#5D66C5
Closest named color: Dark Periwinkle (#665FD1). oklch(55% 0.146 276.4), rgb(93, 102, 197).
Aa
White text reads best on this color (5.03:1).
About this color
#5D66C5 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.146 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.029 away. White text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.17:1 |
| White text | 5.03:1 |
Values
| HEX | #5D66C5 |
| RGB | rgb(93, 102, 197) |
| HSL | hsl(235, 47%, 57%) |
| OKLCH | oklch(55% 0.146 276.4) |
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 #5D66C5 | 5.03:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #5D66C5 | 4.17:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #5D66C5 text on white | 5.03:1 | AA | Lc 74.6 | Content text, not long reading |
| #5D66C5 text on black | 4.17:1 | AA large text | Lc -27.1 | 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 600.
-
Step 50
50
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D2D8F2
oklch(88.6% 0.036 275.3)
-
Step 300
300
#B5BEEC
oklch(81% 0.066 276.2)
-
Step 400
400
#8F9BE2
oklch(70.8% 0.105 276)
-
Step 500
500
#7580D9
oklch(63.1% 0.134 276.5)
-
Step 600
600 (this color)
#5D66C5
oklch(55% 0.146 276.4)
-
Step 700
700
#4E56AC
oklch(49.1% 0.136 276.2)
-
Step 800
800
#40478B
oklch(42.8% 0.111 276.2)
-
Step 900
900
#363C6F
oklch(37.7% 0.087 276.3)
-
Step 950
950
#1F2341
oklch(26.9% 0.056 276.2)
#5D66C5 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) | #3A73C8 | 0.047 |
| Deuteranopia (no green cones) | #2E6BC3 | 0.050 |
| Tritanopia (no blue cones) | #2E7B8C | 0.129 |
| Achromatopsia (no color) | #6F6F6F | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5D66C5
#5D66C5
oklch(55% 0.146 276.4)
- #857100
#857100
oklch(55.1% 0.114 96.8)
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 #5D66C5, closest first.
No curated palette has a color within ΔE 0.04 of #5D66C5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.029
- Iris #6258C4 ΔE 0.034
- Slate Blue #6A5ACD ΔE 0.036
- Light Indigo #6D5ACF ΔE 0.040
- Royal Blue #4169E1 ΔE 0.052
- French Blue #436BAD ΔE 0.053
- Warm Blue #4B57DB ΔE 0.059
- Windows Blue #3778BF ΔE 0.060
Use #5D66C5 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.