#247ADD
Closest named color: Cerulean Blue (#056EEE). oklch(58.3% 0.171 255.2), rgb(36, 122, 221).
Aa
Black text reads best on this color (4.90:1).
About this color
#247ADD is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.171 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.044 away. Black text reads best on it, at 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.90:1 |
| White text | 4.28:1 |
Values
| HEX | #247ADD |
| RGB | rgb(36, 122, 221) |
| HSL | hsl(212, 73%, 50%) |
| OKLCH | oklch(58.3% 0.171 255.2) |
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 #247ADD | 4.28:1 | AA large text | Lc -74.6 | Content text, not long reading |
| Black text on #247ADD | 4.90:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #247ADD text on white | 4.28:1 | AA large text | Lc 69.1 | Content text, not long reading |
| #247ADD text on black | 4.90:1 | AA | Lc -32.6 | 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
#C7DBF6
oklch(88.5% 0.043 255.9)
-
Step 300
300
#A0C3F2
oklch(80.8% 0.077 255.9)
-
Step 400
400
#6AA3EC
oklch(70.7% 0.123 255.2)
-
Step 500
500
#3F8AE6
oklch(63.1% 0.157 255.2)
-
Step 600
600 (this color)
#247ADD
oklch(58.3% 0.171 255.2)
-
Step 700
700
#075FB8
oklch(49.2% 0.159 255.1)
-
Step 800
800
#0D4E95
oklch(42.8% 0.132 255.1)
-
Step 900
900
#154176
oklch(37.6% 0.102 255.3)
-
Step 950
950
#0E2745
oklch(27.1% 0.064 254.6)
#247ADD 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) | #4583E1 | 0.037 |
| Deuteranopia (no green cones) | #1873DB | 0.021 |
| Tritanopia (no blue cones) | #0092A1 | 0.128 |
| Achromatopsia (no color) | #7A7A7A | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #247ADD
#247ADD
oklch(58.3% 0.171 255.2)
- #A56F00
#A56F00
oklch(58.4% 0.123 75.3)
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 #247ADD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.044
- Royal Blue #4169E1 ΔE 0.045
- Windows Blue #3778BF ΔE 0.046
- Water Blue #0E87CC ΔE 0.048
- Clear Blue #247AFD ΔE 0.049
- Dark Sky Blue #448EE4 ΔE 0.062
- Neon Blue #4361EE ΔE 0.069
- Nice Blue #107AB0 ΔE 0.072
Use #247ADD 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.