#288BEF
Closest named color: Dodger Blue (#1E90FF). oklch(63.3% 0.174 252.9), rgb(40, 139, 239).
Aa
Black text reads best on this color (6.02:1).
About this color
#288BEF is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.174 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dodger Blue (#1E90FF), ΔE 0.025 away. Black text reads best on it, at 6.02:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.174) |
| Temperature | cool |
| Nearest name | Dodger Blue (#1E90FF) |
| Black text | 6.02:1 |
| White text | 3.48:1 |
Values
| HEX | #288BEF |
| RGB | rgb(40, 139, 239) |
| HSL | hsl(210, 86%, 55%) |
| OKLCH | oklch(63.3% 0.174 252.9) |
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 #288BEF | 3.48:1 | AA large text | Lc -67.3 | Content text, not long reading |
| Black text on #288BEF | 6.02:1 | AA | Lc 42.2 | Non-text elements, placeholder text |
| #288BEF text on white | 3.48:1 | AA large text | Lc 61.9 | Content text, not long reading |
| #288BEF text on black | 6.02:1 | AA | Lc -39.8 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C4DCF8
oklch(88.6% 0.047 252.4)
-
Step 300
300
#9AC4F7
oklch(80.9% 0.085 253.6)
-
Step 400
400
#5EA4F3
oklch(70.7% 0.136 252.8)
-
Step 500
500 (this color)
#288BEF
oklch(63.3% 0.174 252.9)
-
Step 600
600
#0073D3
oklch(55.6% 0.171 252.9)
-
Step 700
700
#0060B3
oklch(49% 0.152 253.2)
-
Step 800
800
#004F94
oklch(42.8% 0.131 252.8)
-
Step 900
900
#03427B
oklch(37.8% 0.112 252.6)
-
Step 950
950
#072748
oklch(27% 0.071 252.7)
#288BEF 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) | #5893F3 | 0.044 |
| Deuteranopia (no green cones) | #3381ED | 0.025 |
| Tritanopia (no blue cones) | #00A3B1 | 0.130 |
| Achromatopsia (no color) | #898989 | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288BEF
#288BEF
oklch(63.3% 0.174 252.9)
- #BA7B00
#BA7B00
oklch(63.3% 0.134 73.4)
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 #288BEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dodger Blue #1E90FF ΔE 0.025
- Dark Sky Blue #448EE4 ΔE 0.026
- Chefchaouen Blue #4895EF ΔE 0.037
- Soft Blue #6488EA ΔE 0.047
- Clear Blue #247AFD ΔE 0.051
- Water Blue #0E87CC ΔE 0.055
- Cornflower Blue #6495ED ΔE 0.058
- Cornflower #6A79F7 ΔE 0.069
Use #288BEF 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.