F76B4
oklch(55.7% 0.113 252.9)
-
Step 700
700
#31629B
oklch(49% 0.106 253.7)
-
Step 800
800
#29517E
oklch(42.8% 0.088 252.9)
-
Step 900
900
#264365
oklch(37.7% 0.068 253.4)
-
Step 950
950
#17273B
oklch(26.9% 0.043 254.6)
#4F81BB 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) | #6984BE | 0.032 |
| Deuteranopia (no green cones) | #5B7ABA | 0.022 |
| Tritanopia (no blue cones) | #008E96 | 0.089 |
| Achromatopsia (no color) | #7E7E7E | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4F81BB
#4F81BB
oklch(59.4% 0.105 253.2)
- #A4742E
#A4742E
oklch(59.5% 0.104 73.3)
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 #4F81BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.012
- Steel Blue #4682B4 ΔE 0.015
- Off Blue #5684AE ΔE 0.025
- Dusty Blue #5A86AD ΔE 0.031
- Windows Blue #3778BF ΔE 0.037
- Faded Blue #658CBB ΔE 0.042
- Water Blue #0E87CC ΔE 0.043
- Stormy Blue #507B9C ΔE 0.047
Use #4F81BB 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.