#3F54BE
Closest named color: Warm Blue (#4B57DB). oklch(49.1% 0.168 270.6), rgb(63, 84, 190).
Aa
White text reads best on this color (6.51:1).
About this color
#3F54BE is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.168 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.049 away. White text reads best on it, at 6.51:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.22:1 |
| White text | 6.51:1 |
Values
| HEX | #3F54BE |
| RGB | rgb(63, 84, 190) |
| HSL | hsl(230, 50%, 50%) |
| OKLCH | oklch(49.1% 0.168 270.6) |
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 #3F54BE | 6.51:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #3F54BE | 3.22:1 | AA large text | Lc 22.2 | Dividers and decoration only |
| #3F54BE text on white | 6.51:1 | AA | Lc 81.9 | Fine for body text |
| #3F54BE text on black | 3.22:1 | AA large text | Lc -20.0 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F8
oklch(88.5% 0.045 271.7)
-
Step 300
300
#ADBFF6
oklch(81% 0.081 270.5)
-
Step 400
400
#829BF1
oklch(70.6% 0.129 270.5)
-
Step 500
500
#6580ED
oklch(63.2% 0.166 270.6)
-
Step 600
600
#4E66DB
oklch(55.6% 0.18 270.7)
-
Step 700
700 (this color)
#3F54BE
oklch(49.1% 0.168 270.6)
-
Step 800
800
#34459A
oklch(42.7% 0.14 270.8)
-
Step 900
900
#2D3B7A
oklch(37.6% 0.108 271)
-
Step 950
950
#1A2348
oklch(27% 0.07 270.8)
#3F54BE 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) | #0064C2 | 0.050 |
| Deuteranopia (no green cones) | #0058BC | 0.041 |
| Tritanopia (no blue cones) | #006E81 | 0.138 |
| Achromatopsia (no color) | #5E5E5E | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F54BE
#3F54BE
oklch(49.1% 0.168 270.6)
- #765D00
#765D00
oklch(49% 0.1 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 #3F54BE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.049
- Iris #6258C4 ΔE 0.052
- Blue With A Hint Of Purple #533CC6 ΔE 0.057
- Blue Blue #2242C7 ΔE 0.058
- Bluey Purple #6241C7 ΔE 0.063
- Mid Blue #276AB3 ΔE 0.063
- Blurple #5539CC ΔE 0.064
- Majorelle Blue #3F37C9 ΔE 0.064
Use #3F54BE 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.