#3F61E9
Closest named color: Neon Blue (#4361EE). oklch(55% 0.209 268), rgb(63, 97, 233).
Aa
White text reads best on this color (5.12:1).
About this color
#3F61E9 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.209 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.009 away. White text reads best on it, at 5.12:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.209) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.09:1 |
| White text | 5.12:1 |
Values
| HEX | #3F61E9 |
| RGB | rgb(63, 97, 233) |
| HSL | hsl(228, 79%, 58%) |
| OKLCH | oklch(55% 0.209 268) |
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 #3F61E9 | 5.12:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #3F61E9 | 4.09:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #3F61E9 text on white | 5.12:1 | AA | Lc 74.8 | Content text, not long reading |
| #3F61E9 text on black | 4.09:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#CAD9FD
oklch(88.6% 0.052 267.4)
-
Step 300
300
#A6BFFE
oklch(80.9% 0.094 267.6)
-
Step 400
400
#789BFE
oklch(70.7% 0.15 267.8)
-
Step 500
500
#587EFC
oklch(63.1% 0.192 267.9)
-
Step 600
600 (this color)
#3F61E9
oklch(55% 0.209 268)
-
Step 700
700
#3351CD
oklch(49.2% 0.195 267.9)
-
Step 800
800
#2A43A5
oklch(42.6% 0.161 267.9)
-
Step 900
900
#263A83
oklch(37.7% 0.125 268.3)
-
Step 950
950
#16234D
oklch(27.1% 0.079 267.9)
#3F61E9 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) | #0076EE | 0.053 |
| Deuteranopia (no green cones) | #0066E6 | 0.034 |
| Tritanopia (no blue cones) | #00839C | 0.165 |
| Achromatopsia (no color) | #6E6E6E | 0.209 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F61E9
#3F61E9
oklch(55% 0.209 268)
- #8D6D00
#8D6D00
oklch(55.1% 0.113 88.2)
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 #3F61E9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.009
- Royal Blue #4169E1 ΔE 0.023
- Azul #1D5DEC ΔE 0.030
- Warm Blue #4B57DB ΔE 0.032
- Cerulean Blue #056EEE ΔE 0.038
- Bright Blue #0165FC ΔE 0.042
- Dark Periwinkle #665FD1 ΔE 0.060
- Electric Blue #0652FF ΔE 0.061
Use #3F61E9 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.