#288FD7
Closest named color: Dark Sky Blue (#448EE4). oklch(62.7% 0.141 244.7), rgb(40, 143, 215).
Aa
Black text reads best on this color (6.00:1).
About this color
#288FD7 is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.141 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.028 away. Black text reads best on it, at 6.00:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.00:1 |
| White text | 3.49:1 |
Values
| HEX | #288FD7 |
| RGB | rgb(40, 143, 215) |
| HSL | hsl(205, 69%, 50%) |
| OKLCH | oklch(62.7% 0.141 244.7) |
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 #288FD7 | 3.49:1 | AA large text | Lc -67.6 | Content text, not long reading |
| Black text on #288FD7 | 6.00:1 | AA | Lc 42.0 | Non-text elements, placeholder text |
| #288FD7 text on white | 3.49:1 | AA large text | Lc 62.1 | Content text, not long reading |
| #288FD7 text on black | 6.00:1 | AA | Lc -39.6 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C5DDF1
oklch(88.6% 0.038 243.3)
-
Step 300
300
#9BC6EB
oklch(80.9% 0.07 244.8)
-
Step 400
400
#61A8E1
oklch(70.8% 0.11 244.5)
-
Step 500
500 (this color)
#288FD7
oklch(62.7% 0.141 244.7)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
Step 700
700
#0066A1
oklch(49.2% 0.123 244.5)
-
Step 800
800
#005385
oklch(42.7% 0.107 244.8)
-
Step 900
900
#04456F
oklch(37.7% 0.093 245.1)
-
Step 950
950
#082941
oklch(27.1% 0.058 244.7)
#288FD7 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) | #6D92DA | 0.060 |
| Deuteranopia (no green cones) | #5482D6 | 0.043 |
| Tritanopia (no blue cones) | #00A1A9 | 0.099 |
| Achromatopsia (no color) | #898989 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288FD7
#288FD7
oklch(62.7% 0.141 244.7)
- #C17300
#C17300
oklch(62.7% 0.141 64.9)
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 #288FD7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.028
- Water Blue #0E87CC ΔE 0.029
- Chefchaouen Blue #4895EF ΔE 0.045
- Cool Blue #4984B8 ΔE 0.051
- Steel Blue #4682B4 ΔE 0.057
- Blue NCS #118AB2 ΔE 0.058
- Dodger Blue #1E90FF ΔE 0.060
- Faded Blue #658CBB ΔE 0.060
Use #288FD7 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.