#3F5BD0
Closest named color: Warm Blue (#4B57DB). oklch(51.9% 0.183 268.9), rgb(63, 91, 208).
Aa
White text reads best on this color (5.80:1).
About this color
#3F5BD0 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.183 and its hue 269°. 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 5.80:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.61:1 |
| White text | 5.80:1 |
Values
| HEX | #3F5BD0 |
| RGB | rgb(63, 91, 208) |
| HSL | hsl(228, 61%, 53%) |
| OKLCH | oklch(51.9% 0.183 268.9) |
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 #3F5BD0 | 5.80:1 | AA | Lc -83.8 | Fine for body text |
| Black text on #3F5BD0 | 3.61:1 | AA large text | Lc 25.5 | Dividers and decoration only |
| #3F5BD0 text on white | 5.80:1 | AA | Lc 78.6 | Fine for body text |
| #3F5BD0 text on black | 3.61:1 | AA large text | Lc -23.2 | 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 700.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3EAFC
oklch(93.7% 0.025 268.8)
-
Step 200
200
#CCD9FB
oklch(88.6% 0.049 268.8)
-
Step 300
300
#A9BFFB
oklch(81% 0.089 268.8)
-
Step 400
400
#7C9BF9
oklch(70.7% 0.142 268.8)
-
Step 500
500
#5D7FF6
oklch(63.2% 0.181 268.8)
-
Step 600
600
#4664E4
oklch(55.5% 0.197 269)
-
Step 700
700 (this color)
#3F5BD0
oklch(51.9% 0.183 268.9)
-
Step 800
800
#2E44A1
oklch(42.7% 0.153 268.9)
-
Step 900
900
#283B7F
oklch(37.7% 0.117 268.5)
-
Step 950
950
#18234B
oklch(27.1% 0.075 269.3)
#3F5BD0 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) | #006CD4 | 0.049 |
| Deuteranopia (no green cones) | #005FCE | 0.037 |
| Tritanopia (no blue cones) | #00788C | 0.150 |
| Achromatopsia (no color) | #656565 | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5BD0
#3F5BD0
oklch(51.9% 0.183 268.9)
- #816400
#816400
oklch(51.8% 0.106 88.7)
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 #3F5BD0, closest first.
No curated palette has a color within ΔE 0.04 of #3F5BD0.
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 0.042
- Neon Blue #4361EE ΔE 0.048
- Iris #6258C4 ΔE 0.049
- Azul #1D5DEC ΔE 0.049
- Dark Periwinkle #665FD1 ΔE 0.054
- Slate Blue #6A5ACD ΔE 0.058
- Light Indigo #6D5ACF ΔE 0.063
Use #3F5BD0 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.