#528FE4
Closest named color: Dark Sky Blue (#448EE4). oklch(64.8% 0.143 257), rgb(82, 143, 228).
Aa
Black text reads best on this color (6.40:1).
About this color
#528FE4 is a medium-light, vivid blue. In OKLCH its lightness is 65%, its chroma 0.143 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.013 away. Black text reads best on it, at 6.40:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.40:1 |
| White text | 3.27:1 |
Values
| HEX | #528FE4 |
| RGB | rgb(82, 143, 228) |
| HSL | hsl(215, 73%, 61%) |
| OKLCH | oklch(64.8% 0.143 257) |
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 #528FE4 | 3.27:1 | AA large text | Lc -65.3 | Content text, not long reading |
| Black text on #528FE4 | 6.40:1 | AA | Lc 44.2 | Non-text elements, placeholder text |
| #528FE4 text on white | 3.27:1 | AA large text | Lc 59.9 | Large or bold text, headings |
| #528FE4 text on black | 6.40:1 | AA | Lc -41.9 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF8
oklch(93.7% 0.02 257.5)
-
Step 200
200
#C9DBF3
oklch(88.5% 0.038 255.6)
-
Step 300
300
#A4C3EE
oklch(80.9% 0.07 256.6)
-
Step 400
400
#73A2E6
oklch(70.7% 0.112 257.6)
-
Step 500
500 (this color)
#528FE4
oklch(64.8% 0.143 257)
-
Step 600
600
#2F72CC
oklch(55.7% 0.155 257)
-
Step 700
700
#215FB0
oklch(49.1% 0.144 256.8)
-
Step 800
800
#1D4E8F
oklch(42.8% 0.12 256.8)
-
Step 900
900
#1E4172
oklch(37.6% 0.093 257.3)
-
Step 950
950
#122743
oklch(27.1% 0.059 256.2)
#528FE4 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) | #6A95E7 | 0.032 |
| Deuteranopia (no green cones) | #5588E2 | 0.018 |
| Tritanopia (no blue cones) | #00A2AF | 0.115 |
| Achromatopsia (no color) | #8E8E8E | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #528FE4
#528FE4
oklch(64.8% 0.143 257)
- #BC8200
#BC8200
oklch(64.9% 0.136 77.3)
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 #528FE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.013
- Chefchaouen Blue #4895EF ΔE 0.021
- Soft Blue #6488EA ΔE 0.027
- Cornflower Blue #6495ED ΔE 0.028
- Dodger Blue #1E90FF ΔE 0.049
- Water Blue #0E87CC ΔE 0.061
- Faded Blue #658CBB ΔE 0.062
- Cornflower #6A79F7 ΔE 0.069
Use #528FE4 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.