#3F5BBE
Closest named color: Mid Blue (#276AB3). oklch(50.5% 0.159 268.3), rgb(63, 91, 190).
Aa
White text reads best on this color (6.08:1).
About this color
#3F5BBE is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.159 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.048 away. White text reads best on it, at 6.08:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.45:1 |
| White text | 6.08:1 |
Values
| HEX | #3F5BBE |
| RGB | rgb(63, 91, 190) |
| HSL | hsl(227, 50%, 50%) |
| OKLCH | oklch(50.5% 0.159 268.3) |
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 #3F5BBE | 6.08:1 | AA | Lc -85.2 | Fine for body text |
| Black text on #3F5BBE | 3.45:1 | AA large text | Lc 24.0 | Dividers and decoration only |
| #3F5BBE text on white | 6.08:1 | AA | Lc 80.0 | Fine for body text |
| #3F5BBE text on black | 3.45:1 | AA large text | Lc -21.8 | 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
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F6
oklch(88.5% 0.042 267.7)
-
Step 300
300
#ACBFF3
oklch(80.8% 0.077 269)
-
Step 400
400
#809DED
oklch(70.7% 0.122 268.1)
-
Step 500
500
#6282E8
oklch(63.1% 0.157 268.5)
-
Step 600
600
#4A69D6
oklch(55.6% 0.171 268.4)
-
Step 700
700 (this color)
#3F5BBE
oklch(50.5% 0.159 268.3)
-
Step 800
800
#314896
oklch(42.8% 0.131 268.1)
-
Step 900
900
#2B3D77
oklch(37.7% 0.101 268.3)
-
Step 950
950
#192446
oklch(27% 0.065 268.3)
#3F5BBE 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) | #1D68C2 | 0.039 |
| Deuteranopia (no green cones) | #005DBC | 0.039 |
| Tritanopia (no blue cones) | #007284 | 0.130 |
| Achromatopsia (no color) | #626262 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5BBE
#3F5BBE
oklch(50.5% 0.159 268.3)
- #7D6000
#7D6000
oklch(50.4% 0.103 88)
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 #3F5BBE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.048
- Iris #6258C4 ΔE 0.048
- Warm Blue #4B57DB ΔE 0.049
- French Blue #436BAD ΔE 0.055
- Dark Periwinkle #665FD1 ΔE 0.062
- Royal Blue #4169E1 ΔE 0.063
- Slate Blue #6A5ACD ΔE 0.064
- Light Indigo #6D5ACF ΔE 0.069
Use #3F5BBE 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.