#3F5BEA
Closest named color: Neon Blue (#4361EE). oklch(54% 0.217 269.1), rgb(63, 91, 234).
Aa
White text reads best on this color (5.39:1).
About this color
#3F5BEA is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.217 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.016 away. White text reads best on it, at 5.39:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.217) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 3.89:1 |
| White text | 5.39:1 |
Values
| HEX | #3F5BEA |
| RGB | rgb(63, 91, 234) |
| HSL | hsl(230, 80%, 58%) |
| OKLCH | oklch(54% 0.217 269.1) |
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 #3F5BEA | 5.39:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #3F5BEA | 3.89:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #3F5BEA text on white | 5.39:1 | AA | Lc 76.2 | Fine for body text |
| #3F5BEA text on black | 3.89:1 | AA large text | Lc -25.5 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2EAFE
oklch(93.7% 0.028 268.4)
-
Step 200
200
#CAD8FE
oklch(88.4% 0.055 269.3)
-
Step 300
300
#A7BEFF
oklch(80.8% 0.096 269.2)
-
Step 400
400
#7A9AFF
oklch(70.7% 0.152 269)
-
Step 500
500
#5A7CFF
oklch(63% 0.198 269.1)
-
Step 600
600 (this color)
#3F5BEA
oklch(54% 0.217 269.1)
-
Step 700
700
#364ED1
oklch(49.1% 0.202 269.3)
-
Step 800
800
#2C41A9
oklch(42.7% 0.168 269.2)
-
Step 900
900
#273985
oklch(37.7% 0.129 269.2)
-
Step 950
950
#16224E
oklch(26.9% 0.083 268.8)
#3F5BEA 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) | #0072EF | 0.056 |
| Deuteranopia (no green cones) | #0062E7 | 0.036 |
| Tritanopia (no blue cones) | #00809A | 0.172 |
| Achromatopsia (no color) | #6A6A6A | 0.218 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5BEA
#3F5BEA
oklch(54% 0.217 269.1)
- #886A00
#886A00
oklch(53.9% 0.11 89.1)
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 #3F5BEA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.016
- Azul #1D5DEC ΔE 0.026
- Warm Blue #4B57DB ΔE 0.027
- Royal Blue #4169E1 ΔE 0.036
- Bright Blue #0165FC ΔE 0.044
- Cerulean Blue #056EEE ΔE 0.048
- Electric Blue #0652FF ΔE 0.053
- Dark Periwinkle #665FD1 ΔE 0.065
Use #3F5BEA 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.