#3F529A
Closest named color: Denim Blue (#3B5B92). oklch(46.1% 0.119 270.1), rgb(63, 82, 154).
Aa
White text reads best on this color (7.27:1).
About this color
#3F529A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.119 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.031 away. White text reads best on it, at 7.27:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.88:1 |
| White text | 7.27:1 |
Values
| HEX | #3F529A |
| RGB | rgb(63, 82, 154) |
| HSL | hsl(227, 42%, 43%) |
| OKLCH | oklch(46.1% 0.119 270.1) |
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 #3F529A | 7.27:1 | AAA | Lc -90.0 | Fine for body text |
| Black text on #3F529A | 2.88:1 | Fails | Lc 18.9 | Dividers and decoration only |
| #3F529A text on white | 7.27:1 | AAA | Lc 85.1 | Fine for body text |
| #3F529A text on black | 2.88:1 | Fails | Lc -16.9 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B2C0E7
oklch(81% 0.057 269.6)
-
Step 400
400
#8A9EDB
oklch(70.7% 0.093 270)
-
Step 500
500
#6E85D1
oklch(63.2% 0.118 270)
-
Step 600
600
#576DBE
oklch(55.6% 0.128 270.4)
-
Step 700
700 (this color)
#3F529A
oklch(46.1% 0.119 270.1)
-
Step 800
800
#3A4B85
oklch(42.8% 0.098 269.6)
-
Step 900
900
#323F6A
oklch(37.8% 0.076 269.8)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#3F529A 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) | #315B9D | 0.027 |
| Deuteranopia (no green cones) | #235398 | 0.029 |
| Tritanopia (no blue cones) | #00626E | 0.106 |
| Achromatopsia (no color) | #575757 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F529A
#3F529A
oklch(46.1% 0.119 270.1)
- #6D5500
#6D5500
oklch(46.1% 0.094 89.7)
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 #3F529A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.031
- Twilight #4E518B ΔE 0.031
- Dusk Blue #26538D ΔE 0.036
- Dusky Blue #475F94 ΔE 0.043
- Blueberry #464196 ΔE 0.044
- Light Navy Blue #2E5A88 ΔE 0.044
- Dusk #4E5481 ΔE 0.047
- Cobalt #1E488F ΔE 0.052
Use #3F529A 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.