#3F5DB1
Closest named color: Mid Blue (#276AB3). oklch(50% 0.138 266.6), rgb(63, 93, 177).
Aa
White text reads best on this color (6.15:1).
About this color
#3F5DB1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.138 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.038 away. White text reads best on it, at 6.15:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.41:1 |
| White text | 6.15:1 |
Values
| HEX | #3F5DB1 |
| RGB | rgb(63, 93, 177) |
| HSL | hsl(224, 48%, 47%) |
| OKLCH | oklch(50% 0.138 266.6) |
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 #3F5DB1 | 6.15:1 | AA | Lc -85.6 | Fine for body text |
| Black text on #3F5DB1 | 3.41:1 | AA large text | Lc 23.6 | Dividers and decoration only |
| #3F5DB1 text on white | 6.15:1 | AA | Lc 80.4 | Fine for body text |
| #3F5DB1 text on black | 3.41:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F3
oklch(88.5% 0.038 267.3)
-
Step 300
300
#ADC0ED
oklch(80.9% 0.067 267)
-
Step 400
400
#829EE4
oklch(70.6% 0.108 267)
-
Step 500
500
#6485DC
oklch(63.2% 0.137 266.8)
-
Step 600
600
#4B6DC9
oklch(55.6% 0.148 266.4)
-
Step 700
700 (this color)
#3F5DB1
oklch(50% 0.138 266.6)
-
Step 800
800
#324A8D
oklch(42.6% 0.115 266.7)
-
Step 900
900
#2C3F71
oklch(37.8% 0.089 266.5)
-
Step 950
950
#1A2542
oklch(27% 0.056 266.9)
#3F5DB1 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) | #3367B4 | 0.027 |
| Deuteranopia (no green cones) | #1D5DAF | 0.030 |
| Tritanopia (no blue cones) | #00707E | 0.116 |
| Achromatopsia (no color) | #616161 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F5DB1
#3F5DB1
oklch(50% 0.138 266.6)
- #7C5E00
#7C5E00
oklch(49.9% 0.102 86.8)
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 #3F5DB1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.038
- French Blue #436BAD ΔE 0.041
- Dusky Blue #475F94 ΔE 0.049
- Denim Blue #3B5B92 ΔE 0.050
- Iris #6258C4 ΔE 0.057
- Twilight #4E518B ΔE 0.065
- Denim #3B638C ΔE 0.066
- Flat Blue #3C73A8 ΔE 0.066
Use #3F5DB1 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.