#538DF0
Closest named color: Soft Blue (#6488EA). oklch(65.1% 0.16 260.4), rgb(83, 141, 240).
Aa
Black text reads best on this color (6.43:1).
About this color
#538DF0 is a medium-light, vivid blue. In OKLCH its lightness is 65%, its chroma 0.160 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.020 away. Black text reads best on it, at 6.43:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 6.43:1 |
| White text | 3.26:1 |
Values
| HEX | #538DF0 |
| RGB | rgb(83, 141, 240) |
| HSL | hsl(218, 84%, 63%) |
| OKLCH | oklch(65.1% 0.16 260.4) |
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 #538DF0 | 3.26:1 | AA large text | Lc -65.1 | Content text, not long reading |
| Black text on #538DF0 | 6.43:1 | AA | Lc 44.4 | Non-text elements, placeholder text |
| #538DF0 text on white | 3.26:1 | AA large text | Lc 59.7 | Large or bold text, headings |
| #538DF0 text on black | 6.43:1 | AA | Lc -42.1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C9DAF7
oklch(88.5% 0.044 261.2)
-
Step 300
300
#A4C2F4
oklch(81% 0.078 260.5)
-
Step 400
400
#72A0EE
oklch(70.6% 0.125 260.5)
-
Step 500
500 (this color)
#538DF0
oklch(65.1% 0.16 260.4)
-
Step 600
600
#306ED7
oklch(55.6% 0.174 260.3)
-
Step 700
700
#235BBB
oklch(49.1% 0.163 260.5)
-
Step 800
800
#1E4B97
oklch(42.7% 0.134 260.3)
-
Step 900
900
#1E3F78
oklch(37.6% 0.105 260.5)
-
Step 950
950
#122646
oklch(27.1% 0.065 259.4)
#538DF0 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) | #5F96F4 | 0.028 |
| Deuteranopia (no green cones) | #4788EE | 0.018 |
| Tritanopia (no blue cones) | #00A4B3 | 0.131 |
| Achromatopsia (no color) | #8E8E8E | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #538DF0
#538DF0
oklch(65.1% 0.16 260.4)
- #BA8500
#BA8500
oklch(65.2% 0.135 80.4)
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 #538DF0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.020
- Chefchaouen Blue #4895EF ΔE 0.022
- Dark Sky Blue #448EE4 ΔE 0.023
- Cornflower Blue #6495ED ΔE 0.030
- Dodger Blue #1E90FF ΔE 0.037
- Cornflower #6A79F7 ΔE 0.055
- Lavender Blue #8B88F8 ΔE 0.068
- Clear Blue #247AFD ΔE 0.069
Use #538DF0 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.