#3F52BF
Closest named color: Warm Blue (#4B57DB). oklch(48.8% 0.171 271.1), rgb(63, 82, 191).
Aa
White text reads best on this color (6.62:1).
About this color
#3F52BF is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.171 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.048 away. White text reads best on it, at 6.62:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.17:1 |
| White text | 6.62:1 |
Values
| HEX | #3F52BF |
| RGB | rgb(63, 82, 191) |
| HSL | hsl(231, 50%, 50%) |
| OKLCH | oklch(48.8% 0.171 271.1) |
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 #3F52BF | 6.62:1 | AA | Lc -87.4 | Fine for body text |
| Black text on #3F52BF | 3.17:1 | AA large text | Lc 21.7 | Dividers and decoration only |
| #3F52BF text on white | 6.62:1 | AA | Lc 82.3 | Fine for body text |
| #3F52BF text on black | 3.17:1 | AA large text | Lc -19.6 | 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 700.
-
Step 50
50
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CED8F9
oklch(88.5% 0.047 272.1)
-
Step 300
300
#ADBEF7
oklch(80.9% 0.083 271.6)
-
Step 400
400
#829BF3
oklch(70.7% 0.132 270.7)
-
Step 500
500
#657FEF
oklch(63.2% 0.17 271)
-
Step 600
600
#4E65DD
oklch(55.6% 0.184 271)
-
Step 700
700 (this color)
#3F52BF
oklch(48.8% 0.171 271.1)
-
Step 800
800
#34459B
oklch(42.7% 0.141 270.8)
-
Step 900
900
#2D3B7B
oklch(37.7% 0.11 271)
-
Step 950
950
#1A2348
oklch(27% 0.07 270.8)
#3F52BF 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) | #0063C3 | 0.051 |
| Deuteranopia (no green cones) | #0057BD | 0.042 |
| Tritanopia (no blue cones) | #006D80 | 0.142 |
| Achromatopsia (no color) | #5D5D5D | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F52BF
#3F52BF
oklch(48.8% 0.171 271.1)
- #755D00
#755D00
oklch(48.8% 0.1 91.2)
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 #3F52BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.048
- Blue With A Hint Of Purple #533CC6 ΔE 0.052
- Blue Blue #2242C7 ΔE 0.054
- Iris #6258C4 ΔE 0.054
- Majorelle Blue #3F37C9 ΔE 0.059
- Blurple #5539CC ΔE 0.060
- Bluey Purple #6241C7 ΔE 0.060
- Mid Blue #276AB3 ΔE 0.068
Use #3F52BF 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.