#3F7288
Closest named color: Metallic Blue (#4F738E). oklch(52.5% 0.065 227.9), rgb(63, 114, 136).
Aa
White text reads best on this color (5.28:1).
About this color
#3F7288 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 53%, its chroma 0.065 and its hue 228°. 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 5.28:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (53%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.97:1 |
| White text | 5.28:1 |
Values
| HEX | #3F7288 |
| RGB | rgb(63, 114, 136) |
| HSL | hsl(198, 37%, 39%) |
| OKLCH | oklch(52.5% 0.065 227.9) |
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 #3F7288 | 5.28:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #3F7288 | 3.97:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #3F7288 text on white | 5.28:1 | AA | Lc 76.1 | Fine for body text |
| #3F7288 text on black | 3.97:1 | AA large text | Lc -25.6 | 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
#CFDBE2
oklch(88.4% 0.016 233)
-
Step 300
300
#AEC5D0
oklch(81% 0.029 228.2)
-
Step 400
400
#83A7B8
oklch(70.8% 0.047 228.4)
-
Step 500
500
#6291A6
oklch(63.1% 0.06 227.7)
-
Step 600
600 (this color)
#3F7288
oklch(52.5% 0.065 227.9)
-
Step 700
700
#39687C
oklch(49.2% 0.06 227.6)
-
Step 800
800
#305565
oklch(42.9% 0.05 227.7)
-
Step 900
900
#2B4652
oklch(37.8% 0.039 227.9)
-
Step 950
950
#192930
oklch(27% 0.025 227.2)
#3F7288 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) | #677089 | 0.049 |
| Deuteranopia (no green cones) | #5C6888 | 0.043 |
| Tritanopia (no blue cones) | #117879 | 0.046 |
| Achromatopsia (no color) | #6C6C6C | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F7288
#3F7288
oklch(52.5% 0.065 227.9)
- #8A5F49
#8A5F49
oklch(52.6% 0.065 47.9)
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 #3F7288, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.021
- Dull Blue #49759C ΔE 0.034
- Sea Blue #047495 ΔE 0.035
- Ocean #017B92 ΔE 0.037
- Muted Blue #3B719F ΔE 0.038
- Cerulean #457B9D ΔE 0.039
- Deep Aqua #08787F ΔE 0.041
- Stormy Blue #507B9C ΔE 0.043
Use #3F7288 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.