#3F697F
Closest named color: Slate (#516572). oklch(49.9% 0.059 232.5), rgb(63, 105, 127).
Aa
White text reads best on this color (5.93:1).
About this color
#3F697F is a medium-dark, muted blue. In OKLCH its lightness is 50%, its chroma 0.059 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.027 away. White text reads best on it, at 5.93:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.53:1 |
| White text | 5.93:1 |
Values
| HEX | #3F697F |
| RGB | rgb(63, 105, 127) |
| HSL | hsl(201, 34%, 37%) |
| OKLCH | oklch(49.9% 0.059 232.5) |
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 #3F697F | 5.93:1 | AA | Lc -84.8 | Fine for body text |
| Black text on #3F697F | 3.53:1 | AA large text | Lc 24.5 | Dividers and decoration only |
| #3F697F text on white | 5.93:1 | AA | Lc 79.6 | Fine for body text |
| #3F697F text on black | 3.53:1 | AA large text | Lc -22.2 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#CFDBE2
oklch(88.4% 0.016 233)
-
Step 300
300
#AFC4D0
oklch(80.8% 0.029 232.8)
-
Step 400
400
#85A6B8
oklch(70.7% 0.045 232.1)
-
Step 500
500
#6690A7
oklch(63.1% 0.058 232.8)
-
Step 600
600
#4C7A92
oklch(55.6% 0.063 232.2)
-
Step 700
700 (this color)
#3F697F
oklch(49.9% 0.059 232.5)
-
Step 800
800
#335465
oklch(42.8% 0.048 231.9)
-
Step 900
900
#2D4552
oklch(37.6% 0.037 232.7)
-
Step 950
950
#1A2930
oklch(27.1% 0.024 228.7)
#3F697F 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) | #5E6880 | 0.039 |
| Deuteranopia (no green cones) | #55617F | 0.034 |
| Tritanopia (no blue cones) | #1F6F70 | 0.044 |
| Achromatopsia (no color) | #646464 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F697F
#3F697F
oklch(49.9% 0.059 232.5)
- #7E5A43
#7E5A43
oklch(50% 0.059 53.5)
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 #3F697F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.027
- Denim #3B638C ΔE 0.032
- Metallic Blue #4F738E ΔE 0.041
- YInMn Blue #415A77 ΔE 0.044
- Sea Blue #047495 ΔE 0.047
- Muted Blue #3B719F ΔE 0.051
- Peacock Blue #016795 ΔE 0.051
- Ocean Blue #03719C ΔE 0.052
Use #3F697F 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.