#515FE8
Closest named color: Neon Blue (#4361EE). oklch(55.5% 0.205 273.2), rgb(81, 95, 232).
Aa
White text reads best on this color (5.05:1).
About this color
#515FE8 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.205 and its hue 273°. 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 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.205) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #515FE8 |
| RGB | rgb(81, 95, 232) |
| HSL | hsl(234, 77%, 61%) |
| OKLCH | oklch(55.5% 0.205 273.2) |
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 #515FE8 | 5.05:1 | AA | Lc -79.8 | Fine for body text |
| Black text on #515FE8 | 4.15:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #515FE8 text on white | 5.05:1 | AA | Lc 74.4 | Content text, not long reading |
| #515FE8 text on black | 4.15:1 | AA large text | Lc -27.3 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CED8FC
oklch(88.6% 0.051 273.1)
-
Step 300
300
#ADBDFD
oklch(80.9% 0.092 273.3)
-
Step 400
400
#8398FC
oklch(70.7% 0.148 273.1)
-
Step 500
500
#677AF9
oklch(63% 0.189 273.3)
-
Step 600
600 (this color)
#515FE8
oklch(55.5% 0.205 273.2)
-
Step 700
700
#434ECA
oklch(49.2% 0.19 273.3)
-
Step 800
800
#3641A3
oklch(42.7% 0.157 272.9)
-
Step 900
900
#2E3882
oklch(37.7% 0.124 273.1)
-
Step 950
950
#1B224C
oklch(27.1% 0.078 273)
#515FE8 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) | #0075ED | 0.064 |
| Deuteranopia (no green cones) | #0068E5 | 0.054 |
| Tritanopia (no blue cones) | #00819A | 0.170 |
| Achromatopsia (no color) | #6F6F6F | 0.206 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515FE8
#515FE8
oklch(55.5% 0.205 273.2)
- #8A7000
#8A7000
oklch(55.4% 0.113 92.7)
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 #515FE8, 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 0.029
- Royal Blue #4169E1 ΔE 0.029
- Dark Periwinkle #665FD1 ΔE 0.045
- Azul #1D5DEC ΔE 0.048
- Slate Blue #6A5ACD ΔE 0.054
- Light Indigo #6D5ACF ΔE 0.055
- Cerulean Blue #056EEE ΔE 0.055
Use #515FE8 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.