#0288DA
Closest named color: Water Blue (#0E87CC). oklch(60.8% 0.157 246.3), rgb(2, 136, 218).
Aa
Black text reads best on this color (5.53:1).
About this color
#0288DA is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.157 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.021 away. Black text reads best on it, at 5.53:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.53:1 |
| White text | 3.79:1 |
Values
| HEX | #0288DA |
| RGB | rgb(2, 136, 218) |
| HSL | hsl(203, 98%, 43%) |
| OKLCH | oklch(60.8% 0.157 246.3) |
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 #0288DA | 3.79:1 | AA large text | Lc -70.3 | Content text, not long reading |
| Black text on #0288DA | 5.53:1 | AA | Lc 39.3 | Non-text elements, placeholder text |
| #0288DA text on white | 3.79:1 | AA large text | Lc 64.8 | Content text, not long reading |
| #0288DA text on black | 5.53:1 | AA | Lc -36.9 | 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
#DEECF8
oklch(93.6% 0.022 243.8)
-
Step 200
200
#C3DDF4
oklch(88.6% 0.042 245)
-
Step 300
300
#98C6F0
oklch(80.9% 0.077 246.5)
-
Step 400
400
#5AA7E8
oklch(70.6% 0.123 246.2)
-
Step 500
500 (this color)
#0288DA
oklch(60.8% 0.157 246.3)
-
Step 600
600
#0078C2
oklch(55.6% 0.145 246.5)
-
Step 700
700
#0065A4
oklch(49.2% 0.127 246.3)
-
Step 800
800
#005287
oklch(42.6% 0.111 246.5)
-
Step 900
900
#004472
oklch(37.6% 0.099 246.8)
-
Step 950
950
#042844
oklch(26.9% 0.065 247)
#0288DA 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) | #5F8CDD | 0.058 |
| Deuteranopia (no green cones) | #417BD8 | 0.040 |
| Tritanopia (no blue cones) | #009CA6 | 0.111 |
| Achromatopsia (no color) | #838383 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0288DA
#0288DA
oklch(60.8% 0.157 246.3)
- #B86F00
#B86F00
oklch(60.8% 0.135 66)
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 #0288DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.021
- Dark Sky Blue #448EE4 ΔE 0.039
- Windows Blue #3778BF ΔE 0.054
- Cool Blue #4984B8 ΔE 0.057
- Dodger Blue #1E90FF ΔE 0.059
- Chefchaouen Blue #4895EF ΔE 0.059
- Steel Blue #4682B4 ΔE 0.061
- Blue NCS #118AB2 ΔE 0.064
Use #0288DA 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.