#5B55DB
Closest named color: Warm Blue (#4B57DB). oklch(53.4% 0.198 279.3), rgb(91, 85, 219).
Aa
White text reads best on this color (5.57:1).
About this color
#5B55DB is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.198 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.022 away. White text reads best on it, at 5.57:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.198) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.76:1 |
| White text | 5.57:1 |
Values
| HEX | #5B55DB |
| RGB | rgb(91, 85, 219) |
| HSL | hsl(243, 65%, 60%) |
| OKLCH | oklch(53.4% 0.198 279.3) |
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 #5B55DB | 5.57:1 | AA | Lc -82.7 | Fine for body text |
| Black text on #5B55DB | 3.76:1 | AA large text | Lc 26.7 | Dividers and decoration only |
| #5B55DB text on white | 5.57:1 | AA | Lc 77.4 | Fine for body text |
| #5B55DB text on black | 3.76:1 | AA large text | Lc -24.4 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E6E8FB
oklch(93.5% 0.026 281.1)
-
Step 200
200
#D2D6FA
oklch(88.4% 0.05 280.3)
-
Step 300
300
#B4BBFA
oklch(80.9% 0.089 279.3)
-
Step 400
400
#8F95F7
oklch(70.7% 0.142 279.4)
-
Step 500
500
#7677F4
oklch(63.1% 0.183 279.4)
-
Step 600
600 (this color)
#5B55DB
oklch(53.4% 0.198 279.3)
-
Step 700
700
#514BC5
oklch(49.2% 0.184 279.4)
-
Step 800
800
#423E9F
oklch(42.7% 0.152 279.6)
-
Step 900
900
#37367E
oklch(37.6% 0.119 279.7)
-
Step 950
950
#20204A
oklch(26.9% 0.076 280)
#5B55DB 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) | #006DDF | 0.079 |
| Deuteranopia (no green cones) | #0063D8 | 0.073 |
| Tritanopia (no blue cones) | #007690 | 0.170 |
| Achromatopsia (no color) | #686868 | 0.199 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B55DB
#5B55DB
oklch(53.4% 0.198 279.3)
- #7D6D00
#7D6D00
oklch(53.4% 0.111 99.1)
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 #5B55DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.022
- Dark Periwinkle #665FD1 ΔE 0.034
- Slate Blue #6A5ACD ΔE 0.035
- Light Indigo #6D5ACF ΔE 0.037
- Iris #6258C4 ΔE 0.038
- Neon Blue #4361EE ΔE 0.046
- Royal Blue #4169E1 ΔE 0.052
- Bluey Purple #6241C7 ΔE 0.052
Use #5B55DB 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.