#3F58E4
Closest named color: Warm Blue (#4B57DB). oklch(52.9% 0.213 269.7), rgb(63, 88, 228).
Aa
White text reads best on this color (5.63:1).
About this color
#3F58E4 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.213 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.019 away. White text reads best on it, at 5.63:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.213) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.72:1 |
| White text | 5.63:1 |
Values
| HEX | #3F58E4 |
| RGB | rgb(63, 88, 228) |
| HSL | hsl(231, 75%, 57%) |
| OKLCH | oklch(52.9% 0.213 269.7) |
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 #3F58E4 | 5.63:1 | AA | Lc -82.8 | Fine for body text |
| Black text on #3F58E4 | 3.72:1 | AA large text | Lc 26.5 | Dividers and decoration only |
| #3F58E4 text on white | 5.63:1 | AA | Lc 77.5 | Fine for body text |
| #3F58E4 text on black | 3.72:1 | AA large text | Lc -24.2 | 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
#CBD8FD
oklch(88.4% 0.053 270)
-
Step 300
300
#A8BEFF
oklch(80.9% 0.096 269.8)
-
Step 400
400
#7B9AFF
oklch(70.8% 0.152 269.4)
-
Step 500
500
#5C7CFE
oklch(63.1% 0.196 269.6)
-
Step 600
600 (this color)
#3F58E4
oklch(52.9% 0.213 269.7)
-
Step 700
700
#384FCF
oklch(49.2% 0.198 269.6)
-
Step 800
800
#2E42A7
oklch(42.8% 0.163 269.6)
-
Step 900
900
#283984
oklch(37.7% 0.127 269.7)
-
Step 950
950
#17224D
oklch(26.9% 0.081 269.5)
#3F58E4 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) | #006FE9 | 0.057 |
| Deuteranopia (no green cones) | #0060E1 | 0.037 |
| Tritanopia (no blue cones) | #007C96 | 0.169 |
| Achromatopsia (no color) | #676767 | 0.213 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F58E4
#3F58E4
oklch(52.9% 0.213 269.7)
- #846800
#846800
oklch(53% 0.108 90.1)
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 #3F58E4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.019
- Neon Blue #4361EE ΔE 0.026
- Azul #1D5DEC ΔE 0.029
- Royal Blue #4169E1 ΔE 0.041
- Bright Blue #0165FC ΔE 0.052
- Cerulean Blue #056EEE ΔE 0.055
- Electric Blue #0652FF ΔE 0.056
- Dark Periwinkle #665FD1 ΔE 0.063
Use #3F58E4 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.