#3F5DB9
Closest named color: Mid Blue (#276AB3). oklch(50.5% 0.149 267.3), rgb(63, 93, 185).
Aa
White text reads best on this color (6.03:1).
About this color
#3F5DB9 is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.149 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.040 away. White text reads best on it, at 6.03:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.47:1 |
| White text | 6.03:1 |
Values
| HEX | #3F5DB9 |
| RGB | rgb(63, 93, 185) |
| HSL | hsl(225, 49%, 49%) |
| OKLCH | oklch(50.5% 0.149 267.3) |
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 #3F5DB9 | 6.03:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #3F5DB9 | 3.47:1 | AA large text | Lc 24.2 | Dividers and decoration only |
| #3F5DB9 text on white | 6.03:1 | AA | Lc 79.9 | Fine for body text |
| #3F5DB9 text on black | 3.47:1 | AA large text | Lc -22.0 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CDD9F5
oklch(88.5% 0.041 267.1)
-
Step 300
300
#ACC0F0
oklch(80.9% 0.072 267.1)
-
Step 400
400
#819EE9
oklch(70.8% 0.115 267.3)
-
Step 500
500
#6284E2
oklch(63.2% 0.147 267.2)
-
Step 600
600
#4A6BD0
oklch(55.6% 0.16 267.4)
-
Step 700
700 (this color)
#3F5DB9
oklch(50.5% 0.149 267.3)
-
Step 800
800
#314992
oklch(42.7% 0.124 267.3)
-
Step 900
900
#2B3E74
oklch(37.8% 0.095 267.2)
-
Step 950
950
#192544
oklch(27.1% 0.06 266.5)
#3F5DB9 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) | #2A69BC | 0.034 |
| Deuteranopia (no green cones) | #065DB7 | 0.038 |
| Tritanopia (no blue cones) | #007282 | 0.123 |
| Achromatopsia (no color) | #636363 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5DB9
#3F5DB9
oklch(50.5% 0.149 267.3)
- #7E6000
#7E6000
oklch(50.6% 0.103 87.2)
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 #3F5DB9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.040
- French Blue #436BAD ΔE 0.046
- Iris #6258C4 ΔE 0.051
- Warm Blue #4B57DB ΔE 0.057
- Dusky Blue #475F94 ΔE 0.061
- Denim Blue #3B5B92 ΔE 0.063
- Dark Periwinkle #665FD1 ΔE 0.065
- Royal Blue #4169E1 ΔE 0.067
Use #3F5DB9 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.