#3F5BB9
Closest named color: Mid Blue (#276AB3). oklch(50.1% 0.152 268.1), rgb(63, 91, 185).
Aa
White text reads best on this color (6.16:1).
About this color
#3F5BB9 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.152 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.045 away. White text reads best on it, at 6.16:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.40:1 |
| White text | 6.16:1 |
Values
| HEX | #3F5BB9 |
| RGB | rgb(63, 91, 185) |
| HSL | hsl(226, 49%, 49%) |
| OKLCH | oklch(50.1% 0.152 268.1) |
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 #3F5BB9 | 6.16:1 | AA | Lc -85.6 | Fine for body text |
| Black text on #3F5BB9 | 3.40:1 | AA large text | Lc 23.6 | Dividers and decoration only |
| #3F5BB9 text on white | 6.16:1 | AA | Lc 80.4 | Fine for body text |
| #3F5BB9 text on black | 3.40:1 | AA large text | Lc -21.4 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CDD9F5
oklch(88.5% 0.041 267.1)
-
Step 300
300
#ACC0F1
oklch(81% 0.073 267.4)
-
Step 400
400
#819DEA
oklch(70.6% 0.118 268.1)
-
Step 500
500
#6383E4
oklch(63.2% 0.15 268.2)
-
Step 600
600
#4B6AD2
oklch(55.6% 0.164 268.2)
-
Step 700
700 (this color)
#3F5BB9
oklch(50.1% 0.152 268.1)
-
Step 800
800
#324893
oklch(42.6% 0.126 268.3)
-
Step 900
900
#2B3D75
oklch(37.6% 0.098 268)
-
Step 950
950
#192445
oklch(26.9% 0.063 268.1)
#3F5BB9 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) | #2567BC | 0.035 |
| Deuteranopia (no green cones) | #005CB7 | 0.040 |
| Tritanopia (no blue cones) | #007181 | 0.126 |
| Achromatopsia (no color) | #616161 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5BB9
#3F5BB9
oklch(50.1% 0.152 268.1)
- #7C5F00
#7C5F00
oklch(50.1% 0.102 87.8)
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 #3F5BB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.045
- Iris #6258C4 ΔE 0.051
- French Blue #436BAD ΔE 0.051
- Warm Blue #4B57DB ΔE 0.056
- Dusky Blue #475F94 ΔE 0.063
- Denim Blue #3B5B92 ΔE 0.063
- Dark Periwinkle #665FD1 ΔE 0.067
- Slate Blue #6A5ACD ΔE 0.068
Use #3F5BB9 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.