#287BE4
Closest named color: Clear Blue (#247AFD). oklch(59.1% 0.178 256.6), rgb(40, 123, 228).
Aa
Black text reads best on this color (5.04:1).
About this color
#287BE4 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.178 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.038 away. Black text reads best on it, at 5.04:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.178) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.04:1 |
| White text | 4.16:1 |
Values
| HEX | #287BE4 |
| RGB | rgb(40, 123, 228) |
| HSL | hsl(214, 78%, 53%) |
| OKLCH | oklch(59.1% 0.178 256.6) |
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 #287BE4 | 4.16:1 | AA large text | Lc -73.6 | Content text, not long reading |
| Black text on #287BE4 | 5.04:1 | AA | Lc 35.9 | Non-text elements, placeholder text |
| #287BE4 text on white | 4.16:1 | AA large text | Lc 68.1 | Content text, not long reading |
| #287BE4 text on black | 5.04:1 | AA | Lc -33.5 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C7DBF7
oklch(88.5% 0.044 256.8)
-
Step 300
300
#9FC3F4
oklch(80.8% 0.08 256.2)
-
Step 400
400
#6AA2EF
oklch(70.6% 0.128 256.6)
-
Step 500
500
#4089EA
oklch(63.2% 0.163 256.6)
-
Step 600
600 (this color)
#287BE4
oklch(59.1% 0.178 256.6)
-
Step 700
700
#0A5DBB
oklch(49% 0.165 256.5)
-
Step 800
800
#0F4D98
oklch(42.8% 0.137 256.5)
-
Step 900
900
#154179
oklch(37.8% 0.107 256.3)
-
Step 950
950
#0E2647
oklch(27% 0.068 257.1)
#287BE4 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) | #4185E8 | 0.034 |
| Deuteranopia (no green cones) | #0574E2 | 0.024 |
| Tritanopia (no blue cones) | #0094A4 | 0.135 |
| Achromatopsia (no color) | #7C7C7C | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #287BE4
#287BE4
oklch(59.1% 0.178 256.6)
- #A67200
#A67200
oklch(59.1% 0.124 77.1)
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 #287BE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.038
- Cerulean Blue #056EEE ΔE 0.042
- Royal Blue #4169E1 ΔE 0.045
- Water Blue #0E87CC ΔE 0.054
- Windows Blue #3778BF ΔE 0.056
- Dark Sky Blue #448EE4 ΔE 0.058
- Dodger Blue #1E90FF ΔE 0.063
- Neon Blue #4361EE ΔE 0.066
Use #287BE4 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.