#287BAE
Closest named color: Nice Blue (#107AB0). oklch(55.8% 0.111 240.5), rgb(40, 123, 174).
Aa
White text reads best on this color (4.63:1).
About this color
#287BAE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.111 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.011 away. White text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.53:1 |
| White text | 4.63:1 |
Values
| HEX | #287BAE |
| RGB | rgb(40, 123, 174) |
| HSL | hsl(203, 63%, 42%) |
| OKLCH | oklch(55.8% 0.111 240.5) |
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 #287BAE | 4.63:1 | AA | Lc -77.3 | Fine for body text |
| Black text on #287BAE | 4.53:1 | AA | Lc 32.3 | Non-text elements, placeholder text |
| #287BAE text on white | 4.63:1 | AA | Lc 71.8 | Content text, not long reading |
| #287BAE text on black | 4.53:1 | AA | Lc -29.9 | Dividers and decoration only |
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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEA
oklch(88.5% 0.027 241.2)
-
Step 300
300
#A4C6DE
oklch(81% 0.05 239)
-
Step 400
400
#72A7CE
oklch(70.6% 0.08 241.2)
-
Step 500
500
#4A91C1
oklch(63.1% 0.102 240.6)
-
Step 600
600 (this color)
#287BAE
oklch(55.8% 0.111 240.5)
-
Step 700
700
#186795
oklch(49.1% 0.103 240.4)
-
Step 800
800
#185479
oklch(42.7% 0.086 240.7)
-
Step 900
900
#1B4661
oklch(37.7% 0.066 239.5)
-
Step 950
950
#112939
oklch(27% 0.042 240.1)
#287BAE 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) | #637CB0 | 0.056 |
| Deuteranopia (no green cones) | #516FAD | 0.045 |
| Tritanopia (no blue cones) | #00888D | 0.075 |
| Achromatopsia (no color) | #757575 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #287BAE
#287BAE
oklch(55.8% 0.111 240.5)
- #A26225
#A26225
oklch(55.7% 0.111 60.3)
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 #287BAE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.011
- Flat Blue #3C73A8 ΔE 0.024
- Windows Blue #3778BF ΔE 0.032
- Muted Blue #3B719F ΔE 0.033
- Cerulean #457B9D ΔE 0.033
- Steel Blue #4682B4 ΔE 0.034
- Dull Blue #49759C ΔE 0.036
- Cool Blue #4984B8 ΔE 0.041
Use #287BAE 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.