#0288D3
Closest named color: Water Blue (#0E87CC). oklch(60.4% 0.149 244.1), rgb(2, 136, 211).
Aa
Black text reads best on this color (5.46:1).
About this color
#0288D3 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.149 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.011 away. Black text reads best on it, at 5.46:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.46:1 |
| White text | 3.84:1 |
Values
| HEX | #0288D3 |
| RGB | rgb(2, 136, 211) |
| HSL | hsl(202, 98%, 42%) |
| OKLCH | oklch(60.4% 0.149 244.1) |
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 #0288D3 | 3.84:1 | AA large text | Lc -70.7 | Content text, not long reading |
| Black text on #0288D3 | 5.46:1 | AA | Lc 38.8 | Non-text elements, placeholder text |
| #0288D3 text on white | 3.84:1 | AA large text | Lc 65.2 | Content text, not long reading |
| #0288D3 text on black | 5.46:1 | AA | Lc -36.4 | 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
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C3DDF3
oklch(88.5% 0.041 243.7)
-
Step 300
300
#99C6ED
oklch(80.8% 0.073 245)
-
Step 400
400
#5BA8E4
oklch(70.7% 0.117 244.1)
-
Step 500
500 (this color)
#0288D3
oklch(60.4% 0.149 244.1)
-
Step 600
600
#0079BD
oklch(55.5% 0.138 244.2)
-
Step 700
700
#0066A0
oklch(49.2% 0.121 244)
-
Step 800
800
#005384
oklch(42.6% 0.106 244.3)
-
Step 900
900
#00456F
oklch(37.6% 0.093 244.3)
-
Step 950
950
#042942
oklch(27% 0.061 243.6)
#0288D3 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) | #638BD6 | 0.062 |
| Deuteranopia (no green cones) | #477BD2 | 0.043 |
| Tritanopia (no blue cones) | #009AA3 | 0.102 |
| Achromatopsia (no color) | #828282 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0288D3
#0288D3
oklch(60.4% 0.149 244.1)
- #B86D00
#B86D00
oklch(60.4% 0.136 64.6)
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 #0288D3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.011
- Dark Sky Blue #448EE4 ΔE 0.045
- Windows Blue #3778BF ΔE 0.049
- Cool Blue #4984B8 ΔE 0.049
- Steel Blue #4682B4 ΔE 0.052
- Blue NCS #118AB2 ΔE 0.053
- Nice Blue #107AB0 ΔE 0.061
- Chefchaouen Blue #4895EF ΔE 0.065
Use #0288D3 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.