#5B57EE
Closest named color: Neon Blue (#4361EE). oklch(55.3% 0.22 277.6), rgb(91, 87, 238).
Aa
White text reads best on this color (5.19:1).
About this color
#5B57EE is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.220 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.033 away. White text reads best on it, at 5.19:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.220) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.04:1 |
| White text | 5.19:1 |
Values
| HEX | #5B57EE |
| RGB | rgb(91, 87, 238) |
| HSL | hsl(242, 82%, 64%) |
| OKLCH | oklch(55.3% 0.22 277.6) |
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 #5B57EE | 5.19:1 | AA | Lc -80.5 | Fine for body text |
| Black text on #5B57EE | 4.04:1 | AA large text | Lc 28.9 | Dividers and decoration only |
| #5B57EE text on white | 5.19:1 | AA | Lc 75.2 | Fine for body text |
| #5B57EE text on black | 4.04:1 | AA large text | Lc -26.6 | Dividers and decoration only |
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 600.
-
Step 50
50
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E5E9FD
oklch(93.7% 0.027 276.8)
-
Step 200
200
#D0D6FE
oklch(88.4% 0.055 278.5)
-
Step 300
300
#B1BBFF
oklch(80.9% 0.097 277.5)
-
Step 400
400
#8A95FF
oklch(70.7% 0.154 277.2)
-
Step 500
500
#7175FF
oklch(63.1% 0.201 277.7)
-
Step 600
600 (this color)
#5B57EE
oklch(55.3% 0.22 277.6)
-
Step 700
700
#4C47D0
oklch(49.1% 0.204 277.4)
-
Step 800
800
#3E3BA8
oklch(42.6% 0.169 277.6)
-
Step 900
900
#343585
oklch(37.8% 0.131 277.6)
-
Step 950
950
#1E204E
oklch(27.1% 0.083 277.4)
#5B57EE 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) | #0073F3 | 0.080 |
| Deuteranopia (no green cones) | #0066EB | 0.069 |
| Tritanopia (no blue cones) | #007D9B | 0.182 |
| Achromatopsia (no color) | #6D6D6D | 0.221 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B57EE
#5B57EE
oklch(55.3% 0.22 277.6)
- #857200
#857200
oklch(55.3% 0.114 97.5)
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 #5B57EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.033
- Warm Blue #4B57DB ΔE 0.036
- Royal Blue #4169E1 ΔE 0.051
- Dark Periwinkle #665FD1 ΔE 0.052
- Light Indigo #6D5ACF ΔE 0.056
- Slate Blue #6A5ACD ΔE 0.056
- Azul #1D5DEC ΔE 0.060
- Purpley Blue #5F34E7 ΔE 0.063
Use #5B57EE 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.