#347BBB
Closest named color: Windows Blue (#3778BF). oklch(56.8% 0.122 248.8), rgb(52, 123, 187).
Aa
Black text reads best on this color (4.69:1).
About this color
#347BBB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.122 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.012 away. Black text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.69:1 |
| White text | 4.47:1 |
Values
| HEX | #347BBB |
| RGB | rgb(52, 123, 187) |
| HSL | hsl(208, 56%, 47%) |
| OKLCH | oklch(56.8% 0.122 248.8) |
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 #347BBB | 4.47:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #347BBB | 4.69:1 | AA | Lc 33.4 | Non-text elements, placeholder text |
| #347BBB text on white | 4.47:1 | AA large text | Lc 70.7 | Content text, not long reading |
| #347BBB 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
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADBED
oklch(88.4% 0.031 249.7)
-
Step 300
300
#A6C4E3
oklch(80.9% 0.055 249.4)
-
Step 400
400
#75A5D5
oklch(70.6% 0.088 249.2)
-
Step 500
500
#4F8ECA
oklch(63.1% 0.112 249)
-
Step 600
600 (this color)
#347BBB
oklch(56.8% 0.122 248.8)
-
Step 700
700
#22649E
oklch(49.1% 0.114 249)
-
Step 800
800
#1E5280
oklch(42.8% 0.094 248.7)
-
Step 900
900
#1F4467
oklch(37.7% 0.074 249.2)
-
Step 950
950
#13283C
oklch(27% 0.046 248.8)
#347BBB 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) | #5E7EBE | 0.043 |
| Deuteranopia (no green cones) | #4B71BA | 0.032 |
| Tritanopia (no blue cones) | #008A92 | 0.090 |
| Achromatopsia (no color) | #777777 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #347BBB
#347BBB
oklch(56.8% 0.122 248.8)
- #A56708
#A56708
oklch(56.8% 0.122 68.3)
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 #347BBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.012
- Nice Blue #107AB0 ΔE 0.027
- Steel Blue #4682B4 ΔE 0.030
- Flat Blue #3C73A8 ΔE 0.033
- Cool Blue #4984B8 ΔE 0.035
- Water Blue #0E87CC ΔE 0.038
- French Blue #436BAD ΔE 0.045
- Muted Blue #3B719F ΔE 0.047
Use #347BBB 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.