#515CEE
Closest named color: Neon Blue (#4361EE). oklch(55.4% 0.216 273.7), rgb(81, 92, 238).
Aa
White text reads best on this color (5.10:1).
About this color
#515CEE is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.216 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.018 away. White text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.216) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.11:1 |
| White text | 5.10:1 |
Values
| HEX | #515CEE |
| RGB | rgb(81, 92, 238) |
| HSL | hsl(236, 82%, 63%) |
| OKLCH | oklch(55.4% 0.216 273.7) |
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 #515CEE | 5.10:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #515CEE | 4.11:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #515CEE text on white | 5.10:1 | AA | Lc 74.6 | Content text, not long reading |
| #515CEE text on black | 4.11:1 | AA large text | Lc -27.1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CDD7FE
oklch(88.4% 0.055 273.9)
-
Step 300
300
#ADBDFF
oklch(81% 0.095 273.6)
-
Step 400
400
#8397FF
oklch(70.7% 0.153 273.6)
-
Step 500
500
#6778FF
oklch(63% 0.199 273.8)
-
Step 600
600 (this color)
#515CEE
oklch(55.4% 0.216 273.7)
-
Step 700
700
#434BD0
oklch(49.2% 0.201 273.6)
-
Step 800
800
#373EA8
oklch(42.7% 0.167 274)
-
Step 900
900
#2E3785
oklch(37.7% 0.13 273.5)
-
Step 950
950
#1B214E
oklch(27.1% 0.082 273.9)
#515CEE 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) | #0075F3 | 0.068 |
| Deuteranopia (no green cones) | #0067EB | 0.054 |
| Tritanopia (no blue cones) | #00819C | 0.178 |
| Achromatopsia (no color) | #6E6E6E | 0.217 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515CEE
#515CEE
oklch(55.4% 0.216 273.7)
- #897100
#897100
oklch(55.5% 0.114 94.1)
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 #515CEE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.018
- Warm Blue #4B57DB ΔE 0.033
- Royal Blue #4169E1 ΔE 0.038
- Azul #1D5DEC ΔE 0.047
- Dark Periwinkle #665FD1 ΔE 0.054
- Bright Blue #0165FC ΔE 0.055
- Cerulean Blue #056EEE ΔE 0.058
- Slate Blue #6A5ACD ΔE 0.061
Use #515CEE 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.