#4273F5
Closest named color: Clear Blue (#247AFD). oklch(59.5% 0.202 265.1), rgb(66, 115, 245).
Aa
Black text reads best on this color (5.00:1).
About this color
#4273F5 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.202 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.025 away. Black text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.202) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.00:1 |
| White text | 4.19:1 |
Values
| HEX | #4273F5 |
| RGB | rgb(66, 115, 245) |
| HSL | hsl(224, 90%, 61%) |
| OKLCH | oklch(59.5% 0.202 265.1) |
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 #4273F5 | 4.19:1 | AA large text | Lc -74.0 | Content text, not long reading |
| Black text on #4273F5 | 5.00:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #4273F5 text on white | 4.19:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #4273F5 text on black | 5.00:1 | AA | Lc -33.2 | 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 500.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E1EAFE
oklch(93.6% 0.029 266.4)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#729CFF
oklch(70.6% 0.153 265.4)
-
Step 500
500 (this color)
#4273F5
oklch(59.5% 0.202 265.1)
-
Step 600
600
#3263F1
oklch(55.5% 0.22 265.2)
-
Step 700
700
#2651D2
oklch(49.1% 0.204 265.2)
-
Step 800
800
#2043AA
oklch(42.6% 0.17 265.3)
-
Step 900
900
#1E3A86
oklch(37.6% 0.132 265.2)
-
Step 950
950
#12234F
oklch(27% 0.084 265.3)
#4273F5 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) | #0684FA | 0.045 |
| Deuteranopia (no green cones) | #0074F2 | 0.032 |
| Tritanopia (no blue cones) | #0093A9 | 0.161 |
| Achromatopsia (no color) | #7C7C7C | 0.202 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4273F5
#4273F5
oklch(59.5% 0.202 265.1)
- #A07800
#A07800
oklch(59.6% 0.122 85.2)
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 #4273F5, closest first.
No curated palette has a color within ΔE 0.04 of #4273F5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.025
- Royal Blue #4169E1 ΔE 0.038
- Cerulean Blue #056EEE ΔE 0.039
- Neon Blue #4361EE ΔE 0.043
- Cornflower #6A79F7 ΔE 0.049
- Bright Blue #0165FC ΔE 0.053
- Azul #1D5DEC ΔE 0.066
- Medium Slate Blue #7B68EE ΔE 0.071
Use #4273F5 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.