#3F689E
Closest named color: French Blue (#436BAD). oklch(51.2% 0.098 255.8), rgb(63, 104, 158).
Aa
White text reads best on this color (5.69:1).
About this color
#3F689E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.098 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.025 away. White text reads best on it, at 5.69:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.68:1 |
| White text | 5.69:1 |
Values
| HEX | #3F689E |
| RGB | rgb(63, 104, 158) |
| HSL | hsl(214, 43%, 43%) |
| OKLCH | oklch(51.2% 0.098 255.8) |
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 #3F689E | 5.69:1 | AA | Lc -83.6 | Fine for body text |
| Black text on #3F689E | 3.68:1 | AA large text | Lc 25.7 | Dividers and decoration only |
| #3F689E text on white | 5.69:1 | AA | Lc 78.3 | Fine for body text |
| #3F689E text on black | 3.68:1 | AA large text | Lc -23.4 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CEDAEB
oklch(88.4% 0.027 257)
-
Step 300
300
#ADC3E0
oklch(81% 0.048 255.4)
-
Step 400
400
#81A3D0
oklch(70.7% 0.076 255.6)
-
Step 500
500
#618BC3
oklch(62.9% 0.097 255.9)
-
Step 600
600
#4875B0
oklch(55.7% 0.105 255.7)
-
Step 700
700 (this color)
#3F689E
oklch(51.2% 0.098 255.8)
-
Step 800
800
#30507B
oklch(42.8% 0.081 256.2)
-
Step 900
900
#2A4363
oklch(37.8% 0.063 255.1)
-
Step 950
950
#19273A
oklch(27% 0.041 256.3)
#3F689E 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) | #516BA0 | 0.024 |
| Deuteranopia (no green cones) | #45629D | 0.017 |
| Tritanopia (no blue cones) | #00747C | 0.083 |
| Achromatopsia (no color) | #676767 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F689E
#3F689E
oklch(51.2% 0.098 255.8)
- #875E18
#875E18
oklch(51.3% 0.098 75.7)
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 #3F689E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.025
- Muted Blue #3B719F ΔE 0.026
- Dusky Blue #475F94 ΔE 0.027
- Denim #3B638C ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.032
- Mid Blue #276AB3 ΔE 0.036
- Denim Blue #3B5B92 ΔE 0.040
- Ocean Blue #03719C ΔE 0.040
Use #3F689E 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.