#515DDB
Closest named color: Warm Blue (#4B57DB). oklch(54.1% 0.191 274), rgb(81, 93, 219).
Aa
White text reads best on this color (5.33:1).
About this color
#515DDB is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.191 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.017 away. White text reads best on it, at 5.33:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.191) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.93:1 |
| White text | 5.33:1 |
Values
| HEX | #515DDB |
| RGB | rgb(81, 93, 219) |
| HSL | hsl(235, 66%, 59%) |
| OKLCH | oklch(54.1% 0.191 274) |
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 #515DDB | 5.33:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #515DDB | 3.93:1 | AA large text | Lc 28.0 | Dividers and decoration only |
| #515DDB text on white | 5.33:1 | AA | Lc 76.1 | Fine for body text |
| #515DDB text on black | 3.93:1 | AA large text | Lc -25.6 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CFD8F9
oklch(88.6% 0.047 273.4)
-
Step 300
300
#AFBDF9
oklch(80.9% 0.086 274.1)
-
Step 400
400
#8799F5
oklch(70.8% 0.136 274)
-
Step 500
500
#6B7CF2
oklch(63.1% 0.176 274.1)
-
Step 600
600 (this color)
#515DDB
oklch(54.1% 0.191 274)
-
Step 700
700
#4650C3
oklch(49.2% 0.177 274.1)
-
Step 800
800
#39429D
oklch(42.6% 0.146 274.1)
-
Step 900
900
#30397D
oklch(37.6% 0.115 273.9)
-
Step 950
950
#1C2249
oklch(27% 0.072 274)
#515DDB 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) | #0071DF | 0.064 |
| Deuteranopia (no green cones) | #0065D8 | 0.056 |
| Tritanopia (no blue cones) | #007C93 | 0.160 |
| Achromatopsia (no color) | #6B6B6B | 0.191 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515DDB
#515DDB
oklch(54.1% 0.191 274)
- #846D00
#846D00
oklch(54.1% 0.111 94.3)
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 #515DDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.017
- Royal Blue #4169E1 ΔE 0.031
- Neon Blue #4361EE ΔE 0.033
- Dark Periwinkle #665FD1 ΔE 0.034
- Slate Blue #6A5ACD ΔE 0.041
- Iris #6258C4 ΔE 0.043
- Light Indigo #6D5ACF ΔE 0.044
- Azul #1D5DEC ΔE 0.053
Use #515DDB 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.