#528FE9
Closest named color: Dark Sky Blue (#448EE4). oklch(65.1% 0.149 258.1), rgb(82, 143, 233).
Aa
Black text reads best on this color (6.46:1).
About this color
#528FE9 is a medium-light, vivid blue. In OKLCH its lightness is 65%, its chroma 0.149 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.015 away. Black text reads best on it, at 6.46:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.46:1 |
| White text | 3.24:1 |
Values
| HEX | #528FE9 |
| RGB | rgb(82, 143, 233) |
| HSL | hsl(216, 77%, 62%) |
| OKLCH | oklch(65.1% 0.149 258.1) |
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 #528FE9 | 3.24:1 | AA large text | Lc -64.9 | Content text, not long reading |
| Black text on #528FE9 | 6.46:1 | AA | Lc 44.6 | Non-text elements, placeholder text |
| #528FE9 text on white | 3.24:1 | AA large text | Lc 59.5 | Large or bold text, headings |
| #528FE9 text on black | 6.46:1 | AA | Lc -42.2 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DBF4
oklch(88.6% 0.04 256.6)
-
Step 300
300
#A4C3F0
oklch(81% 0.072 257.6)
-
Step 400
400
#72A2E9
oklch(70.7% 0.117 258)
-
Step 500
500 (this color)
#528FE9
oklch(65.1% 0.149 258.1)
-
Step 600
600
#2E70D0
oklch(55.5% 0.163 258.2)
-
Step 700
700
#205EB4
oklch(49.2% 0.15 257.8)
-
Step 800
800
#1D4D92
oklch(42.7% 0.125 258.1)
-
Step 900
900
#1D4174
oklch(37.7% 0.097 257.5)
-
Step 950
950
#122644
oklch(26.9% 0.062 258.3)
#528FE9 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) | #6796ED | 0.031 |
| Deuteranopia (no green cones) | #5188E7 | 0.019 |
| Tritanopia (no blue cones) | #00A4B1 | 0.122 |
| Achromatopsia (no color) | #8F8F8F | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #528FE9
#528FE9
oklch(65.1% 0.149 258.1)
- #BC8300
#BC8300
oklch(65.1% 0.136 78)
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 #528FE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.015
- Chefchaouen Blue #4895EF ΔE 0.017
- Soft Blue #6488EA ΔE 0.024
- Cornflower Blue #6495ED ΔE 0.026
- Dodger Blue #1E90FF ΔE 0.043
- Cornflower #6A79F7 ΔE 0.065
- Water Blue #0E87CC ΔE 0.066
- Faded Blue #658CBB ΔE 0.070
Use #528FE9 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.