#288DE7
Closest named color: Dark Sky Blue (#448EE4). oklch(63.2% 0.162 250.4), rgb(40, 141, 231).
Aa
Black text reads best on this color (6.05:1).
About this color
#288DE7 is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.162 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.018 away. Black text reads best on it, at 6.05:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.05:1 |
| White text | 3.46:1 |
Values
| HEX | #288DE7 |
| RGB | rgb(40, 141, 231) |
| HSL | hsl(208, 80%, 53%) |
| OKLCH | oklch(63.2% 0.162 250.4) |
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 #288DE7 | 3.46:1 | AA large text | Lc -67.2 | Content text, not long reading |
| Black text on #288DE7 | 6.05:1 | AA | Lc 42.3 | Non-text elements, placeholder text |
| #288DE7 text on white | 3.46:1 | AA large text | Lc 61.7 | Content text, not long reading |
| #288DE7 text on black | 6.05:1 | AA | Lc -40.0 | 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
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C4DCF6
oklch(88.5% 0.044 250.4)
-
Step 300
300
#9AC5F3
oklch(80.9% 0.08 250.5)
-
Step 400
400
#5FA5EC
oklch(70.6% 0.127 250.4)
-
Step 500
500 (this color)
#288DE7
oklch(63.2% 0.162 250.4)
-
Step 600
600
#0075CC
oklch(55.6% 0.16 250.6)
-
Step 700
700
#0062AC
oklch(49% 0.141 250.5)
-
Step 800
800
#00508E
oklch(42.6% 0.122 250.5)
-
Step 900
900
#034377
oklch(37.7% 0.106 250.4)
-
Step 950
950
#072846
oklch(27.2% 0.067 250.1)
#288DE7 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) | #6193EB | 0.050 |
| Deuteranopia (no green cones) | #4282E5 | 0.030 |
| Tritanopia (no blue cones) | #00A3AF | 0.119 |
| Achromatopsia (no color) | #8A8A8A | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288DE7
#288DE7
oklch(63.2% 0.162 250.4)
- #BD7900
#BD7900
oklch(63.3% 0.137 70.6)
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 #288DE7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.018
- Chefchaouen Blue #4895EF ΔE 0.034
- Dodger Blue #1E90FF ΔE 0.035
- Water Blue #0E87CC ΔE 0.045
- Soft Blue #6488EA ΔE 0.048
- Cornflower Blue #6495ED ΔE 0.055
- Clear Blue #247AFD ΔE 0.063
- Cool Blue #4984B8 ΔE 0.071
Use #288DE7 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.