#538EF9
Closest named color: Chefchaouen Blue (#4895EF). oklch(65.9% 0.171 261.3), rgb(83, 142, 249).
Aa
Black text reads best on this color (6.60:1).
About this color
#538EF9 is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.171 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.027 away. Black text reads best on it, at 6.60:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 6.60:1 |
| White text | 3.17:1 |
Values
| HEX | #538EF9 |
| RGB | rgb(83, 142, 249) |
| HSL | hsl(219, 93%, 65%) |
| OKLCH | oklch(65.9% 0.171 261.3) |
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 #538EF9 | 3.17:1 | AA large text | Lc -64.0 | Content text, not long reading |
| Black text on #538EF9 | 6.60:1 | AA | Lc 45.4 | Large or bold text, headings |
| #538EF9 text on white | 3.17:1 | AA large text | Lc 58.6 | Large or bold text, headings |
| #538EF9 text on black | 6.60:1 | AA | Lc -43.1 | 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
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAF9
oklch(88.5% 0.047 261.4)
-
Step 300
300
#A3C2F7
oklch(81% 0.083 261)
-
Step 400
400
#70A0F4
oklch(70.8% 0.134 261)
-
Step 500
500 (this color)
#538EF9
oklch(65.9% 0.171 261.3)
-
Step 600
600
#2E6CDE
oklch(55.6% 0.186 261.3)
-
Step 700
700
#2159C1
oklch(49.1% 0.174 261.4)
-
Step 800
800
#1D4A9C
oklch(42.8% 0.143 261.2)
-
Step 900
900
#1D3E7C
oklch(37.6% 0.112 261.6)
-
Step 950
950
#122548
oklch(27% 0.07 261.5)
#538EF9 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) | #5B99FD | 0.031 |
| Deuteranopia (no green cones) | #3E89F7 | 0.024 |
| Tritanopia (no blue cones) | #00A7B7 | 0.140 |
| Achromatopsia (no color) | #909090 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #538EF9
#538EF9
oklch(65.9% 0.171 261.3)
- #BC8800
#BC8800
oklch(66% 0.136 81.4)
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 #538EF9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.027
- Soft Blue #6488EA ΔE 0.028
- Dodger Blue #1E90FF ΔE 0.032
- Cornflower Blue #6495ED ΔE 0.034
- Dark Sky Blue #448EE4 ΔE 0.035
- Cornflower #6A79F7 ΔE 0.054
- Lavender Blue #8B88F8 ΔE 0.065
- Clear Blue #247AFD ΔE 0.067
Use #538EF9 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.