#3C7BB9
Closest named color: Windows Blue (#3778BF). oklch(57% 0.116 250.3), rgb(60, 123, 185).
Aa
Black text reads best on this color (4.72:1).
About this color
#3C7BB9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.116 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.015 away. Black text reads best on it, at 4.72:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.72:1 |
| White text | 4.44:1 |
Values
| HEX | #3C7BB9 |
| RGB | rgb(60, 123, 185) |
| HSL | hsl(210, 51%, 48%) |
| OKLCH | oklch(57% 0.116 250.3) |
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 #3C7BB9 | 4.44:1 | AA large text | Lc -76.1 | Fine for body text |
| Black text on #3C7BB9 | 4.72:1 | AA | Lc 33.5 | Non-text elements, placeholder text |
| #3C7BB9 text on white | 4.44:1 | AA large text | Lc 70.6 | Content text, not long reading |
| #3C7BB9 text on black | 4.72:1 | AA | Lc -31.1 | 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 600.
-
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
#CBDBEC
oklch(88.5% 0.029 249.8)
-
Step 300
300
#A8C4E2
oklch(81% 0.052 250.3)
-
Step 400
400
#78A5D3
oklch(70.7% 0.083 249.6)
-
Step 500
500
#548EC8
oklch(63.2% 0.107 249.9)
-
Step 600
600 (this color)
#3C7BB9
oklch(57% 0.116 250.3)
-
Step 700
700
#2A649B
oklch(49.2% 0.107 249.9)
-
Step 800
800
#24517E
oklch(42.6% 0.09 250.8)
-
Step 900
900
#224465
oklch(37.7% 0.069 249.5)
-
Step 950
950
#15283B
oklch(27.1% 0.044 249.7)
#3C7BB9 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) | #607EBC | 0.040 |
| Deuteranopia (no green cones) | #4E72B8 | 0.028 |
| Tritanopia (no blue cones) | #008A91 | 0.091 |
| Achromatopsia (no color) | #787878 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3C7BB9
#3C7BB9
oklch(57% 0.116 250.3)
- #A26A15
#A26A15
oklch(57.1% 0.116 70.8)
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 #3C7BB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.015
- Steel Blue #4682B4 ΔE 0.026
- Nice Blue #107AB0 ΔE 0.030
- Cool Blue #4984B8 ΔE 0.030
- Flat Blue #3C73A8 ΔE 0.031
- Water Blue #0E87CC ΔE 0.041
- Off Blue #5684AE ΔE 0.044
- Cerulean #457B9D ΔE 0.044
Use #3C7BB9 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.