#4287C7
Closest named color: Cool Blue (#4984B8). oklch(60.8% 0.12 248.9), rgb(66, 135, 199).
Aa
Black text reads best on this color (5.52:1).
About this color
#4287C7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.120 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.023 away. Black text reads best on it, at 5.52:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.52:1 |
| White text | 3.80:1 |
Values
| HEX | #4287C7 |
| RGB | rgb(66, 135, 199) |
| HSL | hsl(209, 54%, 52%) |
| OKLCH | oklch(60.8% 0.12 248.9) |
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 #4287C7 | 3.80:1 | AA large text | Lc -70.8 | Content text, not long reading |
| Black text on #4287C7 | 5.52:1 | AA | Lc 38.8 | Non-text elements, placeholder text |
| #4287C7 text on white | 3.80:1 | AA large text | Lc 65.3 | Content text, not long reading |
| #4287C7 text on black | 5.52:1 | AA | Lc -36.4 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C9DBEE
oklch(88.4% 0.033 249.6)
-
Step 300
300
#A4C4E6
oklch(80.8% 0.059 250.1)
-
Step 400
400
#71A5D9
oklch(70.6% 0.095 249.3)
-
Step 500
500 (this color)
#4287C7
oklch(60.8% 0.12 248.9)
-
Step 600
600
#2877BC
oklch(55.6% 0.131 249.1)
-
Step 700
700
#1964A2
oklch(49.2% 0.122 248.8)
-
Step 800
800
#185283
oklch(42.8% 0.1 248.5)
-
Step 900
900
#1B4469
oklch(37.7% 0.078 248.6)
-
Step 950
950
#11283E
oklch(27% 0.05 249.3)
#4287C7 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) | #6B8ACA | 0.044 |
| Deuteranopia (no green cones) | #587DC6 | 0.032 |
| Tritanopia (no blue cones) | #00969E | 0.092 |
| Achromatopsia (no color) | #838383 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4287C7
#4287C7
oklch(60.8% 0.12 248.9)
- #B17321
#B17321
oklch(60.8% 0.121 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 #4287C7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.023
- Water Blue #0E87CC ΔE 0.026
- Steel Blue #4682B4 ΔE 0.029
- Off Blue #5684AE ΔE 0.040
- Dusty Blue #5A86AD ΔE 0.044
- Faded Blue #658CBB ΔE 0.044
- Windows Blue #3778BF ΔE 0.045
- Dark Sky Blue #448EE4 ΔE 0.045
Use #4287C7 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.