#287BAF
Closest named color: Nice Blue (#107AB0). oklch(55.8% 0.112 241), rgb(40, 123, 175).
Aa
White text reads best on this color (4.62:1).
About this color
#287BAF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.112 and its hue 241°. 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 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.54:1 |
| White text | 4.62:1 |
Values
| HEX | #287BAF |
| RGB | rgb(40, 123, 175) |
| HSL | hsl(203, 63%, 42%) |
| OKLCH | oklch(55.8% 0.112 241) |
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 #287BAF | 4.62:1 | AA | Lc -77.2 | Fine for body text |
| Black text on #287BAF | 4.54:1 | AA | Lc 32.3 | Non-text elements, placeholder text |
| #287BAF text on white | 4.62:1 | AA | Lc 71.8 | Content text, not long reading |
| #287BAF text on black | 4.54:1 | 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
#A4C5DF
oklch(80.8% 0.051 242)
-
Step 400
400
#72A7CE
oklch(70.6% 0.08 241.2)
-
Step 500
500
#4A91C2
oklch(63.1% 0.103 241.1)
-
Step 600
600 (this color)
#287BAF
oklch(55.8% 0.112 241)
-
Step 700
700
#186796
oklch(49.2% 0.104 240.9)
-
Step 800
800
#185479
oklch(42.7% 0.086 240.7)
-
Step 900
900
#1B4662
oklch(37.8% 0.067 240.5)
-
Step 950
950
#112939
oklch(27% 0.042 240.1)
#287BAF 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) | #637CB1 | 0.056 |
| Deuteranopia (no green cones) | #506FAE | 0.044 |
| Tritanopia (no blue cones) | #00888D | 0.076 |
| Achromatopsia (no color) | #757575 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #287BAF
#287BAF
oklch(55.8% 0.112 241)
- #A26324
#A26324
oklch(55.9% 0.111 61.4)
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 #287BAF, 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 0.025
- Windows Blue #3778BF ΔE 0.031
- Steel Blue #4682B4 ΔE 0.034
- Muted Blue #3B719F ΔE 0.034
- Cerulean #457B9D ΔE 0.034
- Dull Blue #49759C ΔE 0.037
- Cool Blue #4984B8 ΔE 0.041
Use #287BAF 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.