#288CED
Closest named color: Dark Sky Blue (#448EE4). oklch(63.4% 0.17 252.1), rgb(40, 140, 237).
Aa
Black text reads best on this color (6.06:1).
About this color
#288CED is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.170 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.023 away. Black text reads best on it, at 6.06:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.06:1 |
| White text | 3.46:1 |
Values
| HEX | #288CED |
| RGB | rgb(40, 140, 237) |
| HSL | hsl(210, 85%, 54%) |
| OKLCH | oklch(63.4% 0.17 252.1) |
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 #288CED | 3.46:1 | AA large text | Lc -67.1 | Content text, not long reading |
| Black text on #288CED | 6.06:1 | AA | Lc 42.4 | Non-text elements, placeholder text |
| #288CED text on white | 3.46:1 | AA large text | Lc 61.7 | Content text, not long reading |
| #288CED text on black | 6.06:1 | 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
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C4DCF8
oklch(88.6% 0.047 252.4)
-
Step 300
300
#9AC5F6
oklch(81% 0.083 252.1)
-
Step 400
400
#5EA4F1
oklch(70.6% 0.134 252.2)
-
Step 500
500 (this color)
#288CED
oklch(63.4% 0.17 252.1)
-
Step 600
600
#0074D1
oklch(55.7% 0.167 252.1)
-
Step 700
700
#0061B1
oklch(49.1% 0.148 252.3)
-
Step 800
800
#004F92
oklch(42.6% 0.129 252.3)
-
Step 900
900
#03427A
oklch(37.7% 0.111 252.2)
-
Step 950
950
#072747
oklch(26.9% 0.07 252)
#288CED 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) | #5B93F1 | 0.045 |
| Deuteranopia (no green cones) | #3982EB | 0.026 |
| Tritanopia (no blue cones) | #00A3B1 | 0.125 |
| Achromatopsia (no color) | #8A8A8A | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288CED
#288CED
oklch(63.4% 0.17 252.1)
- #BC7A00
#BC7A00
oklch(63.3% 0.136 71.8)
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 #288CED, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.023
- Dodger Blue #1E90FF ΔE 0.027
- Chefchaouen Blue #4895EF ΔE 0.034
- Soft Blue #6488EA ΔE 0.047
- Water Blue #0E87CC ΔE 0.052
- Clear Blue #247AFD ΔE 0.055
- Cornflower Blue #6495ED ΔE 0.056
- Cornflower #6A79F7 ΔE 0.072
Use #288CED 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.