#3F54CE
Closest named color: Warm Blue (#4B57DB). oklch(50.4% 0.189 270.6), rgb(63, 84, 206).
Aa
White text reads best on this color (6.23:1).
About this color
#3F54CE is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.189 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.027 away. White text reads best on it, at 6.23:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.189) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.37:1 |
| White text | 6.23:1 |
Values
| HEX | #3F54CE |
| RGB | rgb(63, 84, 206) |
| HSL | hsl(231, 59%, 53%) |
| OKLCH | oklch(50.4% 0.189 270.6) |
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 #3F54CE | 6.23:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #3F54CE | 3.37:1 | AA large text | Lc 23.5 | Dividers and decoration only |
| #3F54CE text on white | 6.23:1 | AA | Lc 80.5 | Fine for body text |
| #3F54CE text on black | 3.37:1 | AA large text | Lc -21.3 | 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
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CCD8FC
oklch(88.5% 0.051 270.8)
-
Step 300
300
#AABEFD
oklch(80.9% 0.092 270.6)
-
Step 400
400
#7F9AFB
oklch(70.8% 0.145 270.6)
-
Step 500
500
#617DF9
oklch(63.2% 0.187 270.6)
-
Step 600
600
#4A62E8
oklch(55.6% 0.203 270.6)
-
Step 700
700 (this color)
#3F54CE
oklch(50.4% 0.189 270.6)
-
Step 800
800
#3142A3
oklch(42.6% 0.157 270.7)
-
Step 900
900
#2A3981
oklch(37.6% 0.122 270.6)
-
Step 950
950
#19224C
oklch(27% 0.078 271.2)
#3F54CE 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) | #0067D2 | 0.052 |
| Deuteranopia (no green cones) | #005ACC | 0.040 |
| Tritanopia (no blue cones) | #007289 | 0.152 |
| Achromatopsia (no color) | #616161 | 0.189 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F54CE
#3F54CE
oklch(50.4% 0.189 270.6)
- #7B6100
#7B6100
oklch(50.4% 0.103 90.4)
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 #3F54CE, closest first.
No curated palette has a color within ΔE 0.04 of #3F54CE.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.027
- Iris #6258C4 ΔE 0.053
- Azul #1D5DEC ΔE 0.054
- Blue With A Hint Of Purple #533CC6 ΔE 0.055
- Blue Blue #2242C7 ΔE 0.057
- Royal Blue #4169E1 ΔE 0.058
- Neon Blue #4361EE ΔE 0.058
- Blurple #5539CC ΔE 0.059
Use #3F54CE 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.