#288DCF
Closest named color: Water Blue (#0E87CC). oklch(61.8% 0.134 242.9), rgb(40, 141, 207).
Aa
Black text reads best on this color (5.80:1).
About this color
#288DCF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.134 and its hue 243°. 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 5.80:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.80:1 |
| White text | 3.61:1 |
Values
| HEX | #288DCF |
| RGB | rgb(40, 141, 207) |
| HSL | hsl(204, 68%, 48%) |
| OKLCH | oklch(61.8% 0.134 242.9) |
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 #288DCF | 3.61:1 | AA large text | Lc -68.8 | Content text, not long reading |
| Black text on #288DCF | 5.80:1 | AA | Lc 40.7 | Non-text elements, placeholder text |
| #288DCF text on white | 3.61:1 | AA large text | Lc 63.4 | Content text, not long reading |
| #288DCF text on black | 5.80:1 | AA | Lc -38.3 | 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
#E0ECF6
oklch(93.7% 0.019 243)
-
Step 200
200
#C5DDF0
oklch(88.6% 0.037 241.8)
-
Step 300
300
#9CC6E8
oklch(80.8% 0.066 243.1)
-
Step 400
400
#63A8DD
oklch(70.7% 0.105 243.2)
-
Step 500
500 (this color)
#288DCF
oklch(61.8% 0.134 242.9)
-
Step 600
600
#007ABB
oklch(55.7% 0.134 242.9)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005482
oklch(42.8% 0.102 242.4)
-
Step 900
900
#06466C
oklch(37.8% 0.087 242.6)
-
Step 950
950
#09293F
oklch(27% 0.055 243)
#288DCF 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) | #6E8FD2 | 0.061 |
| Deuteranopia (no green cones) | #5780CE | 0.046 |
| Tritanopia (no blue cones) | #009DA5 | 0.091 |
| Achromatopsia (no color) | #868686 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288DCF
#288DCF
oklch(61.8% 0.134 242.9)
- #BD7117
#BD7117
oklch(61.9% 0.134 63.1)
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 #288DCF, 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 0.038
- Cool Blue #4984B8 ΔE 0.040
- Steel Blue #4682B4 ΔE 0.046
- Blue NCS #118AB2 ΔE 0.046
- Faded Blue #658CBB ΔE 0.055
- Off Blue #5684AE ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.057
Use #288DCF 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.