#288AE1
Closest named color: Dark Sky Blue (#448EE4). oklch(62.2% 0.158 250.2), rgb(40, 138, 225).
Aa
Black text reads best on this color (5.81:1).
About this color
#288AE1 is a medium-light, vivid blue. In OKLCH its lightness is 62%, its chroma 0.158 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.023 away. Black text reads best on it, at 5.81:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.81:1 |
| White text | 3.61:1 |
Values
| HEX | #288AE1 |
| RGB | rgb(40, 138, 225) |
| HSL | hsl(208, 76%, 52%) |
| OKLCH | oklch(62.2% 0.158 250.2) |
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 #288AE1 | 3.61:1 | AA large text | Lc -68.7 | Content text, not long reading |
| Black text on #288AE1 | 5.81:1 | AA | Lc 40.8 | Non-text elements, placeholder text |
| #288AE1 text on white | 3.61:1 | AA large text | Lc 63.2 | Content text, not long reading |
| #288AE1 text on black | 5.81:1 | AA | Lc -38.4 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C5DCF5
oklch(88.5% 0.042 250.5)
-
Step 300
300
#9BC5F1
oklch(80.9% 0.077 250)
-
Step 400
400
#61A5EA
oklch(70.6% 0.123 250.3)
-
Step 500
500 (this color)
#288AE1
oklch(62.2% 0.158 250.2)
-
Step 600
600
#0075CB
oklch(55.5% 0.159 250.4)
-
Step 700
700
#0063AC
oklch(49.2% 0.139 250)
-
Step 800
800
#00518E
oklch(42.8% 0.121 249.9)
-
Step 900
900
#064375
oklch(37.7% 0.102 250.1)
-
Step 950
950
#082845
oklch(27.1% 0.065 249.8)
#288AE1 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) | #6090E5 | 0.050 |
| Deuteranopia (no green cones) | #427FDF | 0.031 |
| Tritanopia (no blue cones) | #009FAB | 0.115 |
| Achromatopsia (no color) | #878787 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288AE1
#288AE1
oklch(62.2% 0.158 250.2)
- #B97600
#B97600
oklch(62.2% 0.134 70.4)
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 #288AE1, 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
- Water Blue #0E87CC ΔE 0.035
- Chefchaouen Blue #4895EF ΔE 0.043
- Dodger Blue #1E90FF ΔE 0.045
- Soft Blue #6488EA ΔE 0.052
- Cornflower Blue #6495ED ΔE 0.062
- Cool Blue #4984B8 ΔE 0.063
- Clear Blue #247AFD ΔE 0.063
Use #288AE1 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.