#5665D3
Closest named color: Dark Periwinkle (#665FD1). oklch(55.3% 0.168 273.7), rgb(86, 101, 211).
Aa
White text reads best on this color (5.00:1).
About this color
#5665D3 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.168 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.025 away. White text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #5665D3 |
| RGB | rgb(86, 101, 211) |
| HSL | hsl(233, 59%, 58%) |
| OKLCH | oklch(55.3% 0.168 273.7) |
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 #5665D3 | 5.00:1 | AA | Lc -79.7 | Fine for body text |
| Black text on #5665D3 | 4.19:1 | AA large text | Lc 29.8 | Dividers and decoration only |
| #5665D3 text on white | 5.00:1 | AA | Lc 74.3 | Content text, not long reading |
| #5665D3 text on black | 4.19:1 | AA large text | Lc -27.4 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#D0D8F6
oklch(88.6% 0.042 273.7)
-
Step 300
300
#B1BEF2
oklch(81% 0.075 273.7)
-
Step 400
400
#899AEC
oklch(70.7% 0.122 274)
-
Step 500
500
#6D7FE6
oklch(63.1% 0.155 273.7)
-
Step 600
600 (this color)
#5665D3
oklch(55.3% 0.168 273.7)
-
Step 700
700
#4754B8
oklch(49.1% 0.157 273.6)
-
Step 800
800
#3A4595
oklch(42.7% 0.131 273.6)
-
Step 900
900
#323B76
oklch(37.7% 0.1 274.1)
-
Step 950
950
#1D2345
oklch(27% 0.063 273.9)
#5665D3 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) | #2475D7 | 0.054 |
| Deuteranopia (no green cones) | #006AD1 | 0.059 |
| Tritanopia (no blue cones) | #007E92 | 0.146 |
| Achromatopsia (no color) | #6F6F6F | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5665D3
#5665D3
oklch(55.3% 0.168 273.7)
- #897000
#897000
oklch(55.3% 0.113 93.3)
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 #5665D3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.025
- Royal Blue #4169E1 ΔE 0.031
- Slate Blue #6A5ACD ΔE 0.036
- Iris #6258C4 ΔE 0.039
- Light Indigo #6D5ACF ΔE 0.039
- Warm Blue #4B57DB ΔE 0.041
- Neon Blue #4361EE ΔE 0.048
- Cerulean Blue #056EEE ΔE 0.067
Use #5665D3 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.