#3F7AB9
Closest named color: Windows Blue (#3778BF). oklch(56.9% 0.116 251.9), rgb(63, 122, 185).
Aa
Black text reads best on this color (4.69:1).
About this color
#3F7AB9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.116 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.014 away. Black text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.69:1 |
| White text | 4.47:1 |
Values
| HEX | #3F7AB9 |
| RGB | rgb(63, 122, 185) |
| HSL | hsl(211, 49%, 49%) |
| OKLCH | oklch(56.9% 0.116 251.9) |
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 #3F7AB9 | 4.47:1 | AA large text | Lc -76.3 | Fine for body text |
| Black text on #3F7AB9 | 4.69:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #3F7AB9 text on white | 4.47:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #3F7AB9 text on black | 4.69:1 | AA | Lc -30.9 | 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
#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
#A9C3E2
oklch(80.8% 0.052 253)
-
Step 400
400
#7AA4D4
oklch(70.7% 0.084 252.3)
-
Step 500
500
#578DC8
oklch(63.1% 0.106 251.8)
-
Step 600
600 (this color)
#3F7AB9
oklch(56.9% 0.116 251.9)
-
Step 700
700
#2D639C
oklch(49.1% 0.108 252)
-
Step 800
800
#26517E
oklch(42.7% 0.089 251.6)
-
Step 900
900
#244365
oklch(37.6% 0.069 252.1)
-
Step 950
950
#16283B
oklch(27.1% 0.043 250.9)
#3F7AB9 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) | #5E7DBC | 0.035 |
| Deuteranopia (no green cones) | #4D72B8 | 0.024 |
| Tritanopia (no blue cones) | #008991 | 0.092 |
| Achromatopsia (no color) | #777777 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F7AB9
#3F7AB9
oklch(56.9% 0.116 251.9)
- #A16A13
#A16A13
oklch(57% 0.116 71.6)
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 #3F7AB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.014
- Steel Blue #4682B4 ΔE 0.028
- Flat Blue #3C73A8 ΔE 0.031
- Nice Blue #107AB0 ΔE 0.032
- Cool Blue #4984B8 ΔE 0.032
- French Blue #436BAD ΔE 0.042
- Water Blue #0E87CC ΔE 0.043
- Dull Blue #49759C ΔE 0.044
Use #3F7AB9 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.