#538CE7
Closest named color: Dark Sky Blue (#448EE4). oklch(64.4% 0.15 259.4), rgb(83, 140, 231).
Aa
Black text reads best on this color (6.27:1).
About this color
#538CE7 is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.150 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.014 away. Black text reads best on it, at 6.27:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.27:1 |
| White text | 3.34:1 |
Values
| HEX | #538CE7 |
| RGB | rgb(83, 140, 231) |
| HSL | hsl(217, 76%, 62%) |
| OKLCH | oklch(64.4% 0.15 259.4) |
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 #538CE7 | 3.34:1 | AA large text | Lc -66.1 | Content text, not long reading |
| Black text on #538CE7 | 6.27:1 | AA | Lc 43.4 | Non-text elements, placeholder text |
| #538CE7 text on white | 3.34:1 | AA large text | Lc 60.7 | Content text, not long reading |
| #538CE7 text on black | 6.27:1 | AA | Lc -41.1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF8
oklch(93.7% 0.02 257.5)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A5C2F0
oklch(80.9% 0.073 259.5)
-
Step 400
400
#74A1E9
oklch(70.6% 0.117 259.5)
-
Step 500
500 (this color)
#538CE7
oklch(64.4% 0.15 259.4)
-
Step 600
600
#3270D1
oklch(55.7% 0.163 259.2)
-
Step 700
700
#255DB5
oklch(49.2% 0.152 259.4)
-
Step 800
800
#204C92
oklch(42.6% 0.125 259.4)
-
Step 900
900
#1F4074
oklch(37.6% 0.097 259.2)
-
Step 950
950
#132644
oklch(27% 0.061 259.2)
#538CE7 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) | #6394EB | 0.029 |
| Deuteranopia (no green cones) | #4E86E5 | 0.017 |
| Tritanopia (no blue cones) | #00A1AE | 0.124 |
| Achromatopsia (no color) | #8C8C8C | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #538CE7
#538CE7
oklch(64.4% 0.15 259.4)
- #B88200
#B88200
oklch(64.4% 0.134 79.3)
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 #538CE7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.014
- Soft Blue #6488EA ΔE 0.020
- Chefchaouen Blue #4895EF ΔE 0.025
- Cornflower Blue #6495ED ΔE 0.032
- Dodger Blue #1E90FF ΔE 0.045
- Cornflower #6A79F7 ΔE 0.060
- Water Blue #0E87CC ΔE 0.062
- Faded Blue #658CBB ΔE 0.068
Use #538CE7 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.