#505FCF
Closest named color: Warm Blue (#4B57DB). oklch(53.5% 0.172 273.4), rgb(80, 95, 207).
Aa
White text reads best on this color (5.41:1).
About this color
#505FCF is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.172 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.028 away. White text reads best on it, at 5.41:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.172) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.87:1 |
| White text | 5.41:1 |
Values
| HEX | #505FCF |
| RGB | rgb(80, 95, 207) |
| HSL | hsl(233, 57%, 56%) |
| OKLCH | oklch(53.5% 0.172 273.4) |
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 #505FCF | 5.41:1 | AA | Lc -82.0 | Fine for body text |
| Black text on #505FCF | 3.87:1 | AA large text | Lc 27.4 | Dividers and decoration only |
| #505FCF text on white | 5.41:1 | AA | Lc 76.6 | Fine for body text |
| #505FCF text on black | 3.87:1 | AA large text | Lc -25.1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#CFD8F6
oklch(88.5% 0.042 272.3)
-
Step 300
300
#B0BEF3
oklch(80.9% 0.077 273.1)
-
Step 400
400
#889AEE
oklch(70.7% 0.125 273.6)
-
Step 500
500
#6C7FE8
oklch(63.2% 0.158 273.3)
-
Step 600
600 (this color)
#505FCF
oklch(53.5% 0.172 273.4)
-
Step 700
700
#4654BA
oklch(49.2% 0.16 273.2)
-
Step 800
800
#394596
oklch(42.7% 0.132 273.1)
-
Step 900
900
#313B78
oklch(37.8% 0.104 273.4)
-
Step 950
950
#1C2346
oklch(27% 0.065 272.8)
#505FCF 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) | #0F70D3 | 0.058 |
| Deuteranopia (no green cones) | #0065CD | 0.055 |
| Tritanopia (no blue cones) | #00798E | 0.146 |
| Achromatopsia (no color) | #6A6A6A | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #505FCF
#505FCF
oklch(53.5% 0.172 273.4)
- #836B00
#836B00
oklch(53.5% 0.11 93.3)
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 #505FCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.028
- Dark Periwinkle #665FD1 ΔE 0.031
- Iris #6258C4 ΔE 0.032
- Royal Blue #4169E1 ΔE 0.037
- Slate Blue #6A5ACD ΔE 0.037
- Light Indigo #6D5ACF ΔE 0.042
- Neon Blue #4361EE ΔE 0.049
- Azul #1D5DEC ΔE 0.064
Use #505FCF 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.