#3F5FD5
Closest named color: Warm Blue (#4B57DB). oklch(53% 0.185 268), rgb(63, 95, 213).
Aa
White text reads best on this color (5.51:1).
About this color
#3F5FD5 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.185 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.023 away. White text reads best on it, at 5.51:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.80:1 |
| White text | 5.51:1 |
Values
| HEX | #3F5FD5 |
| RGB | rgb(63, 95, 213) |
| HSL | hsl(227, 64%, 54%) |
| OKLCH | oklch(53% 0.185 268) |
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 #3F5FD5 | 5.51:1 | AA | Lc -82.4 | Fine for body text |
| Black text on #3F5FD5 | 3.80:1 | AA large text | Lc 27.0 | Dividers and decoration only |
| #3F5FD5 text on white | 5.51:1 | AA | Lc 77.1 | Fine for body text |
| #3F5FD5 text on black | 3.80:1 | AA large text | Lc -24.7 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9F9
oklch(88.6% 0.046 267.9)
-
Step 300
300
#A9BFF7
oklch(80.8% 0.083 267.9)
-
Step 400
400
#7D9CF4
oklch(70.7% 0.134 268.2)
-
Step 500
500
#5E81EF
oklch(63.2% 0.169 268)
-
Step 600
600 (this color)
#3F5FD5
oklch(53% 0.185 268)
-
Step 700
700
#3855C1
oklch(49.2% 0.172 268.1)
-
Step 800
800
#2E469C
oklch(42.7% 0.143 268)
-
Step 900
900
#283C7C
oklch(37.7% 0.111 267.7)
-
Step 950
950
#182448
oklch(27.1% 0.069 267.8)
#3F5FD5 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) | #0070D9 | 0.048 |
| Deuteranopia (no green cones) | #0062D3 | 0.036 |
| Tritanopia (no blue cones) | #007C91 | 0.149 |
| Achromatopsia (no color) | #696969 | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5FD5
#3F5FD5
oklch(53% 0.185 268)
- #866700
#866700
oklch(53% 0.108 87.8)
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 #3F5FD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.023
- Royal Blue #4169E1 ΔE 0.030
- Neon Blue #4361EE ΔE 0.039
- Azul #1D5DEC ΔE 0.044
- Dark Periwinkle #665FD1 ΔE 0.051
- Iris #6258C4 ΔE 0.052
- Cerulean Blue #056EEE ΔE 0.055
- Slate Blue #6A5ACD ΔE 0.058
Use #3F5FD5 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.