#3F6798
Closest named color: Denim (#3B638C). oklch(50.7% 0.091 254.3), rgb(63, 103, 152).
Aa
White text reads best on this color (5.82:1).
About this color
#3F6798 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.091 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.022 away. White text reads best on it, at 5.82:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.60:1 |
| White text | 5.82:1 |
Values
| HEX | #3F6798 |
| RGB | rgb(63, 103, 152) |
| HSL | hsl(213, 41%, 42%) |
| OKLCH | oklch(50.7% 0.091 254.3) |
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 #3F6798 | 5.82:1 | AA | Lc -84.2 | Fine for body text |
| Black text on #3F6798 | 3.60:1 | AA large text | Lc 25.1 | Dividers and decoration only |
| #3F6798 text on white | 5.82:1 | AA | Lc 79.0 | Fine for body text |
| #3F6798 text on black | 3.60:1 | AA large text | Lc -22.8 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EAF2
oklch(93.5% 0.013 255.5)
-
Step 200
200
#CEDAE9
oklch(88.4% 0.024 254)
-
Step 300
300
#AEC3DD
oklch(81% 0.043 253.8)
-
Step 400
400
#83A3CC
oklch(70.7% 0.07 254.8)
-
Step 500
500
#638CBF
oklch(63.1% 0.09 254.4)
-
Step 600
600
#4975AB
oklch(55.5% 0.098 254.3)
-
Step 700
700 (this color)
#3F6798
oklch(50.7% 0.091 254.3)
-
Step 800
800
#315077
oklch(42.6% 0.075 254.8)
-
Step 900
900
#2B4360
oklch(37.7% 0.058 253.8)
-
Step 950
950
#1A2738
oklch(26.9% 0.037 255.4)
#3F6798 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) | #536A9A | 0.027 |
| Deuteranopia (no green cones) | #476197 | 0.018 |
| Tritanopia (no blue cones) | #007278 | 0.079 |
| Achromatopsia (no color) | #656565 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F6798
#3F6798
oklch(50.7% 0.091 254.3)
- #845D21
#845D21
oklch(50.8% 0.091 74.4)
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 #3F6798, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.022
- Dusky Blue #475F94 ΔE 0.023
- Muted Blue #3B719F ΔE 0.029
- French Blue #436BAD ΔE 0.034
- Denim Blue #3B5B92 ΔE 0.036
- Peacock Blue #016795 ΔE 0.038
- Flat Blue #3C73A8 ΔE 0.038
- Ocean Blue #03719C ΔE 0.040
Use #3F6798 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.