#5B5BE5
Closest named color: Warm Blue (#4B57DB). oklch(55.2% 0.204 277.4), rgb(91, 91, 229).
Aa
White text reads best on this color (5.15:1).
About this color
#5B5BE5 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.204 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.029 away. White text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.204) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 4.07:1 |
| White text | 5.15:1 |
Values
| HEX | #5B5BE5 |
| RGB | rgb(91, 91, 229) |
| HSL | hsl(240, 73%, 63%) |
| OKLCH | oklch(55.2% 0.204 277.4) |
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 #5B5BE5 | 5.15:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #5B5BE5 | 4.07:1 | AA large text | Lc 29.0 | Dividers and decoration only |
| #5B5BE5 text on white | 5.15:1 | AA | Lc 75.0 | Fine for body text |
| #5B5BE5 text on black | 4.07:1 | AA large text | Lc -26.7 | 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
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#D0D7FB
oklch(88.5% 0.05 276.6)
-
Step 300
300
#B2BBFC
oklch(80.8% 0.092 278)
-
Step 400
400
#8B96FA
oklch(70.7% 0.146 277.2)
-
Step 500
500
#7178F8
oklch(63.2% 0.188 277.2)
-
Step 600
600 (this color)
#5B5BE5
oklch(55.2% 0.204 277.4)
-
Step 700
700
#4C4BC8
oklch(49.1% 0.189 277.2)
-
Step 800
800
#3E3EA2
oklch(42.6% 0.157 277.4)
-
Step 900
900
#343680
oklch(37.6% 0.122 277.6)
-
Step 950
950
#1E214B
oklch(27.1% 0.077 276.9)
#5B5BE5 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) | #0073EA | 0.076 |
| Deuteranopia (no green cones) | #0067E2 | 0.068 |
| Tritanopia (no blue cones) | #007D97 | 0.174 |
| Achromatopsia (no color) | #6D6D6D | 0.204 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B5BE5
#5B5BE5
oklch(55.2% 0.204 277.4)
- #857200
#857200
oklch(55.3% 0.114 97.5)
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 #5B5BE5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.029
- Neon Blue #4361EE ΔE 0.032
- Dark Periwinkle #665FD1 ΔE 0.037
- Royal Blue #4169E1 ΔE 0.041
- Slate Blue #6A5ACD ΔE 0.043
- Light Indigo #6D5ACF ΔE 0.043
- Iris #6258C4 ΔE 0.052
- Medium Slate Blue #7B68EE ΔE 0.060
Use #5B5BE5 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.