#3F59DE
Closest named color: Warm Blue (#4B57DB). oklch(52.6% 0.204 269.5), rgb(63, 89, 222).
Aa
White text reads best on this color (5.68:1).
About this color
#3F59DE is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.204 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.015 away. White text reads best on it, at 5.68:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.204) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.69:1 |
| White text | 5.68:1 |
Values
| HEX | #3F59DE |
| RGB | rgb(63, 89, 222) |
| HSL | hsl(230, 71%, 56%) |
| OKLCH | oklch(52.6% 0.204 269.5) |
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 #3F59DE | 5.68:1 | AA | Lc -83.1 | Fine for body text |
| Black text on #3F59DE | 3.69:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #3F59DE text on white | 5.68:1 | AA | Lc 77.8 | Fine for body text |
| #3F59DE text on black | 3.69:1 | AA large text | Lc -23.9 | 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
#E3EAFC
oklch(93.7% 0.025 268.8)
-
Step 200
200
#CBD8FC
oklch(88.4% 0.052 269.6)
-
Step 300
300
#A9BEFD
oklch(80.8% 0.092 270)
-
Step 400
400
#7C9AFC
oklch(70.7% 0.147 269.5)
-
Step 500
500
#5D7DF9
oklch(63% 0.188 269.5)
-
Step 600
600 (this color)
#3F59DE
oklch(52.6% 0.204 269.5)
-
Step 700
700
#3951CA
oklch(49.2% 0.189 269.5)
-
Step 800
800
#2F43A3
oklch(42.7% 0.156 269.6)
-
Step 900
900
#293A82
oklch(37.8% 0.123 269.6)
-
Step 950
950
#18234C
oklch(27.1% 0.077 269.4)
#3F59DE 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) | #006EE2 | 0.054 |
| Deuteranopia (no green cones) | #0060DB | 0.037 |
| Tritanopia (no blue cones) | #007B93 | 0.163 |
| Achromatopsia (no color) | #676767 | 0.204 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F59DE
#3F59DE
oklch(52.6% 0.204 269.5)
- #836700
#836700
oklch(52.7% 0.108 89.9)
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 #3F59DE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.015
- Neon Blue #4361EE ΔE 0.031
- Azul #1D5DEC ΔE 0.033
- Royal Blue #4169E1 ΔE 0.039
- Cerulean Blue #056EEE ΔE 0.057
- Bright Blue #0165FC ΔE 0.058
- Dark Periwinkle #665FD1 ΔE 0.059
- Iris #6258C4 ΔE 0.061
Use #3F59DE 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.