#5F64C9
Closest named color: Dark Periwinkle (#665FD1). oklch(55% 0.154 277.9), rgb(95, 100, 201).
Aa
White text reads best on this color (5.05:1).
About this color
#5F64C9 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.154 and its hue 278°. 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 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #5F64C9 |
| RGB | rgb(95, 100, 201) |
| HSL | hsl(237, 50%, 58%) |
| OKLCH | oklch(55% 0.154 277.9) |
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 #5F64C9 | 5.05:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #5F64C9 | 4.15:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #5F64C9 text on white | 5.05:1 | AA | Lc 74.7 | Content text, not long reading |
| #5F64C9 text on black | 4.15:1 | AA large text | Lc -27.0 | 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
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D3D7F3
oklch(88.5% 0.039 279.1)
-
Step 300
300
#B5BDEE
oklch(80.9% 0.07 277.5)
-
Step 400
400
#9099E5
oklch(70.6% 0.111 278)
-
Step 500
500
#777EDD
oklch(63% 0.142 278.3)
-
Step 600
600 (this color)
#5F64C9
oklch(55% 0.154 277.9)
-
Step 700
700
#5054AF
oklch(49.1% 0.142 277.9)
-
Step 800
800
#41458E
oklch(42.6% 0.119 277.7)
-
Step 900
900
#373B71
oklch(37.7% 0.091 277.9)
-
Step 950
950
#202342
oklch(27% 0.057 277.6)
#5F64C9 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) | #3273CD | 0.056 |
| Deuteranopia (no green cones) | #256AC7 | 0.059 |
| Tritanopia (no blue cones) | #307A8D | 0.134 |
| Achromatopsia (no color) | #6F6F6F | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5F64C9
#5F64C9
oklch(55% 0.154 277.9)
- #847100
#847100
oklch(55% 0.114 97.4)
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 #5F64C9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.020
- Slate Blue #6A5ACD ΔE 0.029
- Iris #6258C4 ΔE 0.029
- Light Indigo #6D5ACF ΔE 0.032
- Royal Blue #4169E1 ΔE 0.049
- Warm Blue #4B57DB ΔE 0.053
- French Blue #436BAD ΔE 0.061
- Neon Blue #4361EE ΔE 0.067
Use #5F64C9 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.