#3F50CF
Closest named color: Warm Blue (#4B57DB). oklch(49.7% 0.195 271.4), rgb(63, 80, 207).
Aa
White text reads best on this color (6.44:1).
About this color
#3F50CF is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.195 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.030 away. White text reads best on it, at 6.44:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.195) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.25:1 |
| White text | 6.44:1 |
Values
| HEX | #3F50CF |
| RGB | rgb(63, 80, 207) |
| HSL | hsl(233, 60%, 53%) |
| OKLCH | oklch(49.7% 0.195 271.4) |
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 #3F50CF | 6.44:1 | AA | Lc -86.5 | Fine for body text |
| Black text on #3F50CF | 3.25:1 | AA large text | Lc 22.6 | Dividers and decoration only |
| #3F50CF text on white | 6.44:1 | AA | Lc 81.4 | Fine for body text |
| #3F50CF text on black | 3.25:1 | AA large text | Lc -20.5 | 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
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CCD8FD
oklch(88.5% 0.053 271.1)
-
Step 300
300
#AABEFE
oklch(81% 0.094 270.8)
-
Step 400
400
#7F99FE
oklch(70.8% 0.151 271.2)
-
Step 500
500
#627BFC
oklch(63.1% 0.193 271.6)
-
Step 600
600
#4C60EB
oklch(55.6% 0.209 271.5)
-
Step 700
700 (this color)
#3F50CF
oklch(49.7% 0.195 271.4)
-
Step 800
800
#3241A6
oklch(42.7% 0.162 271.3)
-
Step 900
900
#2B3883
oklch(37.6% 0.126 271.5)
-
Step 950
950
#19224D
oklch(27.1% 0.08 271.2)
#3F50CF 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) | #0065D3 | 0.056 |
| Deuteranopia (no green cones) | #0058CD | 0.041 |
| Tritanopia (no blue cones) | #007088 | 0.156 |
| Achromatopsia (no color) | #5E5E5E | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F50CF
#3F50CF
oklch(49.7% 0.195 271.4)
- #786000
#786000
oklch(49.9% 0.102 91.7)
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 #3F50CF, closest first.
No curated palette has a color within ΔE 0.04 of #3F50CF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.030
- Blue With A Hint Of Purple #533CC6 ΔE 0.048
- Blue Blue #2242C7 ΔE 0.050
- Blurple #5539CC ΔE 0.052
- Majorelle Blue #3F37C9 ΔE 0.052
- Azul #1D5DEC ΔE 0.056
- Bluey Purple #6241C7 ΔE 0.058
- Iris #6258C4 ΔE 0.058
Use #3F50CF 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.