#3F7EB3
Closest named color: Steel Blue (#4682B4). oklch(57.5% 0.105 246.3), rgb(63, 126, 179).
Aa
Black text reads best on this color (4.84:1).
About this color
#3F7EB3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.105 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.014 away. Black text reads best on it, at 4.84:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.84:1 |
| White text | 4.33:1 |
Values
| HEX | #3F7EB3 |
| RGB | rgb(63, 126, 179) |
| HSL | hsl(207, 48%, 47%) |
| OKLCH | oklch(57.5% 0.105 246.3) |
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 #3F7EB3 | 4.33:1 | AA large text | Lc -75.3 | Fine for body text |
| Black text on #3F7EB3 | 4.84:1 | AA | Lc 34.3 | Non-text elements, placeholder text |
| #3F7EB3 text on white | 4.33:1 | AA large text | Lc 69.8 | Content text, not long reading |
| #3F7EB3 text on black | 4.84:1 | AA | Lc -31.9 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CCDBEA
oklch(88.5% 0.026 248.1)
-
Step 300
300
#A9C4DE
oklch(80.9% 0.047 247.4)
-
Step 400
400
#7AA6CD
oklch(70.8% 0.075 245.9)
-
Step 500
500
#568FC0
oklch(63.1% 0.096 246)
-
Step 600
600 (this color)
#3F7EB3
oklch(57.5% 0.105 246.3)
-
Step 700
700
#2B6594
oklch(49.1% 0.097 246.1)
-
Step 800
800
#255278
oklch(42.6% 0.08 246.7)
-
Step 900
900
#234461
oklch(37.6% 0.063 246.9)
-
Step 950
950
#152839
oklch(26.9% 0.04 246.9)
#3F7EB3 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) | #6780B5 | 0.044 |
| Deuteranopia (no green cones) | #5774B2 | 0.034 |
| Tritanopia (no blue cones) | #008B91 | 0.080 |
| Achromatopsia (no color) | #797979 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F7EB3
#3F7EB3
oklch(57.5% 0.105 246.3)
- #A26B2C
#A26B2C
oklch(57.5% 0.105 66.3)
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 #3F7EB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.014
- Cool Blue #4984B8 ΔE 0.021
- Windows Blue #3778BF ΔE 0.029
- Nice Blue #107AB0 ΔE 0.031
- Off Blue #5684AE ΔE 0.032
- Cerulean #457B9D ΔE 0.033
- Flat Blue #3C73A8 ΔE 0.033
- Stormy Blue #507B9C ΔE 0.037
Use #3F7EB3 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.