#3F778B
Closest named color: Metallic Blue (#4F738E). oklch(53.9% 0.067 223.5), rgb(63, 119, 139).
Aa
White text reads best on this color (4.97:1).
About this color
#3F778B is a medium-dark, muted teal or cyan. In OKLCH its lightness is 54%, its chroma 0.067 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.021 away. White text reads best on it, at 4.97:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (54%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 4.22:1 |
| White text | 4.97:1 |
Values
| HEX | #3F778B |
| RGB | rgb(63, 119, 139) |
| HSL | hsl(196, 38%, 40%) |
| OKLCH | oklch(53.9% 0.067 223.5) |
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 #3F778B | 4.97:1 | AA | Lc -79.7 | Fine for body text |
| Black text on #3F778B | 4.22:1 | AA large text | Lc 29.8 | Dividers and decoration only |
| #3F778B text on white | 4.97:1 | AA | Lc 74.3 | Content text, not long reading |
| #3F778B text on black | 4.22:1 | AA large text | Lc -27.4 | 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 600.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBEE
oklch(93.6% 0.009 225.1)
-
Step 200
200
#CEDCE1
oklch(88.5% 0.017 221.1)
-
Step 300
300
#ADC5CF
oklch(80.9% 0.03 224.8)
-
Step 400
400
#80A8B7
oklch(70.8% 0.049 222.9)
-
Step 500
500
#5F92A5
oklch(63.1% 0.061 223.5)
-
Step 600
600 (this color)
#3F778B
oklch(53.9% 0.067 223.5)
-
Step 700
700
#35687B
oklch(49% 0.063 224.7)
-
Step 800
800
#2D5564
oklch(42.7% 0.051 224.5)
-
Step 900
900
#294651
oklch(37.6% 0.04 224.2)
-
Step 950
950
#182930
oklch(26.9% 0.026 225.8)
#3F778B 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) | #6C758C | 0.054 |
| Deuteranopia (no green cones) | #606C8B | 0.047 |
| Tritanopia (no blue cones) | #077D7D | 0.045 |
| Achromatopsia (no color) | #707070 | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F778B
#3F778B
oklch(53.9% 0.067 223.5)
- #90624F
#90624F
oklch(54% 0.067 43.3)
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 #3F778B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.021
- Cerulean #457B9D ΔE 0.030
- Ocean #017B92 ΔE 0.031
- Dull Blue #49759C ΔE 0.032
- Stormy Blue #507B9C ΔE 0.034
- Sea Blue #047495 ΔE 0.037
- Deep Aqua #08787F ΔE 0.039
- Muted Blue #3B719F ΔE 0.041
Use #3F778B 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.