#528BD9
Closest named color: Dark Sky Blue (#448EE4). oklch(63.3% 0.133 256.7), rgb(82, 139, 217).
Aa
Black text reads best on this color (6.05:1).
About this color
#528BD9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.133 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.019 away. Black text reads best on it, at 6.05:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.05:1 |
| White text | 3.46:1 |
Values
| HEX | #528BD9 |
| RGB | rgb(82, 139, 217) |
| HSL | hsl(215, 64%, 59%) |
| OKLCH | oklch(63.3% 0.133 256.7) |
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 #528BD9 | 3.46:1 | AA large text | Lc -67.5 | Content text, not long reading |
| Black text on #528BD9 | 6.05:1 | AA | Lc 42.1 | Non-text elements, placeholder text |
| #528BD9 text on white | 3.46:1 | AA large text | Lc 62.0 | Content text, not long reading |
| #528BD9 text on black | 6.05:1 | AA | Lc -39.7 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADBF1
oklch(88.6% 0.035 254.9)
-
Step 300
300
#A6C3EB
oklch(80.9% 0.065 256.5)
-
Step 400
400
#76A3E1
oklch(70.8% 0.104 256.6)
-
Step 500
500 (this color)
#528BD9
oklch(63.3% 0.133 256.7)
-
Step 600
600
#3473C6
oklch(55.7% 0.144 256.4)
-
Step 700
700
#2760AB
oklch(49.2% 0.134 256.6)
-
Step 800
800
#224E8A
oklch(42.6% 0.111 257)
-
Step 900
900
#21426F
oklch(37.8% 0.087 256.7)
-
Step 950
950
#142741
oklch(27.1% 0.055 256.6)
#528BD9 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) | #6991DC | 0.031 |
| Deuteranopia (no green cones) | #5784D7 | 0.018 |
| Tritanopia (no blue cones) | #009DA8 | 0.110 |
| Achromatopsia (no color) | #8A8A8A | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #528BD9
#528BD9
oklch(63.3% 0.133 256.7)
- #B77D00
#B77D00
oklch(63.3% 0.133 76.3)
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 #528BD9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.019
- Soft Blue #6488EA ΔE 0.034
- Chefchaouen Blue #4895EF ΔE 0.038
- Cornflower Blue #6495ED ΔE 0.044
- Water Blue #0E87CC ΔE 0.049
- Faded Blue #658CBB ΔE 0.049
- Cool Blue #4984B8 ΔE 0.053
- Steel Blue #4682B4 ΔE 0.060
Use #528BD9 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.