#3F699E
Closest named color: Muted Blue (#3B719F). oklch(51.5% 0.097 255), rgb(63, 105, 158).
Aa
White text reads best on this color (5.63:1).
About this color
#3F699E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.097 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.023 away. White text reads best on it, at 5.63:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 3.72:1 |
| White text | 5.63:1 |
Values
| HEX | #3F699E |
| RGB | rgb(63, 105, 158) |
| HSL | hsl(213, 43%, 43%) |
| OKLCH | oklch(51.5% 0.097 255) |
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 #3F699E | 5.63:1 | AA | Lc -83.3 | Fine for body text |
| Black text on #3F699E | 3.72:1 | AA large text | Lc 26.0 | Dividers and decoration only |
| #3F699E text on white | 5.63:1 | AA | Lc 78.0 | Fine for body text |
| #3F699E text on black | 3.72:1 | AA large text | Lc -23.8 | 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
#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
#ADC3DF
oklch(81% 0.046 254.5)
-
Step 400
400
#81A3CF
oklch(70.7% 0.075 255.1)
-
Step 500
500
#618CC3
oklch(63.2% 0.096 255)
-
Step 600
600
#4775AF
oklch(55.6% 0.104 255)
-
Step 700
700 (this color)
#3F699E
oklch(51.5% 0.097 255)
-
Step 800
800
#2F507A
oklch(42.6% 0.08 255.1)
-
Step 900
900
#2A4362
oklch(37.8% 0.062 254.4)
-
Step 950
950
#19273A
oklch(27% 0.041 256.3)
#3F699E 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) | #536CA0 | 0.026 |
| Deuteranopia (no green cones) | #46639D | 0.018 |
| Tritanopia (no blue cones) | #00757C | 0.082 |
| Achromatopsia (no color) | #676767 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F699E
#3F699E
oklch(51.5% 0.097 255)
- #885E1B
#885E1B
oklch(51.5% 0.097 74.3)
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 #3F699E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.023
- French Blue #436BAD ΔE 0.024
- Flat Blue #3C73A8 ΔE 0.030
- Dusky Blue #475F94 ΔE 0.030
- Denim #3B638C ΔE 0.032
- Mid Blue #276AB3 ΔE 0.037
- Ocean Blue #03719C ΔE 0.039
- Dull Blue #49759C ΔE 0.039
Use #3F699E 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.