#347CBF
Closest named color: Windows Blue (#3778BF). oklch(57.3% 0.126 249.6), rgb(52, 124, 191).
Aa
Black text reads best on this color (4.78:1).
About this color
#347CBF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.126 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.011 away. Black text reads best on it, at 4.78:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.78:1 |
| White text | 4.39:1 |
Values
| HEX | #347CBF |
| RGB | rgb(52, 124, 191) |
| HSL | hsl(209, 57%, 48%) |
| OKLCH | oklch(57.3% 0.126 249.6) |
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 #347CBF | 4.39:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #347CBF | 4.78:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #347CBF text on white | 4.39:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #347CBF text on black | 4.78:1 | AA | Lc -31.5 | 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
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CADBEE
oklch(88.5% 0.032 251.1)
-
Step 300
300
#A5C4E4
oklch(80.8% 0.056 249.4)
-
Step 400
400
#74A5D7
oklch(70.7% 0.091 249.7)
-
Step 500
500
#4E8ECC
oklch(63.1% 0.115 249.4)
-
Step 600
600 (this color)
#347CBF
oklch(57.3% 0.126 249.6)
-
Step 700
700
#2064A0
oklch(49.2% 0.117 249.4)
-
Step 800
800
#1D5181
oklch(42.5% 0.097 249.7)
-
Step 900
900
#1E4468
oklch(37.7% 0.076 249.4)
-
Step 950
950
#13283D
oklch(27.1% 0.048 250)
#347CBF 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) | #5D80C2 | 0.043 |
| Deuteranopia (no green cones) | #4973BE | 0.028 |
| Tritanopia (no blue cones) | #008C94 | 0.095 |
| Achromatopsia (no color) | #787878 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #347CBF
#347CBF
oklch(57.3% 0.126 249.6)
- #A66900
#A66900
oklch(57.3% 0.124 70.1)
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 #347CBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.011
- Steel Blue #4682B4 ΔE 0.031
- Nice Blue #107AB0 ΔE 0.032
- Water Blue #0E87CC ΔE 0.033
- Cool Blue #4984B8 ΔE 0.034
- Flat Blue #3C73A8 ΔE 0.039
- French Blue #436BAD ΔE 0.050
- Blue NCS #118AB2 ΔE 0.051
Use #347CBF 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.