#3F3357
Closest named color: Prussian Blue (#1D3557). oklch(35.1% 0.063 298.5), rgb(63, 51, 87).
Aa
White text reads best on this color (11.52:1).
About this color
#3F3357 is a dark, muted purple. In OKLCH its lightness is 35%, its chroma 0.063 and its hue 298°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.052 away. White text reads best on it, at 11.52:1.
| Hue family | Purples |
| Lightness | dark (35%) |
| Chroma | muted (0.063) |
| Temperature | in between |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.82:1 |
| White text | 11.52:1 |
Values
| HEX | #3F3357 |
| RGB | rgb(63, 51, 87) |
| HSL | hsl(260, 26%, 27%) |
| OKLCH | oklch(35.1% 0.063 298.5) |
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 #3F3357 | 11.52:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #3F3357 | 1.82:1 | Fails | Lc 7.4 | Not readable |
| #3F3357 text on white | 11.52:1 | AAA | Lc 96.5 | Preferred for body text |
| #3F3357 text on black | 1.82:1 | Fails | Lc 0.0 | Not readable |
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 900.
-
Step 50
50
#F6F5F9
oklch(97.2% 0.005 297.7)
-
Step 100
100
#EBE8F2
oklch(93.6% 0.014 299.8)
-
Step 200
200
#DBD6E9
oklch(88.6% 0.026 297.9)
-
Step 300
300
#C4BBDC
oklch(81% 0.047 297.8)
-
Step 400
400
#A697CA
oklch(70.7% 0.075 297.9)
-
Step 500
500
#917CBC
oklch(63% 0.097 298.7)
-
Step 600
600
#7B65A8
oklch(55.6% 0.104 298.1)
-
Step 700
700
#685390
oklch(49% 0.098 298.6)
-
Step 800
800
#554475
oklch(42.6% 0.081 298.9)
-
Step 900
900 (this color)
#3F3357
oklch(35.1% 0.063 298.5)
-
Step 950
950
#292237
oklch(27% 0.039 299.1)
#3F3357 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) | #2A3958 | 0.036 |
| Deuteranopia (no green cones) | #2C3956 | 0.035 |
| Tritanopia (no blue cones) | #3A3941 | 0.049 |
| Achromatopsia (no color) | #393939 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3357
#3F3357
oklch(35.1% 0.063 298.5)
- #383F16
#383F16
oklch(35.1% 0.062 117.8)
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 #3F3357, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.052
- Space Cadet #2B2D42 ΔE 0.055
- Onyx #343A40 ΔE 0.056
- Gunmetal #293241 ΔE 0.056
- Dark Blue Grey #1F3B4D ΔE 0.058
- Dark Grey Blue #29465B ΔE 0.063
- Charcoal Grey #3C4142 ΔE 0.066
- Charcoal #264653 ΔE 0.069
Use #3F3357 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.