#288CFF
Closest named color: Dodger Blue (#1E90FF). oklch(64.5% 0.193 255.4), rgb(40, 140, 255).
Aa
Black text reads best on this color (6.28:1).
About this color
#288CFF is a medium-light, vivid blue. In OKLCH its lightness is 65%, its chroma 0.193 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dodger Blue (#1E90FF), ΔE 0.010 away. Black text reads best on it, at 6.28:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.193) |
| Temperature | cool |
| Nearest name | Dodger Blue (#1E90FF) |
| Black text | 6.28:1 |
| White text | 3.34:1 |
Values
| HEX | #288CFF |
| RGB | rgb(40, 140, 255) |
| HSL | hsl(212, 100%, 58%) |
| OKLCH | oklch(64.5% 0.193 255.4) |
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 #288CFF | 3.34:1 | AA large text | Lc -65.7 | Content text, not long reading |
| Black text on #288CFF | 6.28:1 | AA | Lc 43.8 | Non-text elements, placeholder text |
| #288CFF text on white | 3.34:1 | AA large text | Lc 60.3 | Content text, not long reading |
| #288CFF text on black | 6.28:1 | AA | Lc -41.5 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFC
oklch(93.5% 0.027 255.1)
-
Step 200
200
#C3DBFC
oklch(88.4% 0.052 256.4)
-
Step 300
300
#98C4FD
oklch(81% 0.094 255.2)
-
Step 400
400
#5BA2FC
oklch(70.6% 0.151 255.3)
-
Step 500
500 (this color)
#288CFF
oklch(64.5% 0.193 255.4)
-
Step 600
600
#0070DC
oklch(55.6% 0.186 255.4)
-
Step 700
700
#005EBA
oklch(49.1% 0.163 255.3)
-
Step 800
800
#004D9A
oklch(42.7% 0.142 255.2)
-
Step 900
900
#004082
oklch(37.8% 0.125 255.2)
-
Step 950
950
#06264C
oklch(27% 0.079 255.4)
#288CFF 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) | #4D97FF | 0.041 |
| Deuteranopia (no green cones) | #1184FD | 0.024 |
| Tritanopia (no blue cones) | #00A8B9 | 0.146 |
| Achromatopsia (no color) | #8C8C8C | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288CFF
#288CFF
oklch(64.5% 0.193 255.4)
- #BD8000
#BD8000
oklch(64.6% 0.136 75.4)
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 #288CFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dodger Blue #1E90FF ΔE 0.010
- Chefchaouen Blue #4895EF ΔE 0.043
- Dark Sky Blue #448EE4 ΔE 0.044
- Clear Blue #247AFD ΔE 0.046
- Soft Blue #6488EA ΔE 0.053
- Cornflower Blue #6495ED ΔE 0.062
- Cornflower #6A79F7 ΔE 0.066
- Water Blue #0E87CC ΔE 0.079
Use #288CFF 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.