#5B57DB
Closest named color: Warm Blue (#4B57DB). oklch(53.7% 0.196 278.9), rgb(91, 87, 219).
Aa
White text reads best on this color (5.48:1).
About this color
#5B57DB is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.196 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 5.48:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.196) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.83:1 |
| White text | 5.48:1 |
Values
| HEX | #5B57DB |
| RGB | rgb(91, 87, 219) |
| HSL | hsl(242, 65%, 60%) |
| OKLCH | oklch(53.7% 0.196 278.9) |
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 #5B57DB | 5.48:1 | AA | Lc -82.2 | Fine for body text |
| Black text on #5B57DB | 3.83:1 | AA large text | Lc 27.2 | Dividers and decoration only |
| #5B57DB text on white | 5.48:1 | AA | Lc 76.9 | Fine for body text |
| #5B57DB text on black | 3.83:1 | AA large text | Lc -24.8 | 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
#E6E9FB
oklch(93.7% 0.024 278.4)
-
Step 200
200
#D1D7FA
oklch(88.6% 0.049 277.7)
-
Step 300
300
#B4BBF9
oklch(80.9% 0.088 279.2)
-
Step 400
400
#8E96F7
oklch(70.8% 0.141 278.6)
-
Step 500
500
#7578F3
oklch(63.1% 0.18 278.8)
-
Step 600
600 (this color)
#5B57DB
oklch(53.7% 0.196 278.9)
-
Step 700
700
#504CC4
oklch(49.2% 0.182 278.9)
-
Step 800
800
#413F9E
oklch(42.7% 0.15 278.9)
-
Step 900
900
#36377E
oklch(37.8% 0.117 278.6)
-
Step 950
950
#1F214A
oklch(27.1% 0.075 278.1)
#5B57DB 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) | #006EDF | 0.077 |
| Deuteranopia (no green cones) | #0064D8 | 0.072 |
| Tritanopia (no blue cones) | #007791 | 0.168 |
| Achromatopsia (no color) | #696969 | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B57DB
#5B57DB
oklch(53.7% 0.196 278.9)
- #7E6E00
#7E6E00
oklch(53.7% 0.111 99.2)
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 #5B57DB, 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 0.031
- Slate Blue #6A5ACD ΔE 0.033
- Light Indigo #6D5ACF ΔE 0.035
- Iris #6258C4 ΔE 0.037
- Neon Blue #4361EE ΔE 0.044
- Royal Blue #4169E1 ΔE 0.048
- Bluey Purple #6241C7 ΔE 0.055
Use #5B57DB 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.