#288DD3
Closest named color: Water Blue (#0E87CC). oklch(62% 0.138 244.4), rgb(40, 141, 211).
Aa
Black text reads best on this color (5.84:1).
About this color
#288DD3 is a medium-light, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.138 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.022 away. Black text reads best on it, at 5.84:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.84:1 |
| White text | 3.59:1 |
Values
| HEX | #288DD3 |
| RGB | rgb(40, 141, 211) |
| HSL | hsl(205, 68%, 49%) |
| OKLCH | oklch(62% 0.138 244.4) |
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 #288DD3 | 3.59:1 | AA large text | Lc -68.6 | Content text, not long reading |
| Black text on #288DD3 | 5.84:1 | AA | Lc 41.0 | Non-text elements, placeholder text |
| #288DD3 text on white | 3.59:1 | AA large text | Lc 63.1 | Content text, not long reading |
| #288DD3 text on black | 5.84:1 | AA | Lc -38.6 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C5DCF1
oklch(88.4% 0.038 245.8)
-
Step 300
300
#9CC6EA
oklch(80.9% 0.068 244.6)
-
Step 400
400
#62A8DF
oklch(70.8% 0.108 243.9)
-
Step 500
500 (this color)
#288DD3
oklch(62% 0.138 244.4)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
Step 700
700
#0066A0
oklch(49.2% 0.121 244)
-
Step 800
800
#005384
oklch(42.6% 0.106 244.3)
-
Step 900
900
#06456E
oklch(37.7% 0.091 244.8)
-
Step 950
950
#082940
oklch(27% 0.057 243.6)
#288DD3 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) | #6C8FD6 | 0.059 |
| Deuteranopia (no green cones) | #5480D2 | 0.044 |
| Tritanopia (no blue cones) | #009EA6 | 0.096 |
| Achromatopsia (no color) | #878787 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288DD3
#288DD3
oklch(62% 0.138 244.4)
- #BE7106
#BE7106
oklch(62% 0.138 64.3)
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 #288DD3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.022
- Dark Sky Blue #448EE4 ΔE 0.033
- Cool Blue #4984B8 ΔE 0.045
- Steel Blue #4682B4 ΔE 0.051
- Chefchaouen Blue #4895EF ΔE 0.052
- Blue NCS #118AB2 ΔE 0.052
- Faded Blue #658CBB ΔE 0.058
- Windows Blue #3778BF ΔE 0.060
Use #288DD3 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.