#3A7DBB
Closest named color: Windows Blue (#3778BF). oklch(57.5% 0.118 249), rgb(58, 125, 187).
Aa
Black text reads best on this color (4.83:1).
About this color
#3A7DBB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.118 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.017 away. Black text reads best on it, at 4.83:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.83:1 |
| White text | 4.34:1 |
Values
| HEX | #3A7DBB |
| RGB | rgb(58, 125, 187) |
| HSL | hsl(209, 53%, 48%) |
| OKLCH | oklch(57.5% 0.118 249) |
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 #3A7DBB | 4.34:1 | AA large text | Lc -75.3 | Fine for body text |
| Black text on #3A7DBB | 4.83:1 | AA | Lc 34.2 | Non-text elements, placeholder text |
| #3A7DBB text on white | 4.34:1 | AA large text | Lc 69.8 | Content text, not long reading |
| #3A7DBB text on black | 4.83:1 | AA | Lc -31.8 | 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
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CBDBEC
oklch(88.5% 0.029 249.8)
-
Step 300
300
#A7C4E2
oklch(80.9% 0.053 249.4)
-
Step 400
400
#77A5D4
oklch(70.7% 0.085 249.6)
-
Step 500
500
#528EC8
oklch(63.1% 0.108 249.1)
-
Step 600
600 (this color)
#3A7DBB
oklch(57.5% 0.118 249)
-
Step 700
700
#26649C
oklch(49.1% 0.11 249.2)
-
Step 800
800
#21527E
oklch(42.7% 0.09 248.7)
-
Step 900
900
#214465
oklch(37.7% 0.07 248.9)
-
Step 950
950
#14283B
oklch(27% 0.044 248.6)
#3A7DBB 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) | #6180BE | 0.042 |
| Deuteranopia (no green cones) | #4F74BA | 0.029 |
| Tritanopia (no blue cones) | #008C93 | 0.090 |
| Achromatopsia (no color) | #797979 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A7DBB
#3A7DBB
oklch(57.5% 0.118 249)
- #A56A17
#A56A17
oklch(57.5% 0.117 68.9)
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 #3A7DBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.017
- Steel Blue #4682B4 ΔE 0.023
- Cool Blue #4984B8 ΔE 0.027
- Nice Blue #107AB0 ΔE 0.031
- Water Blue #0E87CC ΔE 0.036
- Flat Blue #3C73A8 ΔE 0.037
- Off Blue #5684AE ΔE 0.042
- Blue NCS #118AB2 ΔE 0.046
Use #3A7DBB 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.