#3B7DB3
Closest named color: Steel Blue (#4682B4). oklch(57.1% 0.107 245.9), rgb(59, 125, 179).
Aa
Black text reads best on this color (4.77:1).
About this color
#3B7DB3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.107 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.019 away. Black text reads best on it, at 4.77:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.77:1 |
| White text | 4.40:1 |
Values
| HEX | #3B7DB3 |
| RGB | rgb(59, 125, 179) |
| HSL | hsl(207, 50%, 47%) |
| OKLCH | oklch(57.1% 0.107 245.9) |
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 #3B7DB3 | 4.40:1 | AA large text | Lc -75.8 | Fine for body text |
| Black text on #3B7DB3 | 4.77:1 | AA | Lc 33.8 | Non-text elements, placeholder text |
| #3B7DB3 text on white | 4.40:1 | AA large text | Lc 70.3 | Content text, not long reading |
| #3B7DB3 text on black | 4.77:1 | AA | Lc -31.4 | 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
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CBDBEA
oklch(88.4% 0.027 246.4)
-
Step 300
300
#A8C4DF
oklch(80.8% 0.049 247.5)
-
Step 400
400
#78A6CE
oklch(70.7% 0.077 245.4)
-
Step 500
500
#548FC2
oklch(63.1% 0.099 246.3)
-
Step 600
600 (this color)
#3B7DB3
oklch(57.1% 0.107 245.9)
-
Step 700
700
#286596
oklch(49.1% 0.1 246.2)
-
Step 800
800
#235379
oklch(42.8% 0.082 245.4)
-
Step 900
900
#224562
oklch(37.8% 0.064 245.6)
-
Step 950
950
#152839
oklch(26.9% 0.04 246.9)
#3B7DB3 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) | #657FB5 | 0.045 |
| Deuteranopia (no green cones) | #5573B2 | 0.035 |
| Tritanopia (no blue cones) | #008A90 | 0.080 |
| Achromatopsia (no color) | #787878 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B7DB3
#3B7DB3
oklch(57.1% 0.107 245.9)
- #A26928
#A26928
oklch(57% 0.107 65.7)
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 #3B7DB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.019
- Cool Blue #4984B8 ΔE 0.026
- Windows Blue #3778BF ΔE 0.026
- Nice Blue #107AB0 ΔE 0.027
- Flat Blue #3C73A8 ΔE 0.030
- Cerulean #457B9D ΔE 0.034
- Off Blue #5684AE ΔE 0.037
- Dull Blue #49759C ΔE 0.038
Use #3B7DB3 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.