#505DBB
Closest named color: Iris (#6258C4). oklch(51.7% 0.147 274.2), rgb(80, 93, 187).
Aa
White text reads best on this color (5.79:1).
About this color
#505DBB is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.147 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.031 away. White text reads best on it, at 5.79:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.62:1 |
| White text | 5.79:1 |
Values
| HEX | #505DBB |
| RGB | rgb(80, 93, 187) |
| HSL | hsl(233, 44%, 52%) |
| OKLCH | oklch(51.7% 0.147 274.2) |
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 #505DBB | 5.79:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #505DBB | 3.62:1 | AA large text | Lc 25.3 | Dividers and decoration only |
| #505DBB text on white | 5.79:1 | AA | Lc 78.7 | Fine for body text |
| #505DBB text on black | 3.62:1 | AA large text | Lc -23.1 | 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 700.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D1D8F4
oklch(88.6% 0.039 274.4)
-
Step 300
300
#B2BEEF
oklch(80.9% 0.071 274)
-
Step 400
400
#8B9BE7
oklch(70.7% 0.113 274.1)
-
Step 500
500
#6F80E0
oklch(63.1% 0.145 273.9)
-
Step 600
600
#5967CE
oklch(55.6% 0.158 274.3)
-
Step 700
700 (this color)
#505DBB
oklch(51.7% 0.147 274.2)
-
Step 800
800
#3C4690
oklch(42.6% 0.121 274.3)
-
Step 900
900
#333C73
oklch(37.8% 0.094 274)
-
Step 950
950
#1E2343
oklch(26.9% 0.06 275)
#505DBB 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) | #2C6ABE | 0.045 |
| Deuteranopia (no green cones) | #1A61B9 | 0.050 |
| Tritanopia (no blue cones) | #0B7283 | 0.130 |
| Achromatopsia (no color) | #656565 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #505DBB
#505DBB
oklch(51.7% 0.147 274.2)
- #7C6600
#7C6600
oklch(51.7% 0.106 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 #505DBB, closest first.
No curated palette has a color within ΔE 0.04 of #505DBB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.031
- Dark Periwinkle #665FD1 ΔE 0.047
- Slate Blue #6A5ACD ΔE 0.048
- French Blue #436BAD ΔE 0.048
- Mid Blue #276AB3 ΔE 0.052
- Warm Blue #4B57DB ΔE 0.053
- Light Indigo #6D5ACF ΔE 0.053
- Royal Blue #4169E1 ΔE 0.064
Use #505DBB 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.