#5A5FCB
Closest named color: Dark Periwinkle (#665FD1). oklch(53.9% 0.164 277.4), rgb(90, 95, 203).
Aa
White text reads best on this color (5.33:1).
About this color
#5A5FCB is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.164 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.020 away. White text reads best on it, at 5.33:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 3.93:1 |
| White text | 5.33:1 |
Values
| HEX | #5A5FCB |
| RGB | rgb(90, 95, 203) |
| HSL | hsl(237, 52%, 57%) |
| OKLCH | oklch(53.9% 0.164 277.4) |
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 #5A5FCB | 5.33:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #5A5FCB | 3.93:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #5A5FCB text on white | 5.33:1 | AA | Lc 76.3 | Fine for body text |
| #5A5FCB text on black | 3.93:1 | AA large text | Lc -25.5 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D2D7F5
oklch(88.5% 0.042 278)
-
Step 300
300
#B4BDF1
oklch(80.9% 0.074 277)
-
Step 400
400
#8F99EA
oklch(70.8% 0.119 277.5)
-
Step 500
500
#757DE3
oklch(63.1% 0.152 277.7)
-
Step 600
600 (this color)
#5A5FCB
oklch(53.9% 0.164 277.4)
-
Step 700
700
#4E52B5
oklch(49% 0.154 277.4)
-
Step 800
800
#404492
oklch(42.7% 0.126 277.4)
-
Step 900
900
#363A75
oklch(37.7% 0.099 277.6)
-
Step 950
950
#1F2244
oklch(26.8% 0.063 277.5)
#5A5FCB 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) | #1F70CF | 0.063 |
| Deuteranopia (no green cones) | #0066C9 | 0.068 |
| Tritanopia (no blue cones) | #1E788C | 0.144 |
| Achromatopsia (no color) | #6B6B6B | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5A5FCB
#5A5FCB
oklch(53.9% 0.164 277.4)
- #806E00
#806E00
oklch(53.9% 0.111 97.8)
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 #5A5FCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.020
- Iris #6258C4 ΔE 0.021
- Slate Blue #6A5ACD ΔE 0.025
- Light Indigo #6D5ACF ΔE 0.030
- Warm Blue #4B57DB ΔE 0.039
- Royal Blue #4169E1 ΔE 0.046
- Neon Blue #4361EE ΔE 0.059
- French Blue #436BAD ΔE 0.066
Use #5A5FCB 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.