#3F5D9E
Closest named color: Denim Blue (#3B5B92). oklch(48.7% 0.111 264), rgb(63, 93, 158).
Aa
White text reads best on this color (6.42:1).
About this color
#3F5D9E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 49%, its chroma 0.111 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.020 away. White text reads best on it, at 6.42:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.27:1 |
| White text | 6.42:1 |
Values
| HEX | #3F5D9E |
| RGB | rgb(63, 93, 158) |
| HSL | hsl(221, 43%, 43%) |
| OKLCH | oklch(48.7% 0.111 264) |
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 #3F5D9E | 6.42:1 | AA | Lc -86.8 | Fine for body text |
| Black text on #3F5D9E | 3.27:1 | AA large text | Lc 22.3 | Dividers and decoration only |
| #3F5D9E text on white | 6.42:1 | AA | Lc 81.7 | Fine for body text |
| #3F5D9E text on black | 3.27:1 | AA large text | Lc -20.2 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#CFD9ED
oklch(88.4% 0.03 264.4)
-
Step 300
300
#AFC1E4
oklch(80.9% 0.053 263.7)
-
Step 400
400
#85A0D7
oklch(70.6% 0.087 264.1)
-
Step 500
500
#6788CC
oklch(63.1% 0.11 263.8)
-
Step 600
600
#4F71B9
oklch(55.7% 0.119 263.9)
-
Step 700
700 (this color)
#3F5D9E
oklch(48.7% 0.111 264)
-
Step 800
800
#354D81
oklch(42.7% 0.092 264.2)
-
Step 900
900
#2E4067
oklch(37.6% 0.071 264.4)
-
Step 950
950
#1B263D
oklch(27% 0.046 264.1)
#3F5D9E 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) | #4163A1 | 0.017 |
| Deuteranopia (no green cones) | #345B9D | 0.014 |
| Tritanopia (no blue cones) | #006B76 | 0.095 |
| Achromatopsia (no color) | #5F5F5F | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5D9E
#3F5D9E
oklch(48.7% 0.111 264)
- #7A5A00
#7A5A00
oklch(48.8% 0.1 84.4)
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 #3F5D9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.020
- Dusky Blue #475F94 ΔE 0.021
- Denim #3B638C ΔE 0.038
- Light Navy Blue #2E5A88 ΔE 0.042
- Twilight #4E518B ΔE 0.043
- French Blue #436BAD ΔE 0.044
- Mid Blue #276AB3 ΔE 0.046
- Dusk Blue #26538D ΔE 0.049
Use #3F5D9E 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.