#247BDC
Closest named color: Windows Blue (#3778BF). oklch(58.4% 0.168 254.7), rgb(36, 123, 220).
Aa
Black text reads best on this color (4.94:1).
About this color
#247BDC is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.168 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.044 away. Black text reads best on it, at 4.94:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.94:1 |
| White text | 4.24:1 |
Values
| HEX | #247BDC |
| RGB | rgb(36, 123, 220) |
| HSL | hsl(212, 72%, 50%) |
| OKLCH | oklch(58.4% 0.168 254.7) |
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 #247BDC | 4.24:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #247BDC | 4.94:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #247BDC text on white | 4.24:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #247BDC text on black | 4.94:1 | AA | Lc -32.8 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#A0C4F1
oklch(81% 0.075 254.2)
-
Step 400
400
#6AA3EB
oklch(70.6% 0.122 254.9)
-
Step 500
500
#3F8AE4
oklch(63% 0.155 254.7)
-
Step 600
600 (this color)
#247BDC
oklch(58.4% 0.168 254.7)
-
Step 700
700
#065FB6
oklch(49.1% 0.156 254.6)
-
Step 800
800
#0D4E93
oklch(42.6% 0.129 254.6)
-
Step 900
900
#154275
oklch(37.8% 0.1 254.2)
-
Step 950
950
#0E2745
oklch(27.1% 0.064 254.6)
#247BDC 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) | #4883E0 | 0.037 |
| Deuteranopia (no green cones) | #1F73DA | 0.022 |
| Tritanopia (no blue cones) | #0092A1 | 0.125 |
| Achromatopsia (no color) | #7B7B7B | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #247BDC
#247BDC
oklch(58.4% 0.168 254.7)
- #A66F00
#A66F00
oklch(58.5% 0.124 74.7)
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 #247BDC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.044
- Water Blue #0E87CC ΔE 0.045
- Cerulean Blue #056EEE ΔE 0.048
- Royal Blue #4169E1 ΔE 0.048
- Clear Blue #247AFD ΔE 0.050
- Dark Sky Blue #448EE4 ΔE 0.059
- Nice Blue #107AB0 ΔE 0.070
- Cool Blue #4984B8 ΔE 0.070
Use #247BDC 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.